Consulta: subjectFacets:"Chlorophyll"
Registros recuperados: 114
Data/hora: 06/06/2024 02:28:28

Efecto de la citocinina bap en la senescencia foliar natural de Triticum aestivum var. Temporalera; Fotosíntesis, Rubisco y Tranpiración
Provedor de dados: 32
Autores: Martínez Gutiérrez, Ricardo.
La senescencia foliar natural de Triticum aestivum var. Temporalera, fue retrazada con aspersiones de 6-bencilaminopurina (BAP) 0.1 mM, cada tres días durante 20 días en invernadero. La senescencia de las hojas control (agua) estuvo caracterizada por la perdida de clorofilas (88%) y proteínas solubles (96%), así como por una reducción de la población de plastidios (52.5%) a los 41 días después de la siembra (DDS). La concentración de xantofilas y carotenoides se redujo en un 53.9%, la tasa de asimilación de CO2 disminuyó en un 94%, la cual se correlaciono significativamente con la degradación de la LSU de Rubisco. El potencial hídrico ΨA disminuyó de -0.38 MPa a -0.62 MPa durante la senescencia; el potencial osmótico (Ψs) se incrementó de -1.3 MPa a -1.1...
Tipo: Tesis
Palavras-chave: Población de plastidios; Clorofila; LSU de Rubisco; ΨA; ΨS; Ψt; Gs1; Tasa de asimilación de CO2; Maestría; Botánica; Plastids population; Chlorophyll; LSU of Rubisco; ΨW; Rate of CO2 assimilation.
Ano: 2007
URL: http://hdl.handle.net/10521/1588

Respuestas agronómicas y fisiológicas del tulipán (Tulipa gesneriana L.) al lantano.
Provedor de dados: 32
Autores: Ramírez Martínez, Maribel.
En esta investigación se presentan resultados de tres experimentos para evaluar el efecto del suministro de lantano (La) en variables agronómicas y fisiológicas de tulipán en solución nutritiva. En el experimento uno se evaluó el efecto del suministro de La (5, 10, 20, 30 y 40 µM) y dos fuentes [LaCl3 y La(NO3)3] durante el ciclo de cultivo de tulipán var. Ile de France, sobre la tasa de crecimiento absoluto (TCA), tasa de crecimiento relativo (TCR), acumulación y distribución de materia seca y acumulación nutrimental. Por efecto de fuente de La no se observaron diferencias significativas. Se observó que la concentración 20 µM La3 aceleró la emergencia, expansión de hoja y floración en comparación con el testigo; por el contrario, concentraciones mayores...
Palavras-chave: Fenología; Materia seca; Concentración; Altura de planta; Diámetro; Clorofilas; Proteínas; Azúcares; Vida en florero; Variedad; Solución preservadora; Phenology; Dry matter; Concentration; Plant height; Diameter; Chlorophyll; Proteins; Sugars; Vase life; Preservation solution; Doctorado; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/380

Clorosis en hojas y tallo de Alstroemeria sp. en postcosecha.
Provedor de dados: 32
Autores: Rodríguez López, Carmen.
La presente investigación se llevó a cabo en condiciones de invernadero del Campus Montecillo, con rizomas de Alstroemeria cv. “Olga”, bajo sistema hidropónico, con la solución universal de Steiner hasta la cosecha. Consistió en dos etapas: fase de invernadero y vida de florero. En fase de invernadero se aplicaron tratamientos mediante fertilización foliar al cultivo bajo un diseño experimental completamente al azar con cinco repeticiones. Se evaluaron nueve dosis de fertilización obtenidas de un estudio previo. Las fuentes de fertilizantes utilizadas fueron: Ca(NO3)2, MgSO4- y FeEDTA. Las variables evaluadas fueron: clorofila, longitud de hoja, diámetro del tallo, número de hojas por tallo y longitud de tallos. La investigación en la fase de vida de...
Palavras-chave: Alstroemeria sp.; Clorofila; Fertilización foliar; Vida de florero; Chlorophyll; Foliar fertilization; Vase life; Edafología; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2389

Enverdecimiento de la espata de Spathiphyllum wallisii Regel
Provedor de dados: 32
Autores: González Aguilar, Susana.
Spathiphyllum spp. es conocida comúnmente como cuna de moisés, se utiliza como  planta ornamental, presenta una hoja modificada (espata), de color blanco, y conforme  madura enverdece. Este fenómeno típico de algunas Aráceas es poco conocido. En el  presente trabajo se analizaron algunos parámetros que intervienen en el enverdecimiento.  Para clasificar el enverdecimiento la clorofila se midió con un medidor portátil (SPAD-meter  50), se delimitaron tres etapas en unidades relativas “SPAD”; E1 con 5 a 10, E2 de 15 a 20 y  E3 de 25 a 30, como referencia se usaron espatas blancas (B) y hojas del follaje (V) con un  rango de 35 a 46 unidades relativas. El contenido de clorofila total en las hojas del follaje  (2.99 gChlmg-1PF) fue el doble que en E3...
Tipo: Tesis
Palavras-chave: Clorofila; Enverdecimiento; Fluorescencia; LSU de Rubisco; Maestría; Botánica; Chlorophyll; Greening; Fluorescence; LSU of Rubisco.
Ano: 2009
URL: http://hdl.handle.net/10521/1274

Respuestas agronómicas y fisiológicas del tulipán (Tulipa gesneriana L.) al lantano.
Provedor de dados: 32
Autores: Ramírez Martínez, Maribel.
En esta investigación se presentan resultados de tres experimentos para evaluar el efecto del suministro de lantano (La) en variables agronómicas y fisiológicas de tulipán en solución nutritiva. En el experimento uno se evaluó el efecto del suministro de La (5, 10, 20, 30 y 40 µM) y dos fuentes [LaCl3 y La(NO3)3] durante el ciclo de cultivo de tulipán var. Ile de France, sobre la tasa de crecimiento absoluto (TCA), tasa de crecimiento relativo (TCR), acumulación y distribución de materia seca y acumulación nutrimental. Por efecto de fuente de La no se observaron diferencias significativas. Se observó que la concentración 20 µM La3 aceleró la emergencia, expansión de hoja y floración en comparación con el testigo; por el contrario, concentraciones mayores...
Palavras-chave: Fenología; Materia seca; Concentración; Altura de planta; Diámetro; Clorofilas; Proteínas; Azúcares; Vida en florero; Variedad; Solución preservadora; Phenology; Dry matter; Concentration; Plant height; Diameter; Chlorophyll; Proteins; Sugars; Vase life; Preservation solution; Doctorado; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/380

EFFECT OF DRYING METHODS ON CRAMBE (Crambe abyssinica HOCHST) SEED COAT PIGMENTATION AND ON OIL AND BIODIESEL QUALITY
Provedor de dados: 70
Autores: Silva,Magnun A. P. Da; Biaggioni,Marco A. M.; Sperotto,Felipe C. S.; Macedo,Ana C.; Brandão,Fernando J. B.
ABSTRACT The objective of this study was to evaluate the effect of different drying methods on seed coat pigmentation and quality of oil and biodiesel extracted from crambe. The experimental design was completely randomized with five treatments and four replications, totaling 20 plots. The treatments consisted of drying with heated air, natural air, ground, in the shade and in the plant. Physical and chemical analyzes were performed to verify the quality of grain, oil and biodiesel. The largest amounts of chlorophyll a and b and green beans and the lowest oil content were found in artificial drying with heated air. It was concluded that the drying in the plant presented grains and oil of better quality, but do not interfering in the quality of biodiesel,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Biofuels; Oilseed.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601167

EFFECT OF THE MIST MICRO-SPRAY TIME ON PHOTOSYNTHETIC SPATIAL HETEROGENEITY OF GRAPE CANOPY
Provedor de dados: 70
Autores: Zheng,Ming; Bai,Yungang; Zhang,Jianghui; Liu,Hongbo; Ding,Ping.
ABSTRACT In grape, high temperatures and low humidity prolong midday depression of foliar photosynthesis and dramatically reduce fruit yield. In this study, we explored the effects of various mist micro-spray treatments on grape photosynthesis at a test site in Shanshan County (N, 42.91°; E, 90.30°), Turpan, Xinjiang, China. We tested four different mist micro-spray durations including 1 h (WP1), 2 h (WP2), 3 h (WP3), and 0 h (CK). WP1, WP2, and WP3 affected canopy air temperature and humidity for 5 h, 7 h, and 9 h, respectively. At 12:30, WP1, WP2, and WP3 had the strongest cooling effect and altered temperature by −5.12 °C, −5.09 °C, and −5.17 °C respectively. The relative chlorophyll content was higher in the upper than the lower canopy leaves. There...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Air temperature; Chlorophyll; Photosynthesis; Stomatal conductance; Transpiration rate.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000100039

Evaluation of different oxygen, carbon dioxide and nitrogen combinations employed to extend the shelf life of fresh-cut collard greens
Provedor de dados: 75
Autores: Moretti,Celso L.; Araújo,Alessandra L.; Mattos,Leonora M.
Collard greens (Brassica oleracea var. acephala) "Manteiga" were harvested in commercial fields in Brasilia, Brazil, aiming to evaluate different oxygen, carbon dioxide and nitrogen combinations to extend the shelf life of the fresh-cut product. After harvest, leaves were taken to the postharvest laboratory, selected for external blemishes and minimally processed (3 mm thick) inside a cold room (13±2°C). After processing, fresh-cut collard greens were stored under two controlled atmosphere (CA) conditions (3% O2, 4% CO2; 5% O2, 5% CO2/balance N2), and normal air (control), at 5°C (95±2% RH), for six days. Daily, minimally processed collard greens were evaluated for total vitamin C, total chlorophyll, total soluble solids content, and titratable acidity....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var; Acephala; Brix; Chlorophyll; Controlled atmosphere; Quality; Postharvest; Vitamin C.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362003000400021

Physiological differences of ‘Crocantela’ lettuce cultivated in conventional and hydroponic systems
Provedor de dados: 75
Autores: Souza,Priscila F de; Borghezan,Marcelo; Zappelini,Julia; Carvalho,Lara R de; Ree,Joseph; Barcelos-Oliveira,Jorge L; Pescador,Rosete.
ABSTRACT Conventional soil and hydroponic growing systems have inherent differences in water and nutritional availability. These differences may affect plant physiological development and biochemistry. The objective of this study was to evaluate lettuce (Lactica sativa) cv. ‘Crocantela’development in either a hydroponic system or in soil through analyses of vegetative growth; chlorophyll abundance; and sugar and starch content. We evaluated the dry mass (DM), fresh mass (FM), number of leaves (LN), stomatal density and contents of chlorophyll, carotenoids, sugars and starch. Due to the improved nutritional conditions, especially in relation to macronutrients, plants grown in hydroponic system presented significant differences in chlorophyll a (0.4481...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Biomass; Chlorophyll; Starch; Stomatal density.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000100101

Hydrocooling on postharvest conservation of butter lettuce
Provedor de dados: 75
Autores: França,Christiane FM; Ribeiro,Welington S; Silva,Fernanda C; Costa,Lucas C; Rêgo,Elizanilda R; Finger,Fernando L.
Lettuce is a vegetable highly susceptible to water loss, which reduces its shelf life and increases the final cost to the consumer. The aim of this study was to evaluate the effects of hydrocooling on the postharvest shelf life of butter lettuce 'Vitória de Santo Antão'. The lettuce heads, after selection, were subjected to the following treatments: T1= hydrocooling followed by storage at 5°C in the cold chamber; T2= storage in the cold chamber at 5°C without hydrocooling; T3= hydrocooling followed by storage at 22°C and T4= storage at 22°C without hydrocooling. We determined the shelf life, leaves mass loss, chlorophyll content, relative water content, total soluble sugars content, reducing sugars, non-reducing sugars and starch. The data were analyzed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Cooling; Shelf life; Chlorophyll; Carbohydrates.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362015000300383

Effect of salicylic acid on pre-transplant acclimatization of native tomato populations
Provedor de dados: 75
Autores: Poot-Poot,Wilberth A; Delgado-Martínez,Rafael; Castro-Nava,Sergio; Segura-Martínez,Ma Teresa; Carreón-Pérez,Alejandro; Hernández-Martínez,Jesús Guillermo.
ABSTRACT The aim of this study was to evaluate the effect of salicylic acid (SA) application on pre-transplant acclimatization of native populations of tomato. SA is a growth regulator that modifies plant growth and development by inducing changes in cell processes, physiology and morphology. Five populations of native tomato were sown in polystyrene trays. Peat moss was used as substrate and plants were maintained at field capacity continuously. After emergence, seedlings were applied during three weeks with different concentration of SA (0.0, 0.01, 0.1, 0.5 and 1.0 μM). A completely random experimental design was used with five replications per treatment. The growth parameters evaluated were height, stem diameter, number of leaves, hypocotyl length,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Stress tolerance; Chlorophyll; Carotenoids; Growth regulators.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000400480

Региональная модель для расчёта первичной продукции Чёрного моря с использованием данных спутникового сканера цвета SeaWiFS.
Provedor de dados: 13
Autores: Финенко, З. З.; Суслин, В. В.; Чурилова, Т. Я.
Разработана и применена малопараметрическая региональная модель для оценки первичной продукции Чёрного моря с использованием данных спутникового сканера цвета (SeaWiFS) за 1998 – 2004 гг. В модели использованы результаты исследований фотосинтетических характеристик черноморского фитопланктона и вертикального распределения хлорофилла, послужившие основой для обоснования и создания регионального алгоритма. Использованная  параметризация учитывает совместное действие плотности светового потока, температуры и концентрации хлорофилла  в поверхностном слое на фотосинтетические параметры кривой фотосинтез–свет и их изменение с глубиной. Полученные закономерности соединены с данными спутниковых измерений для оценки пространственно-временной вариабельности...
Tipo: Journal Contribution
Palavras-chave: Чёрное море; Модель; Спутник; Первичная продукция; Хлорофилл; Свет; Фитопланктон; Black Sea; Model; Satellite; Primary production; Chlorophyll; Light; Phytoplankton; Чорне море; Модель; Супутник; Первинна продукція; Хлорофіл; Світло; Фітопланктон.
Ano: 2009
URL: http://repository.ibss.org.ua/dspace/handle/99011/844

Продукционные характеристики роста и биосинтеза квазинепрерывной культуры зелёной микроводоросли Dunaliella salina Teod.
Provedor de dados: 13
Autores: Лелеков, А. С.; Гудвилович, И. Н.
Исследована динамика плотности, содержания хлорофилла а и белка квазинепрерывной культуры Dunaliella salina. На этапе накопительной культуры рассчитаны продукционные характеристики дуналиеллы по биомассе, хлорофиллу а и белку, с помощью которых построены прогностические кривые относительного содержания хлорофилла а и белка. Показано, что для получения максимальной продуктивности по биомассе клеток, белку и фотосинтетическим пигментам в квазинепрерывной культуре D. salina необходимо осуществлять обмен среды около 30 % от объёма. http://biotex.ibss.org.ua/
Tipo: Journal Contribution
Palavras-chave: Dunaliella salina; Продуктивность; Математическая модель; Хлорофилл; Белок; Productivity; Mathematical model; Chlorophyll; Protein.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1750

Математическая модель  светозависимого содержания пигментов  в клетках микроводорослей для стационарного динамического равновесия хемостатной культуры
Provedor de dados: 13
Autores: Боровков, А. Б.
Разработана математическая модель светозависимого содержания пигментов в клетках микроводорослей в хемостате. В основу модели положено представление о способности пигментов поглощать ограниченное число квантов света, после чего они разрушаются. Как следствие, относительное содержание пигментов в клетках микроводорослей является суммой процессов синтеза, фотодеструкции и восстановления. http://biotex.ibss.org.ua/
Tipo: Journal Contribution
Palavras-chave: Математическая модель; Хлорофилл; Хемостат; Микроводоросли; Mathematical model; Chlorophyll; Chemostat; Microalgae.
Ano: 2010
URL: http://repository.ibss.org.ua/dspace/handle/99011/1743

In-Situ Variability of DOM in Relation with Biogeochemical and Physical Parameters in December 2017 in Laucala Bay (Fiji Islands) after a Strong Rain Event
Provedor de dados: 5
Autores: Koliyavu, Timoci; Martias, Chloe; Singh, Awnesh; Mounier, Stéphane; Gérard, Philippe; Dupouy, Cecile.
Heavy rain events alter the biogeochemical outflows, affects water quality and ecosystem health within the coastal waters of small Pacific Islands. We characterized snapshots of the optical fingerprints of dissolved organic matter (DOM) sources together with the select nutrients, biogeochemical and physical variables for 10 stations in December 2017 in Laucala Bay, Fiji Islands. DOM absorption coefficients and fluorescence components were determined via spectrofluorometry and Parallel Factor Analysis identifying four components: Type M, two terrestrial (humic, fulvic) components, and a protein component linked to marine biological activity. Associations of DOM together with climate variables and the other tested variables were determined via principal...
Tipo: Text
Palavras-chave: DOM absorption; Fluorescence; Biogeochemistry; PARAFAC; EEM spectra; Autochthonous; Allochthonous; Chlorophyll; CDOM; FDOM.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00682/79372/81889.pdf

Maximizing microalgae productivity in a light-limited chemostat
Provedor de dados: 5
Autores: Martinez, Carlos; Bernard, Olivier; Mairet, Francis.
Light supply is one of the most important parameters to be considered for enhancing microalgae growth in photobioreactors (PBR) with artificial light. However, most of the mathematical works do not consider incident light as a parameter to be optimized. In this work based on a simple model of light-limited growth, we determine optimal values for the dilution rate and the incident light intensity in order to maximize the steady-state microalgal surface productivity in a continuous culture. We also show that in optimal conditions there is a minimal initial microalgal concentration (and we give a simple expression to determine it) to guarantee the persistence of the population. Finally, in the context of enhancing microalgae productivity by reducing light...
Tipo: Text
Palavras-chave: Dynamics and control; Industrial biotechnology; Photoinhibition; Biomass productivity; Microalgae; Photoacclimation; Chlorophyll.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00439/55091/56653.pdf

Impact of eddies on surface chlorophyll in the South Indian Ocean
Provedor de dados: 5
Autores: Dufois, Francois; Hardman-mountford, Nick J.; Greenwood, Jim; Richardson, Anthony J.; Feng, Ming; Herbette, Steven; Matear, Richard.
A unique feature of the subtropical South Indian Ocean is the existence of anticyclonic eddies that have higher chlorophyll concentrations than cyclonic eddies. Off Western Australia, this anomalous behavior is related to the seeding of anticyclonic eddies with shelf water enriched in phytoplankton biomass and nutrients. Further off-shore, two mechanisms have been suggested to explain the eddy/chlorophyll relationship: (i) eddies originating from the Australian coast maintain their chlorophyll anomaly while propagating westward; and (ii) eddy-induced Ekman upwelling (downwelling) enhances (dampens) nutrient supply in anticyclonic (cyclonic) eddies. Here we describe the relationship between eddies and surface chlorophyll within the South Indian Ocean, and...
Tipo: Text
Palavras-chave: Eddies; Chlorophyll; Self-organizing map; Convective mixing; Eddy-induced Ekman pumping.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00233/34464/32862.pdf

Bio-Argo quality control manual for the Chlorophyll-A concentration
Provedor de dados: 5
Autores: Schmechtig, Catherine; Claustre, Herve; Poteau, Antoine; D'Ortenzio, Fabrizio.
This document is the bio-Argo quality control manual for Chlorophyll A concentration. It describes the method used in real-time to apply quality control flags to Chlorophyll A concentration calculated from specific sensors mounted on Argo profiling floats.
Tipo: Text
Palavras-chave: Argo; Physical oceanography; In-situ marine data; Profiling floats; Chlorophyll; Operational oceanography; Biogeochemistry.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00243/35385/60181.pdf

Chlorophyll profiles and the water column structure in the Gulf of California
Provedor de dados: 5
Autores: Hidalgo-gonzalez, Raquel M; Alvarez-borrego, Saul.
Remote sensors provide information on the photosynthetic pigment concentration for the upper 22% of the euphotic zone. To model primary production in the water column from satellite-derived photosynthetic pigments, estimates of the vertical distribution of pigment concentration are required. A Gaussian distribution function is used to represent the pigment vertical profile with four parameters. We used 268 chlorophyll concentration profiles from 1973 through 1993, to estimate these parameters. Cluster analysis of surface temperature was used to define the cool season as the period end of November-end of June, and the rest of the year is considered the warm season. Cluster analysis of surface temperature acid chlorophyll data grouped the stations into four...
Tipo: Text
Palavras-chave: Chlorophylle; Profil vertical; Golfe de Californie; Télédétection; Couche mélangée; Chlorophyll; Vertical profiles; Gulf of California; Remote sensing; Mixed layer.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43367/42848.pdf

Suivi régional des nutriments sur le littoral Nord-Pas-De-Calais/Picardie Synthèse des résultats du suivi de 1992 à 1994
Provedor de dados: 5
Autores: Hitier, Benoist; Olivesi, Rene; Rybarczyk, Hervé; Delesmont, Régis; Morel, Marc; Loquet, Nicolas.
Nutrients levels of marine water along the North of France coastline are growing-up. They have a good chance to become a problem in the future. Since 1992, a network of three radial lines is sampled at regular interval to supervise on long term : 1. Parameters levels that show the environment quality (temperature, salinity, turbidity,total suspended matters, organic suspended matters, chlorophyll, phaeopigments, phytoplankton). 2. Nutrients concentrations ( ammonia, nitrite, nitrate, phosphate, silicate) that enrich the environment , and may be responsable of its deterioration. The report shows the results of the first three years survey. I t strikes a correlation between the tested parameters and takes stock of the present situation.
Tipo: Text
Palavras-chave: Suivi; Littoral; Nord-Pas de Calais; Picardie; Nutriments; Chlorophylle; Eutrophisation; Survey; Coastline; North of France; Picardie; Nutrients; Chlorophyll; Eutrophycation.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00082/19277/16872.pdf

Variability of Sea-Air Carbon Dioxide Flux in Autumn Across the Weddell Gyre and Offshore Dronning Maud Land in the Southern Ocean
Provedor de dados: 5
Autores: Ogundare, Margaret Ojone; Fransson, Agneta; Chierici, Melissa; Joubert, Warren R.; Roychoudhury, Alakendra N.
Sea surface fugacity of carbon dioxide (fCO2ssw) was measured across the Weddell gyre and the eastern sector in the Atlantic Southern Ocean in autumn. During the occupation between February and April 2019, the region of the study transect was a potential ocean CO2 sink. A net CO2 flux (FCO2) of −6.2 (± 8; sink) mmol m–2 d–1 was estimated for the entire study region, with the largest average CO2 sink of −10.0 (± 8) mmol m–2 d–1 in the partly ice-covered Astrid Ridge (AR) region near the coast at 68°S and −6.1 (± 8) mmol m–2d–1 was observed in the Maud Rise (MR) region. A CO2 sink was also observed south of 66°S in the Weddell Sea (WS). To assess the main drivers describing the variability of fCO2ssw, a correlation model using fCO2 and oxygen saturation was...
Tipo: Text
Palavras-chave: CO2 and biogeochemical drivers; Chlorophyll; Antarctic coast; Maud Rise; Astrid Ridge; Sea ice; Oxygen saturation.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00676/78854/81155.pdf

Study on the microalgal pigments extraction process: Performance of microwave assisted extraction
Provedor de dados: 5
Autores: Pasquet, Virginie; Cherouvrier, Jean-rene; Farhat, Firas; Thiery, Valerie; Piot, Jean-marie; Berard, Jean-baptiste; Kaas, Raymond; Serive, Benoit; Patrice, Thierry; Cadoret, Jean-paul; Picot, Laurent.
The performance of microwaves irradiation (MAE and VMAE) to extract pigments from two marine microalgae was compared to conventional processes (cold and hot soaking and ultrasound-assisted extraction). Pigments were quantified by RP-HPLC and extraction performance was assessed regarding rapidity, reproducibility and extraction yields. Scanning electron microscopy was used at all extraction steps to assess the impact of the process on microalgal cell integrity. Freeze-drying and pigments extraction preserved microalgae cell integrity (except sonication) and evoked agglutination in superposed cells layers. All processes performed on Dunaliella tertiolecta (chlorophyte) lead to rapid pigments extraction, and equivalent pigments extraction yields, the absence...
Tipo: Text
Palavras-chave: Pigments; Microalgae; Microwave; Extraction; Chlorophyll; Fucoxanthin; Carotene; MAE; VMAE.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00029/14059/11533.pdf

Evaluation of empirical and semi-analytical chlorophyll algorithms in the Ligurian and North Tyrrhenian Seas
Provedor de dados: 5
Autores: Lapucci, Chiara; Rella, Marina Ampolo; Brandini, Carlo; Ganzin, Nicolas; Gozzini, Bernardo; Maselli, Fabio; Massi, Luca; Nuccio, Caterina; Ortolani, Alberto; Trees, Charles.
The estimation of chlorophyll concentration in marine waters is fundamental for a number of scientific and practical purposes. Standard ocean color algorithms applicable to moderate resolution imaging spectroradiometer (MODIS) imagery, such as OC3M and MedOC3, are known to overestimate chlorophyll concentration ([CHL]) in Mediterranean oligotrophic waters. The performances of these algorithms are currently evaluated together with two relatively new algorithms, OC5 and SAM_LT, which make use of more of the spectral information of MODIS data. This evaluation exercise has been carried out using in situ data collected in the North Tyrrhenian and Ligurian Seas during three recent oceanographic campaigns. The four algorithms perform differently in Case 1 and...
Tipo: Text
Palavras-chave: Chlorophyll; Algorithm; Moderate resolution imaging spectroradiometer; Tyrrhenian Sea; Ligurian Sea.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00109/21991/19795.pdf

Oligotrophication and Metabolic Slowing-Down of a NW Mediterranean Coastal Ecosystem
Provedor de dados: 5
Autores: Agusti, Susana; Martinez-ayala, Juan; Regaudie-de-gioux, Aurore; Duarte, Carlos M.
Increased oligotrophication is expected for oligotrophic areas as a consequence of ocean warming, which reduces diffusive vertical nutrient supply due to strengthened stratification. Evidence of ocean oligotrophication has been, thus far, reported for the open ocean. Here we reported oligotrophication and associated changes in plankton community metabolism with warming in a pristine, oligotrophic Mediterranean coastal area (Cap Salines, Mallorca Island, Spain) during a 10 years time series. As a temperate area, there were seasonal patterns associated to changes in the broad temperature range (12.0.28.4.C), with a primary phytoplankton bloom in late winter and a secondary one in the fall. Community respiration (R) rates peaked during summers and showed...
Tipo: Text
Palavras-chave: Oligotrophiocation; Mediterranean sea; Respiration; Net community production; Nutrients; Gross primary production; Warming; Chlorophyll.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00419/53091/54048.pdf

La baie de Seine : hydrologie, nutriments, chlorophille (1978-1994)
Provedor de dados: 5
Autores: Aminot, Alain; Guillaud, Jean-francois; Kerouel, Roger.
The data of hydrology, nutrients and chlorophyll obtained in the Bay of Seine over the period 1978-1994, from 14 océanographie cruises, are synthetised and illustrated by an atlas. The Bay is a typical example of a coastal area influenced by a large river. In winter, the nutrient input is drained off into the eastern Channel. In spring, nutrients are consumed intensively. Silicate is the first that drops to limiting levels. The spring bloom generally begins in the centre-east of the Bay. Chlorophyll a can reach up to 40-70 µg/l during the year, values typical of eutrophic coastal areas. Despite the regular increase of nitrogen inputs, the biomass (as chlorophyll) has not significantly changed over a fifteen year period.
Tipo: Text
Palavras-chave: Chlorophyll; Nutrients; Hydrology; Bay of Seine; Chlorophylle; Nutriments; Hydrologie; Baie de Seine.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/rapport-1428.pdf

Coupling physical and biogeochemical processes in the Rio de la Plata plume
Provedor de dados: 5
Autores: Huret, Martin; Dadou, Isabelle; Dumas, Franck; Lazure, Pascal; Garcon, Véronique.
A coupled three-dimensional physical-biogeochemical model was developed in order to simulate the ecological functioning of the Rio de la Plata estuary and plume. The biogeochemical model reproduces the nitrogen cycle between five compartments: dissolved inorganic nitrogen, phytoplankton, zooplankton, detritus and dissolved organic nitrogen. The coupling is tested in seasonal climatological configurations and for the particular year 1999. The circulation is forced with Parana and Uruguay rivers discharges, NCEP wind and tide. The biogeochemical model includes loads of inorganic and organic nitrogen from both rivers. The model reproduces the correct tidal amplitudes in the estuary, as well as the most outstanding features of the observed horizontal and...
Tipo: Text
Palavras-chave: Rio de la Plata; SeaWiFS; Primary production; Chlorophyll; River plumes; Biogeochemical modelling; Physical.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-334.pdf

Towards a better assessment of the ecological status of coastal waters using satellite-derived chlorophyll-a concentrations
Provedor de dados: 5
Autores: Gohin, Francis; Saulquin, Bertrand; Oger-jeanneret, Helene; Lozac' H, L; Lampert, Luis; Lefebvre, Alain; Riou, Philippe; Bruchon, F.
The application of the new Water Framework Directive (WFD) of the European Union will require a dense and frequent monitoring of chlorophyll-a near the coast. Not counting the transitional water bodies located in the vicinity of estuaries, not less than seventy four coastal water bodies have to be monitored along the coast of the French Atlantic continental shelf and the English Channel. All the available data have to be gathered to implement a comprehensive monitoring scheme. To this purpose, we evaluate the capacity of ocean colour imagery to complete the conventional in situ data set collected in coastal networks. Satellite-derived chlorophyll-a concentration is obtained by the application of a coastal Look-Up-Table to water-leaving radiance of the...
Tipo: Text
Palavras-chave: SeaWiFS; Coastal; Surveillance; Monitoring; Chlorophyll; Satellite.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4501.pdf

Phytoplankton dynamics in the southern New Caledonian lagoon during a southeast trade winds event
Provedor de dados: 5
Autores: Neveux, Jacques; Lefebvre, Jean-pierre; Le Gendre, Romain; Dupouy, Cecile; Gallois, Francis; Courties, Claude; Gerard, Philippe; Fernandez, Jean-michel; Ouillon, Sylvain.
During the Echolag cruise (13 February-8 March 2007), the effect of 16-30 knot trade winds on abundance, community structure and dynamics of phytoplankton was investigated in the southern part of the New Caledonian coral reefs and surrounding oceanic waters. In this area, the coral reefs form two horn-like structures (hereinafter referred to as 'horn reefs'), oriented south-east, and separated by a relatively deep valley. Three repeated samplings at one week intervals of a 32 station array showed that trade winds induce surface water cooling and significant enrichment of mid- and bottom waters above the reef shelf. This enrichment appeared as the result of a general rise of the oceanic thermocline and nitracline due to the combination of trade winds and...
Tipo: Text
Palavras-chave: Chlorophyll; Phycoerythrin; Flow cytometry; Phytoplankton; In vivo fluorescence; Growth rate; Trade winds; Lagoon; Internal wave; New Caledonia.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00013/12437/9258.pdf

Natural variability of bio-optical properties in Case 1 waters: attenuation and reflectance within the visible and near-UV spectral domains, as observed in South Pacific and Mediterranean waters
Provedor de dados: 5
Autores: Morel, A.; Claustre, H.; Antoine, D.; Gentili, B.
The optical properties of Case 1 waters have been empirically related to the chlorophyll concentration, [Chl], historically used as an index of the trophic state and of the abundance of the biological materials. The well-known natural variability around the mean statistical relationships is here examined by comparing the apparent optical properties (spectral downward irradiance attenuation and reflectance) as a function of [Chl] in two Case 1 environments, the Pacific and Mediterranean waters. These oceanic zones apparently represent two extremes of the possible bio-optical variability range around the mean. The systematic deviations, in both directions with respect to the average laws, mainly result from the differing contents in non-algal detrital...
Tipo: Text
Palavras-chave: Light absorption; Algal biomass; Ocean color; Chlorophyll; Sea; Phytoplankton; Model; Coefficients; Algorithms.
Ano: 2007
URL: https://archimer.ifremer.fr/doc/00209/32012/30549.pdf

Essai de mise en évidence in situ de paramètres biotiques et abiotiques de l'eau et de l'interface eau-sédiment intervenant dans la production de l'huître creuse Crassostrea gigas
Provedor de dados: 5
Autores: Heral, Maurice; Deslous-paoli, Jean-marc; Razet, Daniel; Prou, Jean.
The flesh production of oysters is mainly related to concentrations of dissolved carbon and free amino acids. The younger oysters are dependent on concentrations of pheopigments while the production of the older ones is related to chlorophyll a values of the water-sediment interface. Shell production depends mainly on temperature, but also on the amount of food available: concentrations of dissolved carbon for the younger oysters and values in chlorophyll a of the interface for the older ones.
Tipo: Text
Palavras-chave: Dissolved matter; Pheopigments; Chlorophyll; Marenne Oleron estuary; Crassostrea gigas; Trophic relations; Substances dissoutes; Phéopigments; Chlorophylle a; Estuaire de Marennes Oléron; Crassostrea gigas; Relations trophiques.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/publication-2932.pdf

Satellite-derived parameters for biological modelling in coastal waters: Illustration over the eastern continental shelf of the Bay of Biscay
Provedor de dados: 5
Autores: Gohin, Francis; Loyer, S; Lunven, Michel; Labry, Claire; Froidefond, J; Delmas, Daniel; Huret, Martin; Herbland, Alain.
In biological modelling of the coastal phytoplankton dynamics, the light attenuation coefficient is often expressed as a function of the concentrations of chlorophyll and mineral suspended particulate matter (SPM). In order to estimate the relationship between these parameters over the continental shelf of the northern Bay of Biscay, a set of in situ data has been gathered for the period 1998-2003 when SeaWiFS imagery is available. These data comprise surface measurements of the concentrations of total SPM, chlorophyll, and irradiance profiles from which is derived the attenuation coefficient of the photosynthetically available radiation, K-PAR. The performance of the IFREMER look-up table used to retrieve the chlorophyll concentration from the SeaWiFS...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Sediment; Chlorophyll; Ocean color.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1172.pdf

The Asi River's Estimated Nutrient Load and Effects on the Eastern Mediterranean
Provedor de dados: 5
Autores: Kilic, Ece; Akpinar, Anil; Yucel, Nebil.
Rivers are primary receiving environments for agricultural runoff and for domestic and industrial discharges. Rivers assimilate and treat incoming pollution load until self-purification capacity is reached. The remaining pollution load and natural nutrients are carried to and discharged into the sea causing variations in the receiving area's nutrient concentration. This study evaluated nutrient loads and effects of the Asi River on the northeastern Mediterranean Sea. Monitoring data from 2006 to 2014 from the State of Hydraulic Works of Turkey were analyzed with an interpolation-based average-estimator model for nutrient load calculation. The nutrient load's impact on the receiving area was determined using satellite images. Annual nitrite (NO2), nitrate...
Tipo: Text
Palavras-chave: Orontes River; Riverine input; Chlorophyll; Iskenderun Bay; Eastern Mediterranean.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00473/58518/61037.pdf

Optimisation de la surveillance des masses d’eau DCE en Méditerranée. Utilisation de produits dérivés d’images satellites en complément du réseau de mesures in-situ
Provedor de dados: 5
Autores: Ganzin, Nicolas; Mangin, Antoine.
This study aims at showing the potential of « water colour » data derived from satellite imagery to optimise the monitoring of coastal waters within the WFD, with the French Mediterranean as a study area. The work is focused on one specific parameter, the surface chlorophyll-A (chl-a) concentration of which a monthly atlas for reference to “normal” values is provided, which consists of : (i) the monthly chl-a median computed from satellite data of 2003, 2004 and 2005 ; (ii) the integration in space of these values, represented by their average over the WFD water masses (except those of very small size) ; (iii) an indicator of the spatial variability of the chl-a through the spatial standard deviation within each water mass. Another important result is the...
Tipo: Text
Palavras-chave: Chlorophylle; Imagerie satellite; Couleur de l’eau; MERIS; MODIS; Directive Cadre sur l’Eau; DCE; Méditerranée; Chlorophyll; Satellite imagery; Water colour; MERIS; MODIS; Water Frame Directive; WFD; Mediterranean.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00398/50906/51677.pdf

Observation and modelling of natural retention structures in the English Channel
Provedor de dados: 5
Autores: Menesguen, Alain; Gohin, Francis.
Accumulation of heat, or dissolved substances (nutrients, pollutants, etc.), or fine suspended particles in a water body is a key process in the functioning of aquatic ecosystems and their resistance to perturbations. In complex and wide open environments such as marine ecosystems, net accumulation is not only linked to the local renewal capacity of the water body, but also to the partial recirculation of water due to convective cells of various sizes. The English Channel, which can be considered as mainly dominated by tidal movements, exhibits such a complex quasi-permanent long-term circulation, made of a central "river" bordered with a lot of nested gyres. Here, we show that structures visible on satellite images of SST (Sea Surface Temperature),...
Tipo: Text
Palavras-chave: Remote sensing; Suspended Particulate Matter; Chlorophyll; SST; Retention structures; Tidal residual circulation; Steady state model; English Channel.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2181.pdf

Premiers résultats sur l'hydrologie, l'oxygène dissous et les pigments photosynthétiques en Manche Occidentale après l'échouage de l"Amoco Cadiz"
Provedor de dados: 5
Autores: Aminot, Alain; Kerouel, Roger.
During the cruises "SUROIT 1", "SUROIT 3" and "THALIA 1", many analyses of dissolved oxygen and chlorophyll have been carried out in order to ascertain some effects of oil spill of "AMOCO CADIZ" on oxygen concentrations and phytoplancton behaviour. These first results show an under-saturation of oxygen, four weeks after stranding, in sea-water standing between 10 to 20 milles eastward of "AMOCO CADIZ". These data allow to do some considerations about oxydation of hydrocarbons in sea-water. In estuaries, especially Aber Wrac'h, one of the most polluted, the analyses do not show obvious anomaly one month after oil spill. Quantitative results on chlorophyll "a" and phaeopigments don't seem to show any noticeable disturbance, neither off, nor near the coast,...
Tipo: Text
Palavras-chave: Amoco Cadiz; Chlorophylle; Oxygène dissous; Manche; Amoco Cadiz; Chlorophyll; Dissolved oxygen; Engllsh Channel.
Ano: 1978
URL: http://archimer.ifremer.fr/doc/00306/41719/40930.pdf

Etude de la variation des paramètres biomasse (Chla) et turbidité sur plus de 10 années dans les eaux marines guyanaises par imagerie satellite. - Phase 2 : utilisation de la résolution à 300 m
Provedor de dados: 5
Autores: Lampert, Luis; Bryere, Philippe; Gohin, Francis.
On the extremely turbid waters of French Guyana, the high-resolution satellite imagery (300 m) seems a very good tool for monitoring coastal and estuarine waters. It is possible to adjust the algorithms and calculation methods to be in the range of values suggested by in-situ measurements and thus, have the long data series, where P90chla and P90turbi parameters can be calculated on the MEC.
Tipo: Text
Palavras-chave: Guyane française; Images satellite; Turbidité; Chlorophylle; P90; MEC; MET; DCE; French Guiana; Satellite imagery; Turbidity; Chlorophyll; P90; MEC; MET; DCE.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00369/47992/48020.pdf

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea
Provedor de dados: 5
Autores: Lefebvre, Alain; Devreker, David.
The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of...
Tipo: Text
Palavras-chave: Eutrophication; Assessment; Marine Strategy Framework Directive (MSFD); Water Framework Directive (WFD); Oslo and Paris Convention (OSPAR); English Channel; Celtic Seas; Bay of Biscay; Mediterranean Sea; Nutrients; Chlorophyll; Oxygen; Turbidity; Phytoplankton; Macro-algae.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75350/76083.pdf

Small-scale variability of zooplankton pyruvate kinase activity in the Gironde Estuary plume (Atlantic French Coast): A case study under unusually low freshwater discharge
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
Pyruvate kinase (PK) activity measurements are used to assess the role of carbohydrates in global feeding of mesozooplankton communities inhabiting an estuary plume. As a consequence of a remarkably low freshwater discharge rate, the sea surface layers of the area under estuarine influence showed a very moderate salinity fall and a nearly total depletion in nitrates, whereas higher levels of these nutrients were found in deeper, more saline, layers. Small-scale PK activity variations in mesozooplankton appear to be closely correlated to nitrate integration values within the water column. The results were analysed in comparison with literature reports. The study produced a coherent overall interpretation, which strongly supports the reliability of this new...
Tipo: Text
Palavras-chave: Gironde Estuary; Bay of Biscay; Pyruvate kinase; Pyruvate kinase; Carbohydrates; Zooplankton; Phytoplankton; Chlorophyll; Inorganic nutrients.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1745.pdf

Phytoplankton chlorophyll a distribution and water column stability in the central Atlantic Ocean
Provedor de dados: 5
Autores: Agusti, S; Duarte, Cm.
The relationship between the vertical distribution of phytoplankton chlorophyll a and the physical structure of the upper central Atlantic Ocean was investigated based on results from a cruise across the tropical Atlantic (27 degrees N to 36 degrees S). The thermocline was very sharp and shallow in the northern part of the transect, off the coast of Mauritania and Senegal, and deepened progressively to reach &gt; 150 m deep between 20 degrees S and 30 degrees S. There was a deep chl a maximum associated with the thermocline throughout the transect, reaching chl a concentrations up to 50 fold greater than those in surface waters. The chl a concentration was greatest off the NW African coast and declined towards the south, parallel to a progressive deepening...
Tipo: Text
Palavras-chave: Chlorophylle; Phytoplancton; Stabilité verticale; Océan Atlantique central; Chlorophyll; Phytoplankton; Water column stability; Central Atlantic Ocean.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43620/43311.pdf

Growth and gonad development of the tropical black-lip pearl oyster, Pinctada margaritifera (L.), in the Gambier archipelago (French Polynesia)
Provedor de dados: 5
Autores: Le Moullac, Gilles; Tiapari, Jerome; Teissier, Hinano; Martinez, Elodie; Cochard, Jean-claude.
The growth and reproductive cycle of cultured black-lipped pearl oysters, Pinctada margaritifera (L.), were studied in the Gambier Islands (134°52' W, 23°07' S) from September 2002 to August 2003. Temperatures were recorded throughout the year, revealing seasonal temperature variations between 22.3 °C and 27.8 °C. The mean annual chlorophyll a value, as computed from satellite data, was 0.188 ± 0.075 µg L-1. To study growth and reproduction, 720 two-year-old individuals were ear hung on longlines suspended at a depth of 7 m. Samples were taken twice a month to obtain the following measurements: shell height; wet weight of flesh and total oyster; dry weight of adductor muscle, mantle and visceral mass; and glycogen content. Gonad development was also...
Tipo: Text
Palavras-chave: Pearl oyster; Pinctada margaritifera; Growth; Reproduction; Temperature; Chlorophyll; Seasonality; Gambier archipelago.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00040/15099/13570.pdf

Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model
Provedor de dados: 5
Autores: Jose, Yonss; Aumont, Olivier; Machu, Eric; Penven, Pierrick; Moloney, C. L.; Maury, Olivier.
The impact of mesoscale activity on phytoplankton and nutrient distribution in the Mozambique Channel was simulated by coupling a biogeochemical model (PISCES) with a regional oceanic model (ROMS). Examples of the effects of eddies on the biogeochemistry of the Mozambique Channel are presented to illustrate the complexity of the system. In the model, several cyclonic eddies were found with low concentrations of chlorophyll at their cores, which contrasts with previous studies in the open ocean. In addition, several anticyclonic eddies were simulated with high concentrations of chlorophyll at their cores. Phytoplankton growth within these mesoscale features (both cyclonic and anticyclonic eddies) occurred in response to nutrient injection into the euphotic...
Tipo: Text
Palavras-chave: Ocean physical-biogeochemical coupling; Cyclonic and anticyclonic eddies; Chlorophyll; Nutrients; Mozambique Channel.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00162/27320/25549.pdf

Overview of eutrophication indicators to assess environmental status within the European Marine Strategy Framework Directive
Provedor de dados: 5
Autores: Ferreira, Joao G.; Andersen, Jesper H.; Borja, Angel; Bricker, Suzanne B.; Camp, Jordi; Da Silva, Margarida Cardoso; Garces, Esther; Heiskanen, Anna-stiina; Humborg, Christoph; Ignatiades, Lydia; Lancelot, Christiane; Menesguen, Alain; Tett, Paul; Hoepffner, Nicolas; Claussen, Ulrich.
In 2009, following approval of the European Marine Strategy Framework Directive (MSFD, 2008/56/EC), the European Commission (EC) created task groups to develop guidance for eleven quality descriptors that form the basis for evaluating ecosystem function. The objective was to provide European countries with practical guidelines for implementing the MSFD, and to produce a Commission Decision that encapsulated key points of the work in a legal framework. This paper presents a review of work carried out by the eutrophication task group, and reports our main findings to the scientific community. On the basis of an operational, management-oriented definition, we discuss the main methodologies that could be used for coastal and marine eutrophication assessment....
Tipo: Text
Palavras-chave: Eutrophication; Chlorophyll; Dissolved oxygen; Harmful algae; Marine; Coastal; Assessment methods; Europe; Marine Strategy Framework Directive; Water Framework Directive.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00039/15055/12609.pdf

Apports de nutriments et développement phytoplanctonique en baie de Seine
Provedor de dados: 5
Autores: Aminot, Alain; Guillaud, Jean-francois; Andrieux Loyer, Francoise; Kerouel, Roger; Cann, Philippe.
As part of the Programme National d'Oceanographie Cotiere, the nutrient dynamics of the Bay of Seine were studied between 1992 and 1994 in order to complement work on ecological modelling. Firstly, the River Seine's nutrient fluxes were established: 80 000-130 000 t a(-1) of dissolved inorganic nitrogen, 6 400-8 400 t a(-1) of dissolved phosphorus and 20 000-77 000 t a(-1) of dissolved silicium. Estuarine processes were taken into account. Consequences of nutrient loading for the bay were then evaluated at the pelagic level (nutrient and chlorophyll enrichments) and the benthic level (distribution of various phosphorus fractions in superficial sediments). The large continental inputs always induce concentration gradients in the water from the mouth of the...
Tipo: Text
Palavras-chave: Baie de Seine; Rapport de consommation; Chlorophylle; Nutriment; Bay of Seine; Uptake ratio; Chlorophyll; Nutrient.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-844.pdf

UPLC-MSE Profiling of Phytoplankton Metabolites: Application to the Identification of Pigments and Structural Analysis of Metabolites in Porphyridium purpureum
Provedor de dados: 5
Autores: Juin, Camille; Bonnet, Antoine; Nicolau, Elodie; Berard, Jean-baptiste; Devillers, Romain; Thiery, Valerie; Cadoret, Jean-paul; Picot, Laurent.
A fast and high-resolution UPLC-MSE analysis was used to identify phytoplankton pigments in an ethanol extract of Porphyridium purpureum (Pp) devoid of phycobiliproteins. In a first step, 22 standard pigments were analyzed by UPLC-MSE to build a database including retention time and accurate masses of parent and fragment ions. Using this database, seven pigments or derivatives previously reported in Pp were unequivocally identified: beta,beta-carotene, chlorophyll a, zeaxanthin, chlorophyllide a, pheophorbide a, pheophytin a, and cryptoxanthin. Minor amounts of Divinyl chlorophyll a, a chemotaxonomic pigment marker for prochlorophytes, were also unequivocally identified using the database. Additional analysis of ionization and fragmentation patterns...
Tipo: Text
Palavras-chave: Carotenoid; Chlorophyll; Dereplication; Divinyl chlorophyll a; Galactosyldiacylglycerol; Gracilamide; Mass spectrometry; MSE; Phytoplankton; Pigment; Porphyridium purpureum; UPLC.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00269/37994/36069.pdf

Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel
Provedor de dados: 5
Autores: Jose, Y. S.; Penven, P.; Aumont, O.; Machu, E.; Moloney, C. L.; Shillington, F.; Maury, O.
We used a coupled physical-biogeochemical model to investigate how the strong eddy activity typical of the Mozambique Channel affects biological production. A numerical experiment was carried out, in which mesoscale dynamics were suppressed by cancelling the nonlinear terms for horizontal momentum in the Naviers-Stokes equation.  Mesoscale dynamics were found to be responsible for (1) increased offshore production in the Mozambique Channel as a result of net eddy-induced offshore transport of nutrient-rich coastal waters; (2) decreased shelf production along the central Mozambican and south-west Madagascar coast caused by a reduction in nutrient availability related to the net eddy-induced lateral transport of nutrients; (3) increased coastal production...
Tipo: Text
Palavras-chave: Mesoscale dynamics; Chlorophyll; Primary production; Mozambique Channel.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00317/42860/42286.pdf

Plankton communities of the South Atlantic anticyclonic gyre
Provedor de dados: 5
Autores: Piontkovski, Sa; Landry, Mr; Finenko, Zz; Kovalev, Av; Williams, R; Gallienne, Cp; Mishonov, Av; Skryabin, Va; Tokarev, Yn; Nikolsy, Vn.
Data collected during cruises of the Former Soviet Union (in 1963-1989) and the British Atlantic meridional transect program (in 1995-1999) were used to analyse macroscale patterns in phyto- and zooplankton biomass, size structure, species diversity, chlorophyll a, and plankton bioluminescence in the macroscale anticyclonic gyre of the South Atlantic Ocean. The spatial pattern of bioluminescence intensity was in good agreement with that of remotely sensed (CZCS) chlorophyll a, phosphate, salinity, and copepod species diversity index distributions especially in terms of geographic inclinations of the isolines, both associated with the north-westward pattern off the South equatorial current. Among the 416 copepod species recorded in samples, 51 species were...
Tipo: Text
Palavras-chave: Zooplancton; Chlorophylle; Bioluminescence; Altantique Sud; Zooplankton; Chlorophyll; Bioluminescence; South Atlantic Ocean.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00322/43271/43002.pdf

In situ estimations of uptake and release of material by oysters in the Bay of Marennes-Oléron (France)
Provedor de dados: 5
Autores: Zurburg, Wouter; Smaal, Aad; Heral, Maurice; Dankers, Norbert.
The uptake and release of material by oysters (Crassostrea gigas) in the intertidal zone were estimated in situ in the Bay of Marennes-Oléron (France) in spring and autumn. 10 m long plexiglass tunnels were placed over small tables with bags containing oysters or empty oyster shells (control). Although in the very turbid conditions of the water column sedimentation of suspended particulate material could be observed in control experiments, higher fluxes (uptake) of seston, POC and PON and especially chlorophyll occurred in the presence of live animals. Release of dissolved nutrients was not evident from the tunnel with oysters, which is in contrast with studies in other areas with bivalves. This is ascribed to limited mineralization of biodeposits as an...
Tipo: Text
Palavras-chave: Chlorophyll; Seston; Oysters; Nutrient release; Material uptake.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-6842.PDF

Use of SeaWiFS data for light availability and parameter estimation of a phytoplankton production model of the Bay of Biscay
Provedor de dados: 5
Autores: Huret, Martin; Gohin, Francis; Delmas, Daniel; Lunven, Michel; Garcon, Véronique.
Processing SeaWiFS (Sea-viewing Wide Field-of-view Sensor) data provides useful information for the observation and modelling of the phytoplankton production of the Bay of Biscay. Empirical algorithms allow the retrieval of chlorophyll a and non-living Suspended Particulate Matter (SPM) concentrations. These data are used to constrain a coupled 3D physical-biogeochemical model of the Bay of Biscay continental shelf Two issues are investigated, depending on the variable used, to constrain the winter to spring phytoplankton production for the year 2001. First, SPM data is used as forcing data to correct the corresponding state variable of our model. This allows the realistic simulation of the light limited bloom at the end of February 2001, as observed with...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Parameter estimation; Chlorophyll; Suspended Particulate Matter; Physical biogeochemical modelling.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2493.pdf

Variabilité hydrologique et biologique du golfe du Lion. II. Productivité sur le bord interne du courant
Provedor de dados: 5
Autores: Conan, P; Pujo-pay, M; Raimbault, P; Leveau, M.
An estimation of the annual productivity in the Gulf of Lions has been made in the 0-100 m layer using a Let-Go system, with monthly measurements at a fixed station. A value of 140 to 150 g m(-2) a(-1) of C is found, of which around 75 % occurs in the upper 50 m. The seasonal production is described according to three distinct patterns during the two hydrological seasons: (1) variable production in winter; (2) surface bloom in late winter; (3) homogeneous and mean production in summer with a clear Deep Chlorophyll Maximum. The hydrological winter phase represented 60 % of total annual production. The seasonal duality of the hydrodynamic system and the mesoscale variations of the Northern Mediterranean Current account for the variability and the evolution...
Tipo: Text
Palavras-chave: Production primaire; Bilan; Nitrate; Chlorophylle; Cycle saisonnier; Primary production; Budget; Nitrate; Chlorophyll; Seasonal cycle.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00325/43639/43248.pdf

Seston dynamics and bivalve feeding in the Bay of Marennes-Oléron (France)
Provedor de dados: 5
Autores: Zurburg, Wouter; Smaal, Aad; Heral, Maurice; Dankers, Norbert.
Within the framework of an investigation into the carrying capacity of the Bay of Marennes-Oléron (France) for bivalve culture, the in situ uptake of suspended particulate material by oysters (Crassostrea gigas) and mussels (Mytilus edulis) was determined in experiments with benthic ecosystem tunnels. Very high fluctuations in seston quantity and quality were observed within and between tidal cycles. The percentage of organic carbon was inversely related to seston quantity at low concentrations. Organic carbon was diluted by resuspension of material rich in inorganic matter. At high seston concentrations a constant level of about 2% organic carbon was found. The CIN ratio was relatively constant throughout the seasons and fairly low (6.5 to 8.4). Owing to...
Tipo: Text
Palavras-chave: Microphytobenthos; Chlorophyll; Feeding; Mussel; Oyster; Seston quality; Seston load.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-6843.PDF

Effect of 1-Nitronaphthalene on Lipids in Germinating Wheat (Triticum aestivum)
Provedor de dados: 19
Autores: FUKUSHIMA, Michihiro; OKUMURA, Masaru; NAKANO, Masuo; NEGISHI, Takashi; 福島, 道広; 奥村, 理; 中野, 益男; 根岸, 孝.
http://www.obihiro.ac.jp/~library/kenkyu.html
Palavras-chave: 1- nitronaphthalene; Germinating wheat; Lipid; Chlorophyll; 1- naphthylamine.
Ano: 1993
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3771

Respostas ecofisiológicas de Aniba parviflora ao sombreamento
Provedor de dados: 190
Autores: Felsemburgh, Cristina Aledi Aledi; Santos, Keilla Jeanne dos; Camargo, Plínio Barbosa de; Carmo, Janaina Braga do; Tribuzy, Edgard Siza.
Com o objetivo de avaliar as respostas ecofisiológicas de mudas de macacaporanga (Aniba parviflora) em diferentes níveis de sombreamento foi conduzido um experimento no viveiro de mudas da Universidade Federal do Oeste do Pará, em Santarém-PA. Os níveis de sombreamento foram 30%, 50% e 70% de sombreamento e a pleno sol com 0% de sombreamento. O delineamento foi inteiramente casualizado, com quatro repetições, das quais cada uma foi composta por cinco plantas. Foram avaliados altura, diâmetro, número de folhas, área foliar, área foliar específica, massa seca da raiz, caule, folhas e total, taxa assimilatória líquida, condutância estomática, transpiração, eficiência do uso da água e teores de clorofila. Os maiores valores para altura, área foliar e área...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recursos Florestais; Silvicultura; Fitotecnia Crescimento. Níveis de sombreamento. Macacaporanga Growth; Chlorophyll; Macacaporanga.
Ano: 2016
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/964

Growth and quality of potted ornamental peppers treated with paclobutrazol
Provedor de dados: 86
Autores: França,Christiane de Fátima Martins; Ribeiro,Wellington Souto; Santos,Mirelle Nayana Sousa; Petrucci,Kharen Priscilla de Oliveira Salomão; Rêgo,Elizanilda Ramalho do; Finger,Fernando Luiz.
Abstract: The objective of this work was to evaluate the action of paclobutrazol (PBZ) on the growth and ornamental value of two pepper accessions and two commercial cultivars of ornamental pepper - Biquinho Vermelha and Bode Amarela. A PBZ aqueous solution (250 mL) was used to soak the substrate at 0, 20, 40, and 60 mg L-1 a.i. concentrations when the plants had 12 cm height. At the end of plant growth, the follwoing parameters were evaluated: plant height, chlorophyll content in leaves, number of fruit and leaves, and canopy compactness at the time the plants reached maturity to be marketed, with 30% of ripe fruit. Irrespective of the applied PBZ concentration, plant height diminished, and chlorophyll content increased. PBZ did not improve the ornamental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Capsicum chinense; Chlorophyll; Growth regulator.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000300316

Basil conservation affected by cropping season, harvest time and storage period
Provedor de dados: 86
Autores: Silva,Franceli da; Santos,Ricardo Henrique Silva; Andrade,Nélio José de; Barbosa,Luiz Cláudio Almeida; Casali,Vicente Wagner Dias; Lima,Renato Ribeiro de; Passarinho,Ricardo Vaz de Melo.
Fresh basil (Ocimum basilicum L.) is used in food, phytotherapic industry, and in traditional therapeutic, due to its essential oil content and composition. Nevertheless basil can not be kept for long periods after harvest and its quality can be reduced. This work aimed to assess the influence of the season and harvest time in the postharvest conservation of basil stored for different periods. Basil was harvested at 8 am and 4 pm both in August/1999 and January/2000. Cuttings were conditioned in PVC packages and stored for 3, 6, and 9 days. During storage, chlorophyll content, essential oil content and composition were determined as well as microbiological analyses were carried out. Harvest season and the days of storage influenced the final content of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ocimum basilicum; Eugenol; Linalool; Chlorophyll; Mold; Yeast.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000400002

Physiological and morphological responces of Brachiaria spp. to flooding
Provedor de dados: 86
Autores: DIAS-FILHO,MOACYR BERNARDINO; CARVALHO,CLÁUDIO JOSÉ REIS DE.
The physiological and morphological responses of the forage grasses Brachiaria brizantha cv. Marandu, B. decumbens and B. humidicola were compared for plants grown in pots under flooding and well-drained conditions for 14 days. Flooding reduced specific leaf area and biomass allocation to roots in all species and enhanced leaf senescence in B. brizantha and B. decumbens. Relative growth rate was reduced by flooding in B. brizantha and B. decumbens, but not in B. humidicola.Leaf elongation rate was unaffected by flooding in B. decumbens and B. humidicola, but declined in B. brizantha since the first day of flooding. Net photosynthesis and leaf chlorophyll content were reduced by flooding in B. brizantha; however, no flooding effect could be detected in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Brachiaria decumbens; Brachiaria humidicola; Leaf area; Chlorophyll; Photosynthesis; Biomass; Growth rate.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000001000006

Physiologic parameters of soybean of determinate and indeterminate growth habit subjected to levels of soil moisture
Provedor de dados: 86
Autores: Machado Júnior,Carlos Sebastião; Silva,Cláudio Ricardo da; Sanches,Maria Cristina; Hamawaki,Osvaldo Toshiyuki; Sousa,Larissa Barbosa de.
Abstract: The objective of this work was to evaluate the physiological and production parameters of soybean (Glycine max) cultivars of determinate and indeterminate growth habits, in three levels of soil moisture. Three cultivars of determinate growth habit and three of indeterminate growth, at the beginning of the reproductive stage, were subjected to three levels of soil moisture: control, moisture at field capacity; moderated, 50% of the control level; and severe, 25% of the control level. Leaf gas exchange, xylem-water potential, chlorophyll content, chlorophyll a fluorescence, plant dry matter, and grain yield per plant were evaluated. The cultivars of indeterminate growth habit showed the greatest values for stomatal conductance and CO2 assimilation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Chlorophyll; Fluorescence; Gas exchange.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000600419

Physiological changes during postharvest senescence of broccoli
Provedor de dados: 86
Autores: Finger,Fernando Luiz; Endres,Laurício; Mosquim,Paulo Roberto; Puiatti,Mário.
The objective of this work was to determine the early physiological changes throughout shelf life of fresh broccoli (Brassica oleracea L. var. italica) cv. Piracicaba Precoce at 25ºC and relative humidity of 96% in the dark until complete senescence. Head inflorescences showed lack of turgidity and commercial value when weight loss reached up to 5%, coinciding with 48 hour after harvest. Chlorophyll content was stable until 24 hours after harvesting; afterwards, an intense degradation phase took place. At 72 hours, total head yellowing was observed when chlorophyll content dropped to 30% of its initial content. Peroxidase activity increased by 1.4 fold during the first six hours, dropping to its lowest level approximately 24 hours after harvesting....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Peroxidase; Respiration; Starch; Soluble sugars.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000900006

Sodium sulfate exposure slows growth of native pecan seedlings
Provedor de dados: 85
Autores: Moreno-Izaguirre,E; Ojeda-Barrios,D; Avila-Quezada,G; Guerrero-Prieto,V; Parra-Quezada,R; Ruiz-Anchondo,T.
Pecan [Carya illinoensis (Wanngenh) K. Koch] is one of the most important nut crops in arid and semiarid regions of Mexico. Here, most pecans are grown in saline soils having poor permeability which are further degraded by the use of low-quality irrigation water. Salinity adversely affects both pecan nut quality and yield. Little work has been done to explore the physiological effects of salinity on native pecan trees. Here we examine physiological changes determined by exposure of pecan seedlings to sodium sulfate (Na2SO4) at four concentrations: 1000, 2000, 3000 and 4000 mg/L applied twice weekly over a 70 d period. Control plants were similarly irrigated but with water free of Na2SO4. The aim was to identify and quantify the putative salinity damage to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomass; Carya illinoensis; Chlorophyll; Proline; Salinity.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100012

Contents of Pigments and Activity of Antioxidant Enzymes in Rice Plants Pre-Treated with Sodium Nitroprusside and Exposed to Clomazone
Provedor de dados: 87
Autores: SILVA,K.S.; TABALDI,L.A.; ROSSATO,L.V.; CAVICHIOLI,B.M.; BASÍLIO,V.B.; MACHADO,S.L.O.
ABSTRACT: The pre-treatment of rice seeds with sodium nitroprusside (SNP) was used to investigate the effect of exogenous nitric oxide on the pigment content and the activity of antioxidant enzymes during the inhibition of the 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway by the herbicide clomazone. The seeds were soaked in SNP solution (200 mM) for one and 10 hours and sprayed with clomazone, at post-seeding and at the needle-point, with 612 (experiment 1) and 1,224 g a.i. ha-1 (experiment 2). The control of both factors received distilled water. Carotenoids, chlorophylls a, b and total, superoxide dismutase (SOD), guaiacol peroxidase (POD) and the correlation between the variables were evaluated in the shoot of the plants. When compared to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Carotenoids; Oryza sativa; Superoxide dismutase; Guaiacol peroxidase.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100231

Influence of wheat straw and rhizosphere on seed germination, early seedling growth and bio-chemical attributes of Trianthema portulacastrum
Provedor de dados: 87
Autores: Khaliq,A; Matloob,A; Aslam,F; Bismillah Khan,M.
Decomposing wheat (Triticum aestivum) straw and rhizosphere-infested soil were evaluated for their suppressive activity against horse purslane (Trianthema portulacastrum), a noxious summer weed in Pakistan. Two separate pot studies were carried out. Wheat straw was incorporated at 4, 6 and 8 g kg-1 soil five days before the sowing of horse purslane. Pots without straw incorporation were maintained as control. In a second study, soil was taken from 15 and 30 cm depths from a previously cropped wheat field immediately after its harvest and was used as growing medium. Soil from an intentionally uncropped area of the same field was used as control. Suppressive activity was measured in terms of germination dynamics, seedling growth, and biochemical attributes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allelopathic rhizosphere; Chlorophyll; Phenolics; Antioxidants.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000300006

Determination of photosynthetic pigments in fleabane biotypes susceptible and resistant to the Herbicide Glyphosate
Provedor de dados: 87
Autores: Kaspary,T.E.; Lamego,F.P.; Cutti,L.; Aguiar,A.C.M.; Bellé,C.
Chlorophylls and carotenoids are the main photosynthetic pigment in plants. In the weeds, the greatest amount of photosynthetic pigments can result in high competitiveness of the species. The aim of this study was to quantify the content of photosynthetic pigments in biotypes of fleabane (Conyza bonariensis) susceptible and resistant to glyphosate, by two different methods, as well as a correlation between chlorophyll content obtained by portable and classical methodology (extractable chlorophyll). An experiment was conducted in greenhouse and laboratory, 2 x 5 factorial scheme, where factor A was equivalent to biotypes of fleabane (resistant and susceptible to glyphosate) and factor B to developmental stages plants (rosette vegetative I, II and III and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Chlorophyll; Carotenoids; Resistance.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200020

The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean
Provedor de dados: 90
Autores: Maia,Suelen Cristina Mendonça; Soratto,Rogério Peres; Nastaro,Beatriz; Freitas,Lucas Barbosa de.
Chlorophyll determination with a portable chlorophyll meter can indicate the period of highest N demand of plants and whether sidedressing is required or not. In this sense, defining the optimal timing of N application to common bean is fundamental to increase N use efficiency, increase yields and reduce the cost of fertilization. The objectives of this study were to evaluate the efficiency of N sufficiency index (NSI) calculated based on the relative chlorophyll index (RCI) in leaves, measured with a portable chlorophyll meter, as an indicator of time of N sidedressing fertilization and to verify which NSI (90 and 95 %) value is the most appropriate to indicate the moment of N fertilization of common bean cultivar Perola. The experiment was carried out in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Chlorophyll; Relative chlorophyll index; Chlorophyll meter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100019

Nitrate reductase activity and spad readings in leaf tissues of guinea grass submitted to nitrogen and potassium rates
Provedor de dados: 90
Autores: Lavres Junior,José; Santos Junior,João de Deus Gomes dos; Monteiro,Francisco Antonio.
Nitrogen and K deficiency are among the most yield limiting factors in Brazilian pastures. The lack of these nutrients can hamper the chlorophyll biosynthesis and N content in plant tissues. A greenhouse experiment was carried out to evaluate the relationship among N and K concentrations, the indirect determination of chlorophyll content (SPAD readings), nitrate reductase activity (RNO3-) in newly expanded leaf lamina (NL) and the dry matter yield for plant tops of Mombaça grass (Panicum maximum Jacq.). A fractionated 5² factorial design was used, with 13 combinations of N and K rates in the nutrient solution. The experimental units were arranged in a randomized block design, with four replications. Plants were harvested twice. The first harvest occurred...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Enzymatic assay; Nutritional status; Grass forage.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300022

Chlorophyll index for real-time prediction of nutritional status of 'Prata' banana
Provedor de dados: 91
Autores: Arantes,Alessandro de M.; Donato,Sérgio L. R.; Siqueira,Dalmo L. de; Amorim,Edson P.; Rodrigues Filho,Vagner A.
ABSTRACT This study aimed to select regression equations based on the correlation between chlorophyll index and leaf nutrient contents, for real-time prediction of the nutritional status of 'Prata' banana. Six cultivars of 'Prata' banana were used as treatments, with five replicates and four plants per plot, arranged in a completely randomized design. Nutrient levels were evaluated based on laboratorial analysis and chlorophyll indices using a portable chlorophyll meter, in the third leaf from the apex to the base. Data were subjected to analysis of variance, calculating the correlations between leaf nutrient contents and chlorophyll indices, and the regression equations were adjusted to the associations that were significant and with greater magnitude....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Musa spp.; Cultivars; Nutrients; Chlorophyll.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000200099

Gas exchange and photosynthetic pigments in bell pepper irrigated with saline water
Provedor de dados: 91
Autores: Melo,Hidelblandi F. de; Souza,Edivan R. de; Duarte,Heitor H. F.; Cunha,Jailson C.; Santos,Hugo R. B.
ABSTRACT The tools that evaluate the salinity effects on plants have great relevance as they contribute to understanding of the mechanisms of tolerance. This study aimed to evaluate gas exchanges and the contents of photosynthetic pigments in bell peppers cultivated with saline solutions (0, 1, 3, 5, 7 and 9 dS m-1) prepared using two sources: NaCl and a mixture of Ca, Mg, K, Na and Cl salts, in randomized blocks with a 6 x 2 factorial scheme and 4 replicates, totaling 48 experimental plots. The net photosynthesis (A), stomatal conductance (gs), transpiration (E), internal CO2 concentration (Ci), instantaneous carboxylation efficiency (A/Ci) and water use efficiency (WUE), besides chlorophyll a, b and carotenoids were evaluated. The gas exchange parameters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salt stress; Photosynthesis; Chlorophyll; Brazilian semi-arid region.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100038

Portable meters for nutritional assessment in plants of gerbera fertigated with electrical conductivity levels
Provedor de dados: 91
Autores: Mota,Poliana R. D'A.; Villas Bôas,Roberto L.; Ludwig,Fernanda; Fernandes,Dirceu M.; Folegatti,Marcos V.
Rapid tests to assess the nutritional status of plants gerbera can make easier the decision of any adjustments in the fertilization of the substrate. The study was conducted to evaluate nutritionally fertigated gerbera plants with increasing levels of electrical conductivity (EC), using portable meters nitrate and potassium, and chlorophyll. For this, two experiments were conducted. A randomized block design with five levels of EC (0.5, 2.0, 3.5, 5.0 and 6.5 dS m-1) and four replications was used. Cherry cultivar was used in the first experiment. In the second experiment, two cultivars (Cherry and Salmon Rose) were used. In the first experiment, the sap of the leaves was subjected to rapid testing of N-NO3- (equipment Cardy Horiba C -141). N-NO3- and K+...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gerbera jamesonii L.; Chlorophyll; Leaf sap; Solution of the substrate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000300003

Photosynthetic pigments, cell extrusion and relative leaf water content of the castor bean under silicon and salinity
Provedor de dados: 91
Autores: Ferraz,Rener L. de S.; Magalhães,Ivomberg D.; Beltrão,Napoleão E. de M.; Melo,Alberto S. de; Brito Neto,Jósé F. de; Rocha,Maria do S.
ABSTRACTThe castor bean crop plays an important social, environmental and economic role, especially due to possibility of its use as feedstock for the generation of clean energy. Thus, this study aimed to evaluate the contents of photosynthetic pigments, cell membrane extrusion and the relative water content in the leaves of the castor bean cultivar ‘BRS Energia’ under silicon and salinity levels. The experiment was carried out at Embrapa Cotton, in a completely randomized design, in a 4 x 4 factorial scheme, and the treatments consisted of four silicon levels (0, 100, 200 and 300 mg L-1) and four water salinity levels of (ECw 0, 2, 4 and 6 dS m-1), with three replicates. The gradual increase in salinity levels reduced the concentration of photosynthetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ricinus communis L.; Chlorophyll; Electrolyte leakage; Electrical conductivity; Leaf fertilization.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000900841

Gas exchange and organic solutes in forage sorghum genotypes grown under different salinity levels
Provedor de dados: 91
Autores: Coelho,Daniela S.; Simões,Welson L.; Salviano,Alessandra M.; Mesquita,Alessandro C.; Alberto,Keila da C.
ABSTRACT Adaptation of plants to saline environments depends on the activation of mechanisms that minimize the effects of excess ions on vital processes, such as photosynthesis. The objective of this study was to evaluate the leaf gas exchange, chlorophyll, and organic solute in ten genotypes of forage sorghum irrigated with solutions of different salinity levels. The experiment was conducted in a randomized block design, in a 10 x 6 factorial arrangement, with three replications, using ten genotypes - F305, BRS-655, BRS-610, Volumax, 1.015.045, 1.016.005, 1.016.009, 1.016.013, 1.016.015 and 1.016.031 - and six saline solutions, with electrical conductivity (ECw) of 0, 2.5, 5.0, 7.5, 10 and 12.5 dS m-1. The photosynthetic activity in forage sorghum plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salt stress; Photosynthesis; Chlorophyll; Sorghum bicolor (L.) Moench.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000400231

Kinetics of drying of basil leaves (Ocimum basilicum L.) in the infrared
Provedor de dados: 91
Autores: Reis,Renata C. dos; Devilla,Ivano A.; Ascheri,Diego P. R.; Servulo,Ana C. O.; Souza,Athina B. M.
The objective of this paper was to model the drying curves of the leaves of basil (Ocimum basilicum L.) in the infrared at temperatures of 50, 60, 70 and 80 ºC and to evaluate the influence of drying temperature on the color of dried leaves. Drying was conducted in infrared dryer with temperature and greenhouse air circulation. Experimental data were fitted to eight mathematical models. The magnitude of the coefficient of determination (R²), the mean relative error (P), the estimated mean error (SE) and chisquare test (χ2) were used to verify the degree of fitness of the models. From the study it was concluded that: a) the behavior of the drying curves of basil leaves was similar to most agricultural products, the drying times in the infrared were less...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Medicinal plants; Dehydration; Temperature; Chlorophyll.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012001200012

Photosynthetic pigments and biomass in noni irrigated with saline waters with and without leaching
Provedor de dados: 91
Autores: Souto,Antônio G. L.; Cavalcante,Lourival F.; Gheyi,Hans R.; Nunes,Járisson C.; Oliveira,Francisco I. F.; Oresca,Denizard.
ABSTRACTThe response of plants to salt stress is an extremely complex phenomenon that involves morphological, physiological and biochemical changes, modifying the leaf contents of chlorophyll and carotenoids, among others and affecting plant growth, development and production. An experiment was carried out from July 2010 to June 2011, in order to evaluate the contents of chlorophyll a, chlorophyll b, total chlorophyll, carotenoids, the chlorophyll a/b ratio and biomass accumulation of shoots and roots of noni plants, when subjected to irrigation and leaching with water of increasing salinity. The experiment was carried out in a greenhouse, at the Center of Agricultural Sciences of the Federal University of Paraíba, in the municipality of Areia-PB, Brazil....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morinda citrifolia L.; Drainage; Chlorophyll; Saline stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015001101035

BIOACTIVE COMPOUNDS DURING THE MATURATION OF FOUR FRUITS NATIVE TO THE RESTINGA FOREST OF CEARA
Provedor de dados: 94
Autores: GONÇALVES,NIGÉRIA PEREIRA; LUCENA,ELISEU MARLÔNIO PEREIRA DE; BONILLA,ORIEL HERRERA; SILVEIRA,MÁRCIA RÉGIA SOUZA DA; TAVARES,FRANCISCA JÉSSICA COSTA.
ABSTRACT  Fruits provide not only essential nutrients for food, but also bioactive compounds that promote health benefits and help reducing the risk of developing non-communicable chronic diseases. In this sense, this work aimed at quantifying bioactive compounds during the maturation of four fruits native to the Restinga forest of Ceara. Myrtle fruits (Eugenia punicifolia (Kunth) DC.) were collected at the Botanical State Park of Ceara, Caucaia-CE, and guajiru (Chrisobalanus icaco L.), manipuça (Mouriri cearensis Huber) and murici-pitanga fruits (Byrsonima gardneriana A. Juss.) at the Botanical Garden of São Gonçalo, São Gonçalo do Amarante-CE. Fruits were collected at different stages (E) and transported to the Laboratory of Plant Ecophysiology, being...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ascorbic acid; Chlorophyll; Carotenoids; Anthocyanins; Yellow flavonoids.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000500303

Tolerance level of green seed in soybean seed lots after storage
Provedor de dados: 95
Autores: Pádua,Gilda Pizzolante de; França-Neto,José De Barros; Carvalho,Maria Laene Moreira de; Costa,Odair; Krzyzanowski,Francisco Carlos; Costa,Nilton Pereira Da.
The occurrence of green soybean seed due to forced maturation or premature plant death caused by drought or foliar and/or root diseases has been common in several Brazilian production areas. Physiological quality of seed lots with green seed may have their germination and vigor potentials affected and therefore discarded by the grain industry. The objective of this experiment was to determine the maximum tolerated level of green seed in soybean seed lots, which is information of major importance for seed producers when taking the decision whether to sell these lots. Soybean seed of the cultivars CD 206, produced in Ubirata, Parana, and ‘FMT Tucunare,’ produced in Alto Garças, Mato Grosso, were used in the study. Green seed and yellow seed of both cultivars...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Chlorophyll; Deterioration; Vigor.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222007000300015

Response of soybean genotypes to the expression of green seed under temperature and water stresses
Provedor de dados: 95
Autores: Pádua,Gilda Pizzolante de; Carvalho,Maria Laene Moreira De; França-Neto,José De Barros; Guerreiro,Mário César; Guimarães,Renato Mendes.
Soybeans grown under water stress associated with high temperatures during seed maturation and pre-harvest may produce green seed (GS) with expressive reduction in seed quality. The objectives of this study were to evaluate the response of different soybean cultivars grown under these stressful conditions regarding their susceptibility to GS production and to determine the chlorophyll retention levels and the chlorophyllase activity in the seeds. Seeds of four soybean cultivars [BRS 133, CD 206, MG/BR 46 (Conquista) and BRSMG 251 (Robusta)] were grown under greenhouse conditions until R5.5. At R6, the plants were transferred to phytotrons under temperature stress (from 28ºC to 36ºC) and with water stresses of 10% gravimetric moisture, no water and normal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Chlorophyll; Chlorophyllase; Seed quality.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000300016

Gas exchange in massai grass under five nitrogen fertilization levels during establishment and regrowth
Provedor de dados: 96
Autores: Lopes,Marcos Neves; Lacerda,Claudivan Feitosa de; Cândido,Magno José Duarte; Pompeu,Roberto Cláudio Fernandes Franco; Silva,Rodrigo Gregório da; Lopes,José Wellington Batista; Fernandes,Francisco Ronaldo Belém; Bezerra,Francisco Marcus Lima.
The objective of this study was to evaluate gas exchange in the massai grass during establishment and regrowth cycles in a greenhouse, using five nitrogen (N) fertilization levels. A completely randomized split-plot design of five nitrogen levels (0; 150; 300; 450 and 600 mg N•dm-3 of soil) was employed with the N levels as plots, and the cycles (establishment, regrowth 1 and 2) as subplots, evaluated with five replicates. We evaluated leaf transpiration (E), leaf temperature (TFOL), leaf photosynthesis rate (A), leaf carbon dioxide concentration (Ci), stomatal conductance (gs), photosynthesis/transpiration ratio (A/E), photosynthesis/conductance ratio (A/gs), chlorophyll relative index (CRI), and nitrogen sufficiency index (NSI). Growth cycles influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; CO2 concentration; Panicum maximum; Photosynthesis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000900004

Production and nutrition of irrigated Tanzania guinea grass in response to nitrogen fertilization
Provedor de dados: 96
Autores: Viana,Maria Celuta Machado; Silva,Inêz Pereira da; Freire,Francisco Morel; Ferreira,Mozart Martins; Costa,Édio Luiz da; Mascarenhas,Maria Helena Tabim; Teixeira,Matheus Ferreira França.
The objective of this study was to evaluate the effects of nitrogen (N) fertilization in the four seasons of the year on forage production, nitrate (NO3) in the sap, total N in the forage and relative chlorophyll index (SPAD reading) in the leaves of irrigated Panicum maximum cv. Tanzania grass, establishing their critical ranges. In addition, we evaluated the ability to predict forage production based on NO3 in the sap, total N in the forage and relative chlorophyll index. The soil in the experimental area was classified as an Oxisol (Red-Yellow Latosol) with a clayey texture. Annual rates of N (0, 200, 400 and 800 kg ha-1) in the form of urea were the treatments tested. Irrigation was performed through a conventional spray system. The NO3 content in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; NO3 in the sap; Panicum maximum; SPAD; Total N content.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000500238

Enzyme activities of phytoplankton in the South Shetland Islands (Antarctica) in relation to nutrients and primary production
Provedor de dados: 97
Autores: IRIARTE,JOSÉ L; GONZÁLEZ,RODRIGO R; QUIÑONES,RENATO A; KANG,SUNG-HO; SHIM,JAE H; VALENZUELA,CYNTHIA P.
Given the potential significance of enzyme activities as a link between internal metabolic pathways and environmental nutrients, we investigated the relationships of nitrate reductase (NR) and alkaline phosphatase (AP) with primary production and inorganic nutrients in South Shetland Islands, Antarctica. Enzymatic activities of the phytoplankton (0.7-210 µm), primary productivity, autotrophic biomass and inorganic nutrients were studied in the upper 100 m depth at nine stations during a cruise in the northwestern area of South Shetland Islands (Antarctica), during late austral spring (December 2000). NR activities fluctuated between 0 and 42.8 nmol L-1 h-1 (mean = 10.08 nmol L-1 h-1, SD = 10.42 nmol L-1 h-1), AP activities between 0.81 and 5.67 nmol L-1...
Tipo: Journal article
Palavras-chave: Nitrate reductase; Alkaline phosphatase; Primary productivity; Chlorophyll; Antarctica.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400009

Enzymatic regulation of photosynthetic and light-independent carbon fixation in Laminaria setchellii (Phaeophyta), Ulva lactuca (Chlorophyta) and Iridaea cordata (Rhodophyta)
Provedor de dados: 97
Autores: CABELLO-PASINI,ALEJANDRO; ALBERTE,RANDALL S.
Carbon is acquired through photosynthetic and non-photosynthetic processes in marine algae. However, little is known about the biochemical regulation of these metabolic pathways along the thallus of seaweeds. Consequently, the objective of this study was to assess the distribution of in vivo carboxylation pathways and to relate them to the in vitro activity of ribulose 1,5-bisphosphate carboxylase/oxygenase (RUBISCO), phosphoenolpyruvate carboxykinase (PEPCK), and phosphoenolpyruvate carboxylase (PEPC) in the Phaeophyte Laminaria setchellii, the Chlorophyte Ulva lactuca, and the Rhodophyte Iridaea cordata. Chlorophyll-a levels did not vary in U. lactuca and I. cordata. However, pigment levels were significantly lower in the meristematic region of L....
Tipo: Journal article
Palavras-chave: Enzymatic activity; Chlorophyll; Light-independent carbon fixation; Photosynthesis.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200002

Effect of fertilisation with urea on development in the ornamental bromeliad Aechmea fasciata
Provedor de dados: 124
Autores: Giampaoli,Patricia; Santos,Daniela Soares dos; Mollo,Luciana; Kanashiro,Shoey; Tavares,Armando Reis.
ABSTRACT The aim of this study was to evaluate the effect of urea fertiliser on the bromeliad, Aechmea fasciata. Plants were submitted to weekly treatments with a solution of 0.0, 0.5, 1.0, 1.5 or 2.0 g urea L-1. After 210 days of the experiment, biometric variables of growth and development of the root and shoot systems were analysed, together with foliar levels of chlorophyll a and b, and of carotenoids. The experimental design was of randomised blocks with four replications; eight plants were used per plot. The data were submitted to regression analysis. The highest values for chlorophyll a and carotenoid content were obtained at a concentration of 1.23 g L-1 urea, and for chlorophyll b at a concentration 1.75 g L-1 urea. Plants of A. fasciata submitted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bromeliaceae; Nitrogen; Mineral nutrition; Chlorophyll.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000400657

Use of light-emitting diode (LED) in the physiology of cultivated plants – review
Provedor de dados: 22
Autores: Lazzarini, Luiz Eduardo Santos; Pacheco, Fernanda Ventorim; Silva, Samia Torres; Coelho, Adriane Duarte; Medeiros, Ana Paula Ribeiro; Bertolucci, Suzan Kelly Vilela; Pinto, José Eduardo Brasil Pereira; Soares, Joyce Doria Rodrigues.
The objective of this study was to demonstrate the effects of the use of LED bulbs in the physiology of cultivated plants. Light-emitting diodes (LEDs) have been proposed as a light source for controlled environments or in plant growth chambers, since they have desirable characteristics for plant development. The development and physiology of plants are strongly influenced by the environment light spectrum provided by the LEDs, among which we can mention the blue, red, green, and their combinations. The blue light, for example, is responsible for a number of important photomorphogenetic features in plants, including stomatal control. Studies indicate that the red wavelength is efficiently absorbed by the pigments present in the plants, since its wavelength...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Light energy; Light spectrum; Photosynthesis; Pigments.
Ano: 2017
URL: http://e-revista.unioeste.br/index.php/scientiaagraria/article/view/16972

Combined effects of water status and iron deficiency chlorosis on grape composition in non-irrigated vineyards
Provedor de dados: 63
Autores: González,María-Rosa; Hailemichael,Girma; Catalina,Álvaro; Martín,Pedro.
ABSTRACT: Although water deficit and iron deficiency chlorosis are common environmental stresses in the Mediterranean area, few data are reported in the literature on their effects on vineyards, when acting simultaneously. The main objective of this research was to study the combined effects of iron deficiency and water status on vigor, yield and fruit composition in rainfed vineyards. Moreover, the investigation aimed to evaluate the feasibility of using foliar chlorophyll content (Chl) and predawn leaf water potential (LWP), measured at veraison, to assess potential quality of grapes in the framework of precision viticulture. For this, 24 non-irrigated ‘Tempranillo’ vineyard subzones were monitored in Ribera del Duero (North-Central Spain) during three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Chlorophyll; Drought; Leaf area index; Stress.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600473

Ecophysiological and anatomical changes due to uptake and accumulation of heavy metal in Brachiaria decumbens
Provedor de dados: 63
Autores: Gomes,Marcelo Pedrosa; Marques,Teresa Cristina Lara Lanza de Sá e Melo; Nogueira,Mariana de Oliveira Gonçalves; Castro,Evaristo Mauro de; Soares,Ângela Maria.
The growth and developmental characteristics of grasses and their high biodiversity make such plants suitable for remediation of areas contaminated by heavy metals. Nevertheless, heavy metal toxic effect on the plants may cause alteration in their metabolic pathways, such as photosynthesis, respiration, and growth, modifying plant anatomy. This work aimed to evaluate the effect of levels of soil contamination (0, 7.5 % and 15 % m³ m-3) on biomass production, on photosynthetic characteristics and on anatomical changes in roots and leaves of brachiaria (Brachiaria decumbens Stapf.). After seeds were planted, seedlings were uprooted and replanted in vases containing soil at different contamination levels, being left to rest for 120 days. At the end of that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Contaminated soil; Chlorophyll; Growth; Potencial photosynthesis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500009

Temperature and modified atmosphere affect the quality of okra
Provedor de dados: 63
Autores: Finger,Fernando Luiz; Della-Justina,Maria Edith; Casali,Vicente Wagner Dias; Puiatti,Mário.
Little information is available on the influence of temperature on plastic films wrapped okra (Albelmoschus esculentus) for their postharvested conservation. This works investigated the influence of the temperature and PVC film on the development of chilling injury and storability from one of the most popular Brazilian cultivar of okra cv. Amarelinho in fruits stored at 5, 10ºC and at 25ºC. Fruits were harvest at commercial maturity stage with length ranging from 8 to 12 cm, and immediately wrapped in PVC over a polystyrene tray and than stored until visible deterioration or wilting symptoms. Lowering the temperature of storage room from 25 to 10 or 5ºC decreased the weight loss in both PVC wrapped and control fruits, with a lower rate at 5ºC. By reducing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Albelmoschus esculentus; Chilling injury; PVC film; Relative water content; Chlorophyll.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000400006

Aroma composition of Tempranillo grapes as affected by iron deficiency chlorosis and vine water status
Provedor de dados: 63
Autores: Sánchez,Ramón; García,María-Rosa González; Vilanova,Mar; Rodríguez-Nogales,José-Manuel; Martín,Pedro.
ABSTRACT: Water deficit and iron nutritional deficiency (iron chlorosis) are frequent environmental stresses affecting grapevine production in the Mediterranean region. The objectives of this work were (i) to study the combined effects of both stresses on aromatic profile of Tempranillo grapes, occurring simultaneously in the vineyard, and (ii) to evaluate the viability of foliar chlorophyll content at veraison (Chl) to early assess aromatic quality potential of grapes in those conditions. Twenty non-irrigated vineyard subzones (10 m × 10 m each), affected and non-affected by iron chlorosis, were monitored in Ribera del Duero Appellation of Origin (North-Central Spain) during two consecutive seasons. Factorial ANOVA was performed to study the effects of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera L.; Chlorophyll; Quality; Volatile composition; Water deficit.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000200601

Effect of nitrogen fertilization on productivity and quality of Mombasa forage (Megathyrsus maximum cv. Mombasa)
Provedor de dados: 109
Autores: Munari-Escarela,Carolina; Pietroski,Marizane; Mello-Prado,Renato de; Silva-Campos*,Cid Naudi; Caione,Gustavo.
Abstract Mombasa grass is very demanding and responsive to soil fertility. The objective of the present study was to evaluate forage production and the correlation among crude protein and the green color index of leaves of Megathyrsus maximum cultivar Mombasa in function of nitrogen levels. The study was conducted using 5 dm-3 pots in a greenhouse at the Universidade Estadual Paulista - UNESP, Jaboticabal, São Paulo. The experimental design consisted of randomized blocks with five treatments and four replications. Treatments were nitrogen rates (0, 62.5, 125, 250 and 500 mg dm-3 of N), corresponding to 0, 125, 250, 500 and 1000 kg ha-1 of N. We evaluated the production of grass dry matter, the green color index, the accumulation of nitrogen and crude...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Forage; Plant nutrition; Protein; Urea.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100042

Effects of sucrose and irradiance on germination and early gametophyte growth of the endangered tree fern Dicksonia sellowiana Hook (Dicksoniaceae)
Provedor de dados: 39
Autores: Renner,Gladys Daniela Rogge; Randi,Áurea Maria.
It is an endangered tree fern that grows in mixed umbrophylus forests in the tropics. Sterilized spores were germinated at 25 ± 2ºC under a 16-hour photoperiod, in Dyer and MS medium supplemented with 0 to 5% sucrose. The germination was lower with the addition of sucrose. Dry mass was higher in 30-day-old gametophytes cultivated in Dyer medium with the addition of 3 to 5% of sucrose. The dry mass decreased in 30-day-old gametophytes cultivated in Dyer and MS media without sucrose and in MS medium with the addition of 4 or 5% of sucrose. The effect of different irradiance on the germination and early gametophyte development of D. sellowiana was analyzed in the autumn of 1998 (May until July). Conical flasks containing spores were kept over a period of 49...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sugar; Chlorophyll; Gametophyte; Germination; Irradiance.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000200017

Foliar application of 28-homobrassinolide mitigates salinity stress by increasing the efficiency of photosynthesis in Brassica juncea
Provedor de dados: 39
Autores: Alyemeni,Mohammed Nasser; Hayat,Shamsul; Wijaya,Leonard; Anaji,Abdullah.
Prior to sowing, seeds of Brassica juncea Czern and Coss cv. Varuna were soaked in water (controls) or in 50, 100 or 150 mM of sodium chloride (NaCl) for 6 h. The resulting plants, at 15, 30 and 45 days after sowing (DAS) were either not treated (controls) or were treated with aqueous solutions of the hormone 28-homobrassinolide (HBL), which was applied to their foliage in concentrations of 10-10, 10-8 or 10-6 M. The concentration of NaCl showed an inverse correlation with the activity of nitrate reductase (EC 1.6.6.1), the activity of carbonic anhydrase (EC 4.2.1.1), chlorophyll content at 60 DAS, the rate of photosynthesis at 60 DAS, and seed yield at 140 DAS (at harvest), all of which decreased in parallel with increases in NaCl concentration. However,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbonic anhydrase; Chlorophyll; Homobrassinolide; Nitrate reductase; Seed yield.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000300007

Relationship between manganese toxicity and waterlogging tolerance in Zea mays L. cv. Saracura
Provedor de dados: 1
Autores: Silva, Dayane Meireles da; Fonte, Nathalia dos Santos da; Souza, Kamila Rezende Dázio de; Rodrigues-Brandão, Isabel; Libeck, Ian Teodoro; Alves, Jose Donizeti.
The objective of this study was to evaluate the relationship between excess manganese and waterlogging tolerance in 18th selection cycle Zea mays L. cv. Saracura plants. Maize plants were transferred to plastic receptacles containing solutions with different concentrations of manganese. Leaves and roots were evaluated at the beginning of treatment and after 7, 14, and 21 days for chlorophyll content, biomass production and antioxidant metabolism. Mn was strongly translocated from the roots to the leaves, triggering a decrease in chlorophyll content. Excess Mn promoted an increase in reactive oxygen species that was accompanied by higher levels of antioxidative enzyme activity and lipid peroxidation. Zea mays L. cv. Saracura efficiently sequestered...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.03.03.00-9 hypoxia; Chlorophyll; Oxidative stress Fisiologia Vegetal.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30997

Non-destructive analysis of photosynthetic pigments in cotton plants - doi: 10.4025/actasciagron.v33i4.10926
Provedor de dados: 1
Autores: Brito, Giovani Greigh; Empresa Brasileira de Pesquisa Agropecuária; Sofiatti, Valdinei; Empresa Brasileira de Pesquisa Agropecuária; Brandão, Ziany Neiva; Empresa Brasileira de Pesquisa Agropecuária; Silva, Vivianny Belo; Empresa Brasileira de Pesquisa Agropecuária; Silva, Franklin Magnum; Empresa Brasileira de Pesquisa Agropecuária; Silva, Dalva Almeida; Empresa Brasileira de Pesquisa Agropecuária.
Analytical techniques used to extract chlorophyll from plant leaves are destructive and based on the use of organic solvents. This study proposes a non-destructive quantification of the photosynthetic pigment concentration in cotton leaves using two portable chlorophyll meters, the SPAD-502 and the CLOROFILOG 1030. After obtaining 200 leaf discs, each with an area of 113 mm2, the greening rate in each disc was determined by the average of five readings from both meters. Immediately after measurement, 5 mL of dimethyl sulfoxide (DMSO) was added, and the samples were kept in a water bath at 70ºC for 30 min. After cooling, 3 mL of the liquid extract was used for analyses by spectrophotometry at 470, 646 and 663 nm. Mathematical models were adjusted from...
Tipo: Pesquisa Empirica de Campo
Palavras-chave: Fisiologia de plantas cultivadas Gossypium hirsutum; Chlorophyll; Carotenoids; Cotton 5.01.03.06-7 Gossypium hirsutum; Chlorophyll; Carotenoids; Cotton.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/10926

Characterization of ‘Sabará’ Jabuticabas at different maturation stages
Provedor de dados: 1
Autores: Becker, Fernanda Salamoni; Vilas Boas, Ana Carolina; Sales, Adones; Tavares, Lucas Silveira; Siqueira, Heloisa Helena de; Vilas Boas, Eduardo Valério de Barros.
This work aimed to evaluate the physicochemical characteristics and enzymatic activity of “Sabará” jabuticaba fruits, which were cultivated in Lavras, Minas Gerais State, Brazil, at different maturation stages. The fruits were harvested and separated into five different stages: totally green fruit, fruit with incipient pigmentation, fruit with a light purple predominance, totally purple fruit and totally dark purple fruit. These fruits were physicochemically analyzed and evaluated for polygalacturonase enzymatic activity. Chlorophyll degradation and the synthesis of anthocyanin on fruit rinds were observed, as well as the degradation of the cell wall and its consequent softening. In the pulp, increased soluble solids, pH and sugars were observed, while...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 50700006 CIÊNCIA E TECNOLOGIA DE ALIMENTOS 50701045 FISIOLOGIA PÓS-COLHEITA Myrciaria jaboticaba; Pectin; Polygalacturonase; Chlorophyll; Anthocyanin. FISIOLOGIA PÓS-COLHEITA.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19499

Ação do enxofre em chuva ácida simulada sobre parâmetros morfofisiológicos de Phaseolus vulgaris L. (Fabaceae) - doi: 10.4025/actasciagron.v32i3.4273
Provedor de dados: 1
Autores: Dias, Bruna Borba; Universidade Federal de Santa Catarina; Leite, Maysa de Lima; Universidade Estadual de Ponta Grossa, Paraná; Farago, Paulo Vitor; Universidade Estadual de Ponta Grossa, Paraná; Oliveira, André Vicente de; Universidade Estadual de Ponta Grossa, Paraná; Beruski, Gustavo Castilho; Universidade Estadual de Ponta Grossa, Paraná.
O presente trabalho teve o objetivo de analisar os efeitos do enxofre e da chuva ácida simulada sobre a estrutura foliar do feijoeiro (Phaseolus vulgaris L), nos aspectos morfoanatômicos, teores de clorofila a, b,  total e feofitina. As plantas-controle sofreram simulações de chuva com pH 6,0 e as plantas-teste sofreram simulação de chuva ácida com pH 3,0. As concentrações de clorofila a, b e total diminuíram no estádio de floração (R6). Já, no estádio R7, onde surgem as primeiras vagens, os teores aumentaram, indicando possível resistência e/ou adaptação dos espécimes às simulações ácidas. O tratamento ácido afetou a concentração de clorofila que foi degradada por processos oxidativos sem a sua conversão em feofitina. Também se observou diminuição na...
Palavras-chave: 5.00.00.00-4; 5.01.03.06-7; Phaseolus vulgaris; Chuva ácida; Enxofre; Clorofila; Anexos epidérmicos Ciências Agrárias e Fisiologia de Plantas Cultivadas Phaseolus vulgaris; Acid rain; Sulfur; Chlorophyll; Epidermal annexes.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/4273

Influência da queima no teor de pigmentos, proteína solúvel e carboidratos em gramíneas de pastagens naturais - doi: 10.4025/actascianimsci.v32i3.8400
Provedor de dados: 2
Autores: Mendes, Cristina Rodrigues; UFSM; Lima, Maria da Graça de Souza; UFPel; Quadros, Fernando Luiz Ferreira de; UFSM; Abreu, Claudete Miranda; FURG; Garagorry, Fábio Cervo; UFSM.
A importância do fogo na origem e na manutenção das áreas de pastagens é bastante discutida. O objetivo foi verificar a influência da queima no teor de pigmentos fotossintéticos, proteína solúvel e carboidratos em gramíneas nativas de pastagem sob pastoreio rotacionado. Foram avaliadas as lâminas foliares de oito gramíneas, de pastagem natural, representantes de quatro grupos funcionais. Foram quantificados teores de pigmentos, proteínas solúveis, carboidratos solúveis, amido e açúcares redutores. A maioria das espécies sem queima teve maior teor de pigmentos. De modo geral, não houve efeito do fogo sobre a proteína solúvel, porém as espécies D. sabulorum, A. affinis e A. laevis se destacaram como o grupo de maior teor proteico solúvel dentre as espécies...
Palavras-chave: Carotenóide; Clorofila; Fotossíntese; Fogo; Grupos funcionais Carotenoid; Chlorophyll; Photosynthesis; Fire; Functional groups.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/8400

Produção e composição químico-bromatológica de duas cultivares de braquiária adubadas com nitrogênio e sua relação com o índice SPAD - DOI: 10.4025/actascianimsci.v31i2.4305
Provedor de dados: 2
Autores: Maranhão, Camila Maida de Albuquerque; UESB; Silva, Cristina Cavalcante Felix da; UESB; Bonomo, Paulo; UESB; Pires, Aureliano José Vieira; UESB.
O estudo foi conduzido com o objetivo de se avaliar a produção de matéria seca da parte aérea (PMSA) e da raiz (PMSR), a composição bromatológica, o teor de clorofila (valor SPAD), assim como se realizar uma análise de correlação entre o teor de clorofila (índice SPAD) e o teor de nitrogênio na planta e produção de matéria seca da parte aérea de duas cultivares de braquiária. O ensaio foi conduzido em esquema fatorial 4 x 2, sendo quatro doses de N (0, 75, 150 e 225 mg dm-3 de N) e duas cultivares de braquiária (Brachiaria brizantha cv. Marandu e Brachiaria decumbens cv. Basilisk) dispostos no delineamento em blocos casualizados com cinco repetições. A PMSA foi incrementada com o aumento das doses de N, enquanto que com a PMSR aconteceu o inverso,...
Palavras-chave: Brachiaria brizantha; Bachiaria decumbens; Clorofila; Raíz Brachiaria brizantha; Bachiaria decumbens; Chlorophyll; Roots.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4305

Optical properties of grapevine leaves: reflectance, transmittance, absorptance and chlorophyll concetration
Provedor de dados: 115
Autores: Cabello-Pasini,Alejandro; Macías-Carranza,Víctor.
Leaf absorptance (A), transmittance (T) and reflectance (R) of visible solar radiation strongly correlate with chlorophyll concentration in a number of plant species, however, little is known about the optical properties of grapevine leaves. Consequently, the objective of this study was to evaluate the optical properties of intact leaves for estimating chlorophyll concentration in Cabernet Sauvignon, Merlot and Tempranillo vaieties. Leaves from Cabernet Sauvignon, Merlot and Tempranillo vines were collected at San Antonio de las Minas, Baja California, México, in 2009, and A, T and R determined with a spectroradiometer. While leaf age played a significant role on the leaf chlorophyll concentration, the chlorophyll a+b concentration vs. R, T and A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absorptance; Chlorophyll; Reflectance; Transmittance; Optical properties.
Ano: 2011
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000800007

Interspecific variation in leaf pigments and nutrients of five tree species from a subtropical forest in southern Brazil
Provedor de dados: 42
Autores: BÜNDCHEN,MÁRCIA; BOEGER,MARIA REGINA T.; REISSMANN,CARLOS B.; GERONAZZO,KELLY M.
ABSTRACT The purpose of this study was to analyze the seasonal variation in the nutrient and pigment content of leaves from five tree species - of which three are perennial (Cupania vernalis, Matayba elaeagnoides and Nectandra lanceolata) and two are deciduous (Cedrela fissilis and Jacaranda micrantha) - in an ecotone between a Deciduous Seasonal Forest and a Mixed Ombrophilous Forest in the state of Santa Catarina, Brazil. Leaf samples were collected in the four seasons of the year to determine the content of macronutrients (N, K, P, Mg, Ca, S) and photosynthetic pigments (Chla, Chlb, Chltot, Cartot, Chla:Chlb and Cartot:Chltot). The principal component analysis showed that leaf pigments contributed to the formation of the first axis, which explains most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Araucaria forest; Deciduous Forest; Macronutrients.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200467

Growth and production of volatile compounds of yarrow (Achillea millefolium L.) under different irrigation depths
Provedor de dados: 42
Autores: ALVARENGA,IVAN C.A.; PACHECO,FERNANDA V.; ALVARENGA,AMAURI A.; BERTOLUCCI,SUZAN K.V.; PINTO,JOSÉ EDUARDO B.P.
Abstract Yarrow (Achillea millefolium L., Asteraceae) is an important medicinal plant used worldwide for its medicinal properties such as the analgesic, antioxidant and anti-inflammatory ones. The aim of this study was to evaluate the growth and production of photosynthetic pigments and of volatile constituents of Achillea millefolium L. under different irrigation depths. The treatments were the application of 55, 110, 220, 440 and 880 mm of water for a period of 110 days. Data were submitted to polynomial regression analysis at 5% probability, while the volatile constituents were analyzed by standard deviation. Different irrigation depths provided quadratic growth responses being the highest dry matter production at the depth of 440 mm. The contents of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water stress; 1; 8 cineol; Chlorophyll; Terpenes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703901

The Effect of Ferrous Nano-oxide Particles on Physiological Traits and Nutritional Compounds of Soybean ( Glycine max L.) Seed
Provedor de dados: 42
Autores: SHEYKHBAGLOU,ROGHAYYEH; SEDGHI,MOHAMMAD; FATHI-ACHACHLOUIE,BAHRAM.
ABSTRACT Soybean (Glycine max L.) seed contains amounts of protein, lipid, carbohydrate and mineral elements, which protein and lipid have been known as a main part for soybean’s trade value. In this study, in order to investigate the effect of ferrous nano-oxide particles on nutritional compounds of soybean seed, an experiment with 5 treatments and 3 replications was conducted as a randomized complete block design. Treatments were 5 concentrations of ferrous nano-oxide particles including 0, 0.25, 0.5, 0.75 and 1 g L-1 which were sprayed 3 times at 4 and 8 leaves stage and pod initiation. Lipid and protein contents, fatty acids profile, some of mineral elements such as Fe, Mg, Ca and P, chlorophyll a, b and total chlorophyll content were determined....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Ferrous nano-oxide; Nutritional compounds of soybean seed; Fatty acids profile; Chlorophyll.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100485

Cadmium toxicity affects chlorophyll a and b content, antioxidant enzyme activities and mineral nutrient accumulation in strawberry
Provedor de dados: 48
Autores: Muradoglu,Ferhad; Gundogdu,Muttalip; Ercisli,Sezai; Encu,Tarik; Balta,Fikri; Jaafar,Hawa ZE; Zia-Ul-Haq,Muhammad.
BACKGROUND: Cadmium (Cd) is well known as one of the most toxic metals affecting the environment and can severely restrict plant growth and development. In this study, Cd toxicities were studied in strawberry cv. Camarosa using pot experiment. Chlorophyll and malondialdehyde (MDA) contents, catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX) activities and mineral nutrient concentrations were investigated in both roots and leaves of strawberry plant after exposure Cd. RESULTS: Cd content in both roots and leaves was increased with the application of increasing concentrations of Cd. We found higher Cd concentration in roots rather than in leaves. Chlorophyll a and b was decreased in leaves but MDA significantly increased under increased...
Tipo: Journal article
Palavras-chave: Antioxidant enzymes; Cadmium; Chlorophyll; Heavy metal stress; Strawberry.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602015000100011

Nitrogen use efficiency in modern wheat cultivars
Provedor de dados: 53
Autores: Todeschini,Matheus Henrique; Milioli,Anderson Simionato; Trevizan,Diego Maciel; Bornhofen,Elesandro; Finatto,Taciane; Storck,Lindolfo; Benin,Giovani.
ABSTRACT The nitrogen use efficiency (NUE) is defined as the capacity of a given genotype in take advantage of the applied nitrogen (N) and transform it in biomass and grains. The objective of this study was to evaluate 12 wheat cultivars as to the NUE and its components. The experiment was conducted in a controlled environment, in a randomized block design with three replications. Twelve wheat cultivars were submitted to four N supply levels (0, 80, 160 and 240 kg of N∙ha–1). The data were submitted to analysis of variance, means multiple comparison, polynomial regression, and path analysis. The nitrogen remobilization efficiency (NRE) was the main NUE component of the evaluated cultivars, in both low and high conditions of nitrogen fertilization. In the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Triticum aestivum; Nitrogen nutrition; Path analysis; Chlorophyll; Yield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300351

Photosynthetic capacity and water use efficiency in sugarcane genotypes subject to water deficit during early growth phase
Provedor de dados: 52
Autores: Silva,Marcelo de Almeida; Jifon,John Lonfover; Santos,Claudiana Moura dos; Jadoski,Cleber Junior; Silva,Jorge Alberto Gonçalves da.
The objective of this study was to compare the gas exchange, photosynthetic capacity and water potential of sugarcane genotypes cultivated under water deficit conditions imposed during the initial growth phase. Experiments were performed in a greenhouse using two sugarcane genotypes namely: HoCP93-776 (drought susceptible) and TCP02-4587 (drought tolerant). Sixty days after planting, two different water treatments were applied (i.e., with or without water deficit). At 0,30 and 60 days after the treatment, gas exchange variables were evaluated for their relationship with water use, intrinsic instantaneous water use efficiency and instantaneous carboxylation efficiency. The SPAD index, photosynthetic pigments, water potential and relative water content in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum spp.; Photosynthesis; Stomatal conductance; Chlorophyll; Drought tolerance; Water potential.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000500004

The influence of light intensity on anatomical structure and pigment contents of Tradescantia pallida (Rose) Hunt. cv. purpurea Boom (Commelinaceae) leaves
Provedor de dados: 52
Autores: Paiva,Élder Antonio Sousa; Isaias,Rosy Mary dos Santos; Vale,Fernando Henrique Aguiar; Queiroz,Cristina Generosa de Senna.
The aim of this work was to study the effects of five different light intensities on the anatomical structure and on the pigment contents in leaves of Tradescantia pallida cv. purpurea. Once light intensity became lower, the thickness of leaf lamina and mesophyll were reduced. Adjustments in light-harvesting antenna size were observed: an increase in chlorophyll a + b/carotenoids ratio at low-light growth conditions. There was a strong positive linear correlation between the light intensity values and anthocyanin contents. Hence, T. pallida cv. purpurea acclimation to distinct environmental conditions might be related to its capacity of altering structurally and physiologically its phenotype.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf anatomy; Light intensity; Chlorophyll; Carotenoids; Anthocyanin; Tradescantia.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000400017

Physiological Responses of Callus from Gerbera jamesonii Bolus ex. Hook f. to Gamma Irradiation
Provedor de dados: 52
Autores: Hasbullah,Nor Azlina; Taha,Rosna Mat; Saleh,Azani; Mohamed,Normadiha.
In the present study, in vitro mutagenesis techniques were applied to investigate the effects of gamma irradiation at 0, 10, 20, 30, 40, 50 and 60 Gy on physiological changes in callus of Gerbera jamesonii Bolus ex. Hook f. Biochemical changes in chlorophyll and soluble protein content of pre- and post- irradiated Gerbera callus were studied. Non-irradiated callus demonstrated the highest amount of chlorophyll content as compared to callus irradiated at 10, 20, 30, 40, 50 and 60 Gy. In addition, the amount of chlorophyll b was relatively higher than chlorophyll a in both the irradiated and non-irradiated callus, except for callus irradiated at 10 Gy. Biochemical differentiation based on total soluble protein content revealed gradual reduction after day 9...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gerbera jamesonii; Gamma irradiation; Callus; In vitro; Chlorophyll; Soluble protein.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000300012

Physiological aspects of sun and shade leaves of Lithraea molleoides (Vell.) Engl. (Anacardiaceae)
Provedor de dados: 52
Autores: Dias,Jaqueline; Pimenta,José Antonio; Medri,Moacyr Eurípedes; Boeger,Maria Regina Torres; Freitas,Claudinei Toledo de.
The aim of this work was to compare the physiological parameters of sun and shade leaves of a specimen of L. molleoides. The higher-positional leaves, classified as sun leaves, presented similar photosynthetic rate, lower chlorophyill contents (a, b and total), same a chlorophyll /b chlrorophyll rate, lower transpiratory rate, same stomatal conductance and intercellular concentration of CO2 as the lower-positional leaves, classified as shade leaves. Nutrient concentration, except for Ca and Mg, was the same for both sun and shade leaves.The physiological parameter responses indicated that although receiving lower light intensity, the shade leaves had the same capacity to grow and develop as the sun leaves.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photosynthesis; Sun leaves; Shade leaves; Light intensity; Chlorophyll; Lithraea molleoides.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100011

Sodium Chloride-Induced leaf senescence in Hydrocotyle bonariensis Lam. and Foeniculum vulgare L.
Provedor de dados: 52
Autores: Haddad,Claudia R. B.; Mazzafera,Paulo.
Leaf senescence induced by sodium chloride was studied in Hydrocotyle bonariensis Lam. and Foeniculum vulgare L. Both species belong to Umbelliferae family, however only H. bonariensis grows spontaneously in sandy soils of coastal regions (saline soils). Leaves of plants receiving nutrient solutions containing different concentrations of NaCl were evaluated for fresh and dry weights and chlorophyll content. The denaturating electrophoretic profiles of leaf proteins were also studied. Sodium chloride changed the protein profile of F. vulgare and hastened the leaf senescence of both the species. However, plants of H. bonariensis receiving 599 mM NaCl lasted longer than F. vulgare. Therefore, the occurrence of H. bonariensis in saline soils might be related...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Protein; Salinity; Senescence.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000200005

Developmental effects of additional ultraviolet a radiation, growth regulators and tyrosine in Alternanthera brasiliana (L.) Kuntze cultured in vitro
Provedor de dados: 52
Autores: Silva,Nina Cláudia Barboza; Macedo,Andrea Furtado; Lage,Celso Luís Salgueiro; Esquibel,Maria Apparecida; Sato,Alice.
Tissue cultures of Alternanthera brasiliana (L.) Kuntze were treated with different growth regulators (Kinetin and 2,4-D), tyrosine and Ultraviolet A radiation (UV-A; 320 - 400 nm) to investigate their effects on development and pigment production. Nodal segments of plantlets grown from seeds were inoculated in all tested media and different light conditions. After eight weeks, this material was used to evaluate biomass, chlorophyll and betacyanin production. The Murashige and Skoog (MS) + kinetin medium resulted in development of approximately four shoots/explant. This medium plus white light was the best combination for micropropagation with the highest rooting percentage and betacyanin production. Plantlets grown under UV-A illumination reduced biomass...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Betacyanin; Chlorophyll; Morphogenesis; Tissue Culture.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000600014

Growth and content of Spirulina platensis biomass chlorophyll cultivated at different values of light intensity and temperature using different nitrogen sources
Provedor de dados: 58
Autores: Danesi,Eliane Dalva Godoy; Rangel-Yagui,Carlota Oliveira; Sato,Sunao; Carvalho,João Carlos Monteiro de.
The effects of light intensity and temperature in S. platensis cultivation with potassium nitrate or urea as nitrogen source were investigated, as well as the biomass chlorophyll contents of this cyanobacteria, through the Response Surface Methodology. Experiments were performed at temperatures from 25 to 34.5ºC and light intensities from 15 to 69 µmol photons m-2 s-1, in mineral medium. In cultivations with both sources of nitrogen, KNO3 and urea, statistic evaluation through multiple regression, no interactions of such independent variables were detected in the results of the dependent variables maximum cell concentration, chlorophyll biomass contents, cell and chlorophyll productivities, as well as in the nitrogen-cell conversion factor. In cultivation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spirulina platensis; Light intensity; Temperature; Nitrogen sources; Chlorophyll.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100046

Flooding tolerance of tomato genotypes during vegetative and reproductive stages
Provedor de dados: 61
Autores: Ezin,Vincent; Pena,Robert De La; Ahanchede,Adam.
A greenhouse experiment was conducted to investigate the effect of flooding on two tomato cultivars and two wild related species. Forty days old tomato plants were subjected to a continuous flooding stress of different durations: 0, 2, 4 and 8 days. Plant pots were placed inside larger plastic pots; they were irrigated with excessive quantity of tap water at 25ºC so that the level of water above the surface of soil was 15 cm throughout the flooding period. At the bottom of each plastic pot a drilled hole allowed complete drainage of the pot after flooding. Parameters studied include plant height, number of leaves, leaf length, chlorophyll fluorescence, chlorophyll content, wilting, leaf senescence, adventitious root formation, number of flowers and fruits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tomato genotypes; Flooding conditions; Chlorophyll; Growth parameters; Yield and yield components.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000200007

Leaf optical properties as affected by shade in saplings of six tropical tree species differing in successional status
Provedor de dados: 61
Autores: Souza,Rogéria Pereira; Válio,Ivany F. M.
Tree species differing in successional status may present different responses to shade. Adjustments at leaf level may affect their optical properties, leading to changes in PAR (photosynthetically active radiation) absorbance. The aim of this study was to evaluate leaf optical properties as affected by understory shade in saplings of six tropical tree species differing in successional status and degree of shade tolerance. Chlorophyll content and specific leaf area (SLA) were also evaluated. The effects of shade on leaf optical properties and chlorophyll content differed among the studied species, whereas increased SLA was a common response for all species, reflecting the occurrence of thinner leaves under shade. The three studied shade-tolerant species -...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Chlorophyll; Leaf absorbance; Shade tolerance; Specific leaf area; Successional species.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000100007

Alterations in biochemical components in mesta plants infected with yellow vein mosaic disease
Provedor de dados: 61
Autores: Chatterjee,Arpita; Ghosh,Subrata K.
Yellow vein mosaic disease of mesta (kenaf, Hibiscus cannabinus L.; and roselle, H. sabdariffa L.) is a new entrant to the disease scenario and it is associated with a novel monopartite Begomovirus. Changes in different biochemical parameters in diseased mesta plants were observed as compared to healthy ones. Isozyme pattern and assays of different enzymes, namely catalase, acid phosphatase, peroxidase, esterase, polyphenol oxidase and superoxide dismutase, revealed lower activities of catalase, acid phosphatase and peroxidase enzymes and enhanced activities of esterase, polyphenol oxidase and superoxide dismutase in diseased plants as compared to healthy ones. Due to the infection, chlorophyll content, phenolics and total soluble protein decreased whereas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Begomovirus; Chlorophyll; Hibiscus; Isozyme pattern; Phenolics; Proline.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000400002

Effect of cadmium on growth, micronutrient concentration, and δ-aminolevulinic acid dehydratase and acid phosphatase activities in plants of Pfaffia glomerata
Provedor de dados: 61
Autores: Skrebsky,Etiane C.; Tabaldi,Luciane A.; Pereira,Luciane B.; Rauber,Renata; Maldaner,Joseila; Cargnelutti,Denise; Gonçalves,Jamile F.; Castro,Gabriel Y.; Shetinger,Maria R.C.; Nicoloso,Fernando T.
Pfaffia glomerata (Spreng.) Pedersen plantlets were grown under different cadmium (Cd) concentrations (0, 20, 40, 60 and 80 μM) in a hydroponic system during 7 d. Plant growth, micronutrient, chlorophyll and carotenoid concentrations, as well as δ-aminolevulinic acid dehydratase (ALA-D; E.C.4.2.1.24) and acid phosphatase (AP; E.C.3.1.3.2) activities were then analysed. Cadmium concentration in both shoots and roots increased with increasing external Cd levels. Metal concentration was on average 12-fold greater in root than in shoot tissues. Root length was unaffected by Cd treatments. In contrast, dry weight of both shoot and roots increased significantly upon addition of 20 and 40 μM Cd. Moreover, shoot and total plant dry weight was only reduced in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian ginseng; Carotenoid; Chlorophyll; Heavy metal; Micronutrient; Phytoremediation.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000400004

Photosensitivity of Cucumber (Cucumis sativus L.) Seedlings Exposed to Ultraviolet-B Radiation
Provedor de dados: 117
Autores: Tapia F,María Luisa; Toro A,Guillermo  ; Parra R,Bélgica  ; Riquelme E,Alejandro.
The intensity of ultraviolet-B radiation (UV-B) has increased on the Earth´s surface due to the stratospheric ozone depletion, causing an adverse effect on a wide range of species, such as morphological, physiological, and biochemical alterations. This research studied the intraspecific photosensitivity of cucumber (Cucumis sativus L.) seedlings exposed to UV-B. Six commercial cultivars were evaluated: Laura, Sprint 440, Dasher II, Exocet, Poinsett 76, and Marketmore 76 under greenhouse-controlled environmental conditions with a hydroponic sandwich-type system with a Hoagland II nutrient solution. Seedlings were irradiated from expanded cotyledons to the third true leaf with three intensities of UV-B radiation (30, 40, and 50 &amp;#956;W cm-2) for 18 d...
Tipo: Journal article
Palavras-chave: UV radiation; Chlorophyll; UV-B absorbing compounds; Chlorosis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000100002

Productivity and drought tolerance of cassava cultivars in the Coastal Tablelands of Northeastern Brazil
Provedor de dados: 65
Autores: Carvalho,Luciana Marques de; Carvalho,Hélio Wilson Lemos de; Oliveira,Ivênio Rubens de; Rangel,Marco Antônio Sedrez; Santos,Vanderlei da Silva.
ABSTRACT: Ten cassava cultivars were grown in the field and evaluated to identify the most adapted to the Coastal Tablelands of northeast Brazil. The cultivars showed differences in proline and chlorophyll contents, plant height, number of leaves and branches, canopy area and root production, however they did not differ on photosynthetic rates. Cultivars 'Tianguá' and '9783-13' presented lower root yield, whereas 'BRS Tapioqueira' and 'Irará' had the highest root yield. Few leaves coupled with the highest water use efficiency for CO2 assimilation was found in 'BRS Kiriris' in contrast to 'BRS Jarina' and '9783-13'. 'BRS Caipira' had high proline content in both Umbaúba and Frei Paulo areas, traits usually associated to drought tolerance, that contribute to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta; Adaptation; Osmotic adjustment; Photosynthesis; Chlorophyll.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000500796

Inhibition of ethylene response by 1-methylcyclopropene in potted ornamental pepper
Provedor de dados: 65
Autores: Finger,Fernando Luiz; Silva,Tania Pires da; Segatto,Fernanda Bastos; Barbosa,José Geraldo.
In the face of great potential of 1-MCP in blocking ethylene action, this study aimed to evaluate the efficacy of 1-MCP on ethylene action and extend the post-production of ornamental peppers Capsicum annuum potted plants. Ornamental pepper cultivar Calypso shows complete abscission of leaves when exposed to 10µL L-1 ethylene. By exposing plants to ethylene, significant drops on a, b and total chlorophyll were found at the end of the treatment. Nevertheless, no changes on leaf total carotenoid were observed after the treatment with ethylene. When the plants were treated with 1-methylcyclopropene (1-MCP), followed or not by treatment with ethylene, contents of a, b, total chlorophyll and carotenoid remained unchanged. Control plants showed no changes in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum annuum; Chlorophyll; Leaf abscission; Post production.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000600964

Growth and nodulation of soybean plants fertilized with poultry litter
Provedor de dados: 64
Autores: Ragagnin,Vilmar Antonio; Sena Júnior,Darly Geraldo de; Dias,Danyllo Santos; Braga,Weslley Fernandes; Nogueira,Phelipe Diego Moraes.
Nowadays much of the chemical fertilizers used in Brazil come from imports, what creates the necessity to seek for alternative fertilizers. One possibility is organic fertilizers, including poultry litter, which presents increasing availability in various regions of the country, due to the expansion of the poultry industry. Despite its availability, there are no enough studies that show the benefits of using poultry litter on soybeans in substitution of mineral fertilizer. The present study aimed to evaluate the effect of different doses of poultry litter on leaf chlorophyll content, nodulation, and development of soybean plants. It was used a completely randomized design with five doses of poultry litter (0, 1, 2, 4 and 8 t ha-1) and a control with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic fertilizer; Glycine max; Chlorophyll.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000100002

Morpho-physiological changes in pineapple plantlets [Ananas comosus (L.) merr.] during acclimatization
Provedor de dados: 64
Autores: Villalobo,Ariel; González,Justo; Santos,Ramón; Rodríguez,Romelio.
Pineapple producing countries lack good quality propagation material to expand cultivars into new areas. Previously, research protocols may increase the offer of high quality plantlets and speed the introduction of new pineapple cultivars. The present work is to evaluate the morpho-physiological changes in plantlets of pineapple [Ananas comosus (L.) Merr. 'MD-2'] during the acclimatization phase. Plantlets were acclimatized under 80% relative humidity, 25.5 °C temperature and photosynthetic photon flux of 400-500 µmol m-2 s-1 as average for 45 d under natural photoperiods. All measurements (plant length, number of leaves and roots, fresh weight, width and length of leaf 'D', net photosynthesis and total transpiration rate) were carried out at the end of in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll; Ex vitro conditions; Photosynthesis; Transpiration.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600004