Consulta: subjectFacets:"Gas exchange"
Registros recuperados: 68
Data/hora: 09/06/2024 14:51:58

PLANT PHYSIOLOGICAL PERFORMANCE AND SEED CHEMICAL COMPOSITION OF SOYBEAN UNDER DIFFERENT SPATIAL ARRANGEMENT
Provedor de dados: 196
Autores: Nobre, Danubia Aparecida Costa; Silva, Rodrigo Rocha; Guimarães Nasser, Vinicius; Silva, Geraldo Humberto; Aquino, Leonardo Angelo; Macedo, Willian.
Poucos estudos apresentam interações entre a fisiologia das plantas e sua posterior composição química, quando cultivadas em diferentes arranjos. Esta pesquisa buscou compreender a relação entre o espaço de cultivo da soja e sua influência sobre a qualidade da semente. Foram estudadas duas cultivares de soja (Tec 7849 Ipro e Monsoy 6972 Ipro) em quatro arranjos espaciais distintos (50,0 x 7,1; 40,0 x 8,9; 30,0 x 11,9 e 18,9 x 18,9 ou 16,2 x 16,2 cm, respectivamente). Durante os estádios fenológicos V4 e R2, foram analisadas trocas gasosas e na colheita, foram constituídos 2 grupos, um de sementes frescas e outro de sementes envelhecidas, para ambos os grupos se analisaram: teste de germinação, vigor, índice de velocidade de germinação, massa fresca das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gas exchange; Germination; Lipids; Gas chromatography; Trocas gasosas; Germinação; Lipídeos; Cromatografia gasosa.
Ano: 2023
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6850

Respuesta del pimiento morrón al secado parcial de la raíz y sustratos en hidroponía e invernadero.
Provedor de dados: 32
Autores: Chamú Baranda, Juan Antonio.
La sobre explotación de los acuíferos en México requiere estrategias eficientes en la aplicación y ahorro del agua para la sustentabilidad de los cultivos hortícolas. Así, el objetivo de la presente investigación fue evaluar el efecto de dos niveles de humedad aprovechable residual (HAR) y dos sustratos bajo la técnica de secado parcial de la raíz (SPR) en comparación con riego convencional sobre la fisiología, crecimiento, rendimiento, calidad del fruto y eficiencia en el uso del agua en plantas de pimiento morrón Cannon F1. El experimento se estableció del 15 de abril al 12 de julio de 2010 en condiciones de hidroponía e invernadero, en el Campus Montecillo del Colegio de Postgraduados, México. Los tratamientos se distribuyeron bajo un diseño...
Palavras-chave: Capsicum annuum L.; Relaciones hídricas; Intercambio de gases; Eficiencia en el uso del agua; Water relations; Gas exchange; Water use efficiency; Maestría; Hidrociencias.
Ano: 2010
URL: http://hdl.handle.net/10521/219

Caracterización fisiológica y productiva de dos variedades mexicanas de fresa (Fragaria x Ananassa) para el subtrópico.
Provedor de dados: 32
Autores: Estrada Nolasco, Celia.
Se estudiaron parámetros fisiológicos y de rendimiento de cuatro distintas variedades de fresa (Fragaria x anannassa Duch.), dos variedades mexicanas CP Zamorana (CP 02-01) y CP Jacona (CP 02-04) y dos variedades comerciales extranjeras (Festival y Giant). La evaluación se llevó a cabo en el periodo de otoño 2009. Se midieron variables de crecimiento, de producción y variables fisiológicas El comportamiento de la transpiración (TT), conductancia estomática (CE) y la tasa de fotosíntesis neta (TF) varió durante el periodo de cosecha. Las variedades Zamorana y Jacona presentaron las mayores TF en comparación a las variedades introducidas. Así, las TF fueron mayores para la variedad Jacona, seguida de Zamorana, Festival y Giant. Las diferencias en TF entre...
Palavras-chave: Intercambio de gases; Crecimiento; Producción; Rendimiento; Fragaria x ananassa; Gas exchange; Growth; Yield; Strawberry; Maestría; Fruticultura.
Ano: 2011
URL: http://hdl.handle.net/10521/391

Sombra artificial y aplicación de thidiazurón en el crecimiento y fisiología de la vainilla (Vanilla planifolia Andrews).
Provedor de dados: 32
Autores: Olivares Soto, Héctor Miguel.
El objetivo de esta investigación es documentar el efecto de diferentes niveles de sombra artificial y la aplicación de TDZ sobre el número y crecimiento de brotes laterales, en la producción y distribución de la materia seca en la planta de vainilla así como el efecto en parámetros fisiológicos del intercambio de gases. Para ello, se trabajó con esquejes de vainilla, con ocho yemas. Los  niveles de sombra fueron 30, 50 y 70 %  y  0, 500  y 1000 mg-litro-1 de Thidiazurón. Se midió longitud  y diámetro de brotes, número de hojas, tasa de fotosíntesis aparente (FA), transpiración (Tr), conductancia estomática (CE), concentración intercelular de CO2 (CINT), área foliar total por planta y la distribución de peso seco a en los componentes de la planta.  No hubo...
Palavras-chave: Vanilla planifolia A.; Regulador de crecimiento; Longitud de brote; Intercambio gaseoso; Area foliar; Fotosíntesis; Materia seca; Vanilla planifolia Andrews; Growth regulator; Shoot length; Gas exchange; Total upper leaf surface; Photosynthesis; Dry mass; Maestría; Fruticultura.
Ano: 2010
URL: http://hdl.handle.net/10521/252

Respuesta del pimiento morrón al secado parcial de la raíz y sustratos en hidroponía e invernadero.
Provedor de dados: 32
Autores: Chamú Baranda, Juan Antonio.
La sobre explotación de los acuíferos en México requiere estrategias eficientes en la aplicación y ahorro del agua para la sustentabilidad de los cultivos hortícolas. Así, el objetivo de la presente investigación fue evaluar el efecto de dos niveles de humedad aprovechable residual (HAR) y dos sustratos bajo la técnica de secado parcial de la raíz (SPR) en comparación con riego convencional sobre la fisiología, crecimiento, rendimiento, calidad del fruto y eficiencia en el uso del agua en plantas de pimiento morrón Cannon F1. El experimento se estableció del 15 de abril al 12 de julio de 2010 en condiciones de hidroponía e invernadero, en el Campus Montecillo del Colegio de Postgraduados, México. Los tratamientos se distribuyeron bajo un diseño...
Palavras-chave: Capsicum annuum L.; Relaciones hídricas; Intercambio de gases; Eficiencia en el uso del agua; Water relations; Gas exchange; Water use efficiency; Maestría; Hidrociencias.
Ano: 2010
URL: http://hdl.handle.net/10521/219

Respuestas morfológicas y fisiológicas de Rhizophagus intraradices y Medicago sativa ante contaminación por diésel.
Provedor de dados: 32
Autores: Hernández Ortega, Herminia Alejandra.
Este estudio evaluó el crecimiento, cambios morfológicos, actividades fisiológicas y expresión de genes en Medicago sativa en respuesta al estrés por la contaminación con diésel, y por la inoculación del hongo micorrízico arbuscular Rhizophagus intraradices. Este trabajo fue dividido en cuatro capítulos que describen cuatro diferentes fases experimentales. El primer capítulo describe el efecto del diésel en el desarrollo y colonización de R. intraradices. El segundo capítulo presenta resultados relacionados con el crecimiento y la expresión de genes en respuesta al estrés oxidativo generado por la contaminación con diésel en M. sativa. El tercer capítulo describe los cambios anatómicos e hidráulicos de las plantas de M. sativa en presencia de diésel. El...
Palavras-chave: Cambios anatómicos; Estrés oxidativo; Expresión génica; Intercambio gaseoso; Anatomical changes; Oxidative stress; Gene expression; Gas exchange; Edafología; Doctorado.
Ano: 2014
URL: http://hdl.handle.net/10521/2265

Stomatal frequency and gas exchange differs in two Blechnum species (Pteridophyta, Blechnaceae) with contrasting ecological breadth
Provedor de dados: 73
Autores: Atala,Cristian; Saldaña,Alfredo; Navarrete,Eduardo.
In Chilean temperate forest, the fern Blechnum chilense has a wide ecological breath, but occur mainly in full sun habitats, while Blechnum mochaenum is restricted only to shady sites. We evaluated if the species with different ecological breath behave similarly in their anatomical and physiological traits. Maximal photosynthetic rate (Amax), Stomatal conductance (g s), evapotranspiration (E), and SLA (specific leaf area) were measured in situ in 20 individuals of each fern species. Additionally, we estimated the stomatal density (SD), stomatal index (SI), and stomatal size in leaves of each sampled individual. B. mochaenum, the shade-tolerant species, had lower SD, SI, A, and E, and higher stomatal size and SLA than B. chilense. Higher stomatal frequency...
Tipo: Journal article
Palavras-chave: Blechnum; Stomatal density; Stomatal index; Stomatal size; Gas exchange; Evergreen temperate forest.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100016

Tomato production in hydroponic system using different agrofilms as greenhouse cover
Provedor de dados: 75
Autores: Marques,Douglas José; Matheus Filho,Edmur; Bianchini,Hudson C; Veroneze Junior,Valdir; Santos,Breno Régis; Carlos,Lanamar de A; Silva,Ernani Clarete da.
ABSTRACT Protected cultivation has increased over the years. More studies on the benefits of using photoselective agrofilms are necessary. The choice of material to cover the greenhouse is a decisive factor for crop development and production. The aim of this study was to evaluate the effect of diffuser and blue-colored agrofilms on the production of different tomato cultivars of indeterminate growth habit under NFT hydroponic system. A completely randomized design in a 2x3 factorial scheme (two environments and three cultivars) was used: two agrofilm types (blue and diffuser) and 3 cultivars (Monterrey, Arendell and Totalle). Each plot consisted of 30 plants per treatment, with four replicates. Commercial tomato seedlings of indeterminate growth habit...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycopersicon esculentum; Lycopene; Gas exchange; Radiation.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000100058

Physiological potential of onion seeds stored in different packings and environments
Provedor de dados: 75
Autores: Hornke,Nander F; Gadotti,Gizele I; Capilheira,André F; Cavalcante,Jerffeson A; Nadal,Ariele P; Silva,Joseano G.
ABSTRACT Storage is a fundamental step for maintaining seed quality after processing. Thus, in this study, we evaluated the physiological potential of onion seeds stored in different packings and environments. Impermeable, semi-permeable and permeable packings were tested under natural environment conditions (+19ºC), cold and dry chamber (10±2ºC and 33% RH) and cold chamber (16±2ºC and 60% RH), at 0, 90, 180, 270 and 360 days. The design was completely randomized in a 3x3x5 factorial scheme, with three replicates. In order to evaluate emergency in field, a 3x3 factorial arrangement (packing x environment) was adopted. Onion seeds maintained their physiological quality when stored in impermeable packing for 360 days, regardless of the environment. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allium cepa; Hermetic packages; Gas exchange.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362020000300312

Photosynthetic characteristics in species and interspecific hybrids of tomato
Provedor de dados: 75
Autores: Zeist,André R; Resende,Juliano TV; Faria,Marcos V; Gabriel,André; Adriano,Elisa; Lima Filho,Renato B.
ABSTRACT Gas exchanges in species and interspecific hybrids of tomato in different environments may contribute to the development and selection of genotypes with a higher tolerance to adverse cultivation conditions. This study aimed to assess the photosynthetic characteristics of wild tomato species and the cultivar Redenção, as well as the respective F1 hybrids of interspecific crosses cultivated under two environments. The experimental design was a randomized block design with three replications and the assessment of six wild accessions, one cultivar, and the respective interspecific hybrids under two environments. At 14, 28, 42, 56, and 70 days after transplanting (DAT), gas exchange characteristics were assessed by means of a portable photosynthesis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Wild accessions; Pre-breeding; Gas exchange.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000300362

Air-sea CO2 flux variability in frontal regions of the Southern Ocean from CARbon Interface OCean Atmosphere drifters
Provedor de dados: 5
Autores: Boutin, Jacqueline; Merlivat, L.; Henocq, C.; Martin, Nicolas; Sallee, Jean-baptiste.
Nine CARbon Interface OCean Atmosphere (CARIOCA) drifters were deployed in the Southern Ocean (south of the subtropical front, STF) between 2001 and 2006. They recorded 65 months of measurements in all seasons between 57 degrees S and 40 degrees S. Hydrological fronts detected by altimetry indicate that one buoy explored the polar zone (PZ) of the Atlantic Ocean and the western Indian Ocean; the remaining buoys explored the northern and southern parts of the subantarctic zone (SAZ) from the mid-Indian Ocean (73 degrees E) to the eastern Pacific Ocean (112 degrees W). The air-sea CO2 fluxes along the buoy trajectories are primarily driven by the spatial variability of the fugacity of CO2 in seawater, fCO(2): in the SAZ, they vary between -1.1 and -4.2 mol...
Tipo: Text
Palavras-chave: Antarctic circumpolar current; Northwestern mediterranean sea; Atlantic sector; Surface water; Gas exchange; Polar front; Temperature; Seawater; Transport.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00204/31483/29880.pdf

Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest
Provedor de dados: 5
Autores: Verryckt, Lore T.; Van Langenhove, Leandro; Ciais, Philippe; Courtois, Elodie A.; Vicca, Sara; Peñuelas, Josep; Stahl, Clément; Coste, Sabrina; Ellsworth, David S.; Posada, Juan M.; Obersteiner, Michael; Chave, Jérôme; Janssens, Ivan A.
Measuring leaf gas exchange from canopy leaves is fundamental for our understanding of photosynthesis and for a realistic representation of carbon uptake in vegetation models. Since canopy leaves are often difficult to reach, especially in tropical forests with emergent trees up to 60 m at remote places, canopy access techniques such as canopy cranes or towers have facilitated photosynthetic measurements. These structures are expensive and therefore not very common. As an alternative, branches are often cut to enable leaf gas exchange measurements. The effect of branch excision on leaf gas exchange rates should be minimized and quantified to evaluate possible bias. We compared light‐saturated leaf net photosynthetic rates measured on excised and intact...
Tipo: Text
Palavras-chave: Branch cutting; Canopy physiology; French Guiana; Gas exchange; Photosynthesis; Rainforest; Stomatal conductance.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00613/72466/71949.pdf

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange
Provedor de dados: 5
Autores: Legoix, Ludovic; Ruffine, Livio; Deusner, Christian; Haeckel, Matthias.
This article presents gas hydrate experimental measurements for mixtures containing methane (CH 4 ), carbon dioxide (CO 2 ) and nitrogen (N 2 ) with the aim to better understand the impact of water (H 2 O) on the phase equilibrium. Some of these phase equilibrium experiments were carried out with a very high water-to-gas ratio that shifts the gas hydrate dissociation points to higher pressures. This is due to the significantly different solubilities of the different guest molecules in liquid H 2 O. A second experiment focused on CH 4 -CO 2 exchange between the hydrate and the vapor phases at moderate pressures. The results show a high retention of CO 2 in the gas hydrate phase with small pressure variations within the first hours. However, for our system...
Tipo: Text
Palavras-chave: Gas hydrates; CH4; CO2; N-2; High-pressure experiments; Phase equilibrium; Gas exchange.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00452/56345/57935.pdf

Photosynthetic performance of contrasting Jatropha curcas genotypes during the flowering and fruiting stages
Provedor de dados: 86
Autores: Domiciano,Gisele Pereira; Kobayashi,Adilson Kenji; Molinari,Hugo Bruno Correa; Laviola,Bruno Galveas; Alves,Alexandre Alonso.
Abstract: The objective of this work was to evaluate physiological processes in contrasting physic nut (Jatropha curcas) genotypes during the flowering and fruiting stages. Gas exchange parameters were measured using an infrared gas analyzer, and morphological traits were evaluated during each stage under natural conditions, in a randomized complete block design with five replicates. Differences in yield between J. curcas accessions were not related to photosynthetic performance, but rather to the number of inflorescences and female flowers, which are genetically determined. Moreover, the net CO2 assimilation was equivalent in both genotypes, although they produced different amount of fruit. The genotypes differed consistently in terms of carboxylation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Biodiesel; Carboxylation efficiency; Gas exchange; Photosynthetic capacity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100010

Somatic embryogenesis and plant regeneration in elite clones of Theobroma cacao
Provedor de dados: 86
Autores: Silva,Thiago Édson Ribeiro da; Cidade,Luciana Cardoso; Alvim,Fátima Cerqueira; Cascardo,Júlio Cézar de Mattos; Costa,Marcio Gilberto Cardoso.
The objective of this work was to evaluated a procedure for somatic embryogenesis and regeneration of cacao (Theobroma cacao L.) elite clones. Petal explants from cacao clones TSH 565 and TSH 1188 were cultured on PCG and SCG-2 media, for calli growth. Somatic embryos were formed on the surface of embryogenic calli after transfer to embryo development (ED) medium. Clone TSH 565 showed a higher embryogenic potential than TSH 1188. The best combination of carbon source for embryo induction in ED medium was genotype-specific. Embryogenic callus formations increased in micropore tape-sealed Petri dishes, irrespective of cacao genotype. Mature somatic embryos were successfully converted into plantlets.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biotechnology; Cacao; Gas exchange; Micropropagation; Morphogenesis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001000024

Physiological parameters of cowpea treated with CaO-based particle film and subjected to water restriction
Provedor de dados: 86
Autores: Oliveira Júnior,Luiz Fernando Ganassali de; Santos,Patrícia Lima de Souza; Lima,Roberta Samara Nunes de; Silveira,Maria Priscilla Celestino; Fagundes,Jailson Lara; Carnelossi,Marcelo Augusto Gutierrez; Reis,Fabrício de Oliveira.
Abstract: The objective of this work was to evaluate the effects of CaO-based particle film on the physiological parameters of cowpea (Vigna unguiculata) subjected to water restriction. Plants were subjected to two levels of soil moisture and three concentrations of the film, as follows: control, without film + 100% crop evapotranspiration (ETc); without film + 50% ETc; 5% CaO + 50% ETc; 10% CaO + 50% ETc; 5% CaO + 100% ETc; and 10% CaO + 100% ETc. Plants treated with 50% ETc remained stable with the application of 10% CaO particle film and showed high photosynthetic assimilation of CO2 (32 μmol m-2 s-1), moderate transpiration (5.6 mmol m-2 s-1), maintenance of chlorophyll content, and greater intrinsic water-use efficiency (IWUE, 226.65 μmol mol-1) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Calcium; Gas exchange; Water deficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102201

Photosynthetic responses of young cashew plants to varying environmental conditions
Provedor de dados: 86
Autores: Souza,Rogéria Pereira de; Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de; Silveira,Joaquim Albenísio Gomes da.
The aim of this study was to characterize gas exchange responses of young cashew plants to varying photosynthetic photon flux density (PPFD), temperature, vapor-pressure deficit (VPD), and intercellular CO2 concentration (Ci), under controlled conditions. Daily courses of gas exchange and chlorophyll a fluorescence parameters were measured under natural conditions. Maximum CO2 assimilation rates, under optimal controlled conditions, were about 13 mmol m-2 s-1 , with light saturation around 1,000 mmol m-2 s-1. Leaf temperatures between 25ºC and 35ºC were optimal for photosynthesis. Stomata showed sensitivity to CO2, and a closing response with increasing Ci. Increasing VPD had a small effect on CO2 assimilation rates, with a small decrease above 2.5 kPa....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anacardium occidentale; Gas exchange; Chlorophyll fluorescence; Temperature; Vapor-pressure deficit.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000800002

Physiological responses of maize and cowpea to intercropping
Provedor de dados: 86
Autores: LIMA FILHO,JOSÉ MOACIR PINHEIRO.
The effect of intercropping on plant water status, gas exchange and productivity of maize (Zea mays L.) cv. Centralmex, and cowpea (Vigna unguiculata L. (Walp)) cv. Pitiuba were evaluated under semi-arid conditions at the Embrapa-Centro de Pesquisa Agropecuária do Trópico Semi-Árido (CPATSA) at Petrolina, PE, Brazil. The treatments were: maize and cowpea as sole crops, at a population of 40,000 plants ha-1, and intercropped at a population of 20,000 plants ha-1. The results obtained in this paper appear to be related to the degree of competition experienced by the components, mainly for water and light. Maize intercropped had higher values of leaf water potential, stomatal conductance, transpiration and photosynthesis than as sole crop. Intercropped cowpea...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant soil relations; Plant water relations; Gas exchange; Cropping systems.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000000500008

Performance of soybean in hydromorphic and nonhydromorphic soil under irrigated or rainfed conditions
Provedor de dados: 86
Autores: Rocha,Thiago Schmitz Marques da; Streck,Nereu Augusto; Zanon,Alencar Junior; Marcolin,Elio; Petry,Mirta Teresinha; Tagliapietra,Eduardo Lago; Barlest,Darlan; Bexaira,Kelin Pribs.
Abstract: The objective of this work was to evaluate soybean cultivation in a hydromorphic or nonhydromorphic soil, with or without supplemental irrigation. Field experiments were carried out with the TECIRGA 6070RR and A 6411RG cultivars in highlands (nonhydromorphic soils) and lowlands (hydromorphic soils), which are traditionally cultivated with irrigated rice. The following parameters were determined in both soybean cultivars: leaf area index, developmental stages, dry matter partition, and leaf gas exchange. Low water stresses, which commonly occur either by deficit or excess in soybean areas cultivated in hydromorphic soils, do not affect the development and partitioning of dry matter; however, they cause reductions in stomatal conductance,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Gas exchange; Irrigation; Lowlands.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000500293

Environmental effects on photosynthetic capacity of bean genotypes
Provedor de dados: 86
Autores: Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Souza,Gustavo Maia; Machado,Eduardo Caruso; Oliveira,Ricardo Ferraz de; Angelocci,Luiz Roberto; Pimentel,Carlos.
Photosynthetic responses to daily environmental changes were studied in bean (Phaseolus vulgaris L.) genotypes 'Carioca', 'Ouro Negro', and Guarumbé. Light response curves of CO2 assimilation and stomatal conductance (g s) were also evaluated under controlled (optimum) environmental condition. Under this condition, CO2 assimilation of 'Carioca' was not saturated at 2,000 µmol m-2 s-1, whereas Guarumbé and 'Ouro Negro' exhibited different levels of light saturation. All genotypes showed dynamic photoinhibition and reversible increase in the minimum chlorophyll fluorescence yield under natural condition, as well as lower photosynthetic capacity when compared with optimum environmental condition. Since differences in g s were not observed between natural and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Chlorophyll fluorescence; Gas exchange; Photosynthesis.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000700001

Biomasa acumulada e intercambio gaseoso en maíz proveniente de semilla de diferente tamaño bajo humedad favorable y restringida: (con 3 tablas)
Provedor de dados: 85
Autores: López-Santillán,José Alberto; Castro-Nava,Sergio; Trejo-López,Carlos; Mendoza-Castillo,Ma. Del Carmen; Ortiz-Cereceres,Joaquín.
Se evaluó la velocidad de germinación y el crecimiento de plántulas de maíz provenientes de semilla de dos diferentes tamaños para determinarlas diferencias en la producción de biomasa durante la etapa vegetativa y estimar los efectos de una condición diferente de disponibilidad de humedad sobre el estatus fisiológico de la plántula. Una mayor cantidad de biomasa en el endospermo y en el embrión de las semillas permitió una mayor disponibilidad de reservas durante la etapa posterior a la germinación y anterior a la emergencia, dando como resultado un mayor vigor inicial en las plántulas evaluadas, y en consecuencia una mayor acumulación de biomasa, tanto radical como aérea, durante la etapa vegetativa. La presencia de una restricción de humedad durante la...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Maize; Seed size; Seedling vigor; Biomass; Drought; Gas exchange.
Ano: 2004
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100030

Soil drying rate and gas exchange of three Phaseolus vulgaris L. varieties
Provedor de dados: 85
Autores: Aguirre-Medina,JF; Kohashi-Shibata,J; Cadena-Iñiguez,J; Avendaño-Arrazate,C.
Intermittent drought is the main limiting factor for bean production in Mexico. The root system of three bean varieties of different origin and tolerance to water stress was exposed to different drying soil rates. The synthetic varieties were: Pinto Villa (PV, water stress tolerant) and Bayo Madero (BM, water stress susceptible) both of mesoamerican origin and growth habit type III (climbing habit), and ICA Palmar (water stress tolerant) of Andean origin and growth habit type I (shrub). Treatments were three soil drying rates, which were achieved by stopping irrigation and either maintaining or removing the pot cover made with PVC tubes in a split root system. Gas exchange was studied during 32 h. Slow soil drying rate (with cover) generated a gradual...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Rate of soil drying; Gas exchange; Soil water potential.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572008000100004

Photosynthetic Performance of Glyphosate Resistant and Glyphosate Susceptible Hairy Fleabane under Light Intensity
Provedor de dados: 87
Autores: SILVA,D.R.O.; VARGAS,L.; AGOSTINETTO,D.; SANTOS,F.M.
ABSTRACT: Herbicide resistance can confer lower competitive abilities; however scarse information is available about the photosynthetic performance between glyphosate-resistant and -susceptible hairy fleabane biotypes coming from areas with similar weed management history. Thus, the goal was to evaluate the photosynthetic performance under different light intensities between glyphosate-resistant and -susceptible hairy fleabane biotypes, from RR soybean fields with a similar weed management history. The tested factors were glyphosate resistant and susceptible biotypes and 12 levels of photosynthetic photon flux density. Plants were cultivated in plastic cups, and at the stage of 10-12 leaves they were subjected to treatments with artificial lighting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conyza bonariensis; Ecological adaptability; Photosynthetic photon flux; Carbon assimilation rate; Gas exchange; Light response curve.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100285

Directed-spray application of paraquat and diuron in physic nut plants
Provedor de dados: 87
Autores: Costa,N.V.; Neunfeld,T.H.; Ohland,T.; Piano,J.T.; Klein,J.
There is little information about the selectivity of herbicides in physic nut (Jatropha curcas) in Brazil. Therefore, this study aimed to evaluate the selectivity of different doses and mixtures of paraquat and diuron in direted-spray applications in physic nut plants in greenhouse conditions. The study used a randomized block design, with five replicates. The treatments were: paraquat (200 and 600 g ha-1), diuron (1,000 and 2,000 g ha-1), paraquat + diuron (200 + 1,000 g ha-1), paraquat + diuron (200 + 2,000 g ha-1), paraquat + diuron (600 + 1,000 g ha-1), paraquat + diuron (600 + 2,000 g ha-1) and a control (no application). Directed-spray application was performed at 70 days after sowing by the lower third of the plants. The treatments of diuron and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Weed; Chemical control; Gas exchange.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400025

Intoxication of Mesotrione in Corn Inoculated with Azospirillum brasilense and with Application of Plant Growth Regulators
Provedor de dados: 87
Autores: BULEGON,L.G.; GUIMARÃES,V.F.; BATTISTUS,A.G.; COSTA,N.V.
ABSTRACT: The objective of this study was to evaluate the effect of intoxication by mesotrione herbicide on the initial development and yield of maize after seed inoculation or foliar spray application with Azospirillum brasilense and application of plant regulators. Therefore, three experiments were performed: one under greenhouse conditions and two under field conditions, in different locations. In all experiments, a randomized block design was used with a 2 x 4 factorial arrangement, representing presence (192 g ha-1) or absence of mesotrione and four treatments corresponding to the control; seed inoculation with A. brasilense; foliar spray application of A. brasilense; foliar spay application of auxin + gibberellin + cytokine (AX + GA + CK), and foliar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Gas exchange; Fluorescence of chlorophyll a; Peroxidase; Catalase.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100257

Does Spraying of Atrazine on Triazine-Resistant Canola Hybrid Impair Photosynthetic Processes?
Provedor de dados: 87
Autores: DURIGON,M.R.; CAMERA,A.S.; CECHIN,J.; VARGAS,L.; CHAVARRIA,G.
ABSTRACT: Canola is an important rotation crop for the winter season and the use of atrazine-resistant hybrids can lead to an increase in yield. This work was aimed at evaluating the effect of atrazine on photochemical and biochemical processes of photosynthesis in triazine-resistant canola. The experiment was conducted in a greenhouse, with triazine-resistant hybrid Hyola® 555TT, in a randomized block design with three replications. The treatments consisted of application or no application of atrazine on canola plants. The plants were assessed at one, three, five, and eight days after application (DAA) for chlorophyll indexes, modulated chlorophyll a fluorescence and gas exchange. Chlorophyll indexes were higher in canola plants treated with atrazine....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica napus; Chlorophyll indexes; Gas exchange; Modulated fluorescence.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100284

Physiological Variables in Pineapples Submitted to the Application of Diuron
Provedor de dados: 87
Autores: CARVALHO,A.R.J.; MAIA,V.M.; ASPIAZÚ,I.; PEGORARO,R.F.; OLIVEIRA,F.S.
ABSTRACT Diuron is a widely used herbicide on pineapple cultivations. However, its application is recommended only for the implementation of the crop. The objective of this work was to evaluate the gas exchanges of four pineapple cultivars submitted to the application of the herbicide diuron at their reproductive stage. The experiment was conducted with the IAC Fantástico, Vitória, MD2 and Pérola pineapple cultivars using the active ingredient diuron at a dose of 7.5 mL L-1. Measurements of CO2 assimilation rate, stomatal conductance, transpiration, vapor pressure deficit and water use efficiency were carried out weekly, by the hour, on two plants per cultivar, over a 24 hour period. These determinations were carried out two days before the application of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ananas comosus var. comosus; Herbicide; Gas exchange; Weeds; Chemical control.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100316

Photosynthetic responses of tropical tree species from different successional groups under contrasting irradiance conditions
Provedor de dados: 88
Autores: Ribeiro,Rafael V; Souza,Gustavo M; Oliveira,Ricardo F; Machado,Eduardo C.
This study evaluated the photosynthetic responses of seven tropical trees of different successional groups under contrasting irradiance conditions, taking into account changes in gas exchange and chlorophyll a fluorescence. Although early successional species have shown higher values of CO2 assimilation (A) and transpiration (E), there was not a defined pattern of the daily gas exchange responses to high irradiance (FSL) among evaluated species. Cariniana legalis (Mart.) Kuntze (late secondary) and Astronium graveolens Jacq. (early secondary) exhibited larger reductions in daily-integrated CO2 assimilation (DIA) when transferred from medium light (ML) to FSL. On the other hand, the pioneer species Guazuma ulmifolia Lam. had significant DIA increase when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Flexibility response; Functional groups; Gas exchange; High irradiance.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000100012

Poultry Egg Incubation: Integrating and Optimizing Production Efficiency
Provedor de dados: 89
Autores: Boleli,IC; Morita,VS; Matos Jr,JB; Thimotheo,M; Almeida,VR.
ABSTRACT Due to its central position in the production chain, in-ovo development is influenced by pre-incubation factors that affect the quality of embryonated eggs and incubation conditions themselves, and both may influence egg hatchability and chick quality, as well as bird survival, growth performance, and phenotype in the field. The evolution of the incubation process over the years is characterized by significant scientific and technological development. Presently, the main current focuses of research are the manipulation of thermal incubation conditions, eggshell temperature, and the integrated effects of factors that influence incubation. In this context, one of the questions that needs to be asked is how effective are the current physical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gas exchange; Heat transfer; Incubation conditions; Incubation management; Physics of incubation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2016000600001

Differential Behavior of Young Eucalyptus Clones in Response to Nitrogen Supply
Provedor de dados: 90
Autores: Ferreira,Eric Victor de Oliveira; Novais,Roberto Ferreira; Pereira,Greice Leal; Barros,Nairam Félix de; Silva,Ivo Ribeiro da.
Eucalyptus requires large amounts of nitrogen (N); however, it responds in diverse manners to the application of this nutrient. The aim of this study was to evaluate the differential performance in growth, mineral nutrition, and gas exchanges of N-fertilized Eucalyptus clones. The treatments consisted of two Eucalyptus clones (VM-01 and I-144) and six N application rates (0, 0.74, 2.93, 4.39, 5.85, and 8 mmol L-1 NH4NO3) arranged in a randomized complete block design with five replications. VM-01 had greater plant height and greater height/collar diameter ratio, as well as higher leaf concentrations of all macronutrients and of Cu, Fe, Mo, and Zn. In terms of total and root dry matter production, root/shoot ratio, and collar diameter, as well as stomatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gas exchange; Growth; Nutrient solution; Nutritional efficiency.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000300809

Silicon and boron mitigate the effects of water deficit on sunflower
Provedor de dados: 91
Autores: Neves,Jose M. G.; Aquino,Leonardo A. de; Berger,Paulo G.; Neves,Júlio C. L.; Rocha,Genelício C.; Barbosa,Edimilson A.
ABSTRACT The objective of this study was to evaluate the effect of Ca and Mg silicate and B on the gas exchange, leaf water potential and chlorophyll fluorescence parameters in the sunflower variety Embrapa 122 -V2000 under water stress conditions. The trial was conducted in Red Yellow Latosol with very clayey texture, with contrasting levels of Si and B and subjected to water deficit. The experimental design was randomized blocks in a 24 factorial arrangement, with five replicates. Treatments consisted of the combination of two acidity corrective agents (calcium magnesium silicate and dolomitic limestone), two levels of base saturation (30 and 70%), two levels of B (0.18 mg dm-3 - value available in the soil and 1.20 mg dm-3) and two water regimes (with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Helianthus annuus; Chlorophyll fluorescence; Gas exchange; Leaf water potential.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300175

Expression of NCED gene in colored cotton genotypes subjected to water stress
Provedor de dados: 91
Autores: Souza,Alexandre M. S. de; Batista,Vandré G. L.; Pinheiro,Morganna P. N.; Suassuna,Janivan F.; Lima,Liziane M. de; Fernandes,Pedro D.
ABSTRACT Considering that the NCED gene acts on the biosynthetic cascade of ABA, a hormone involved in the functioning of stomata and consequently in the regulation of transpiration, the aim of this research was to analyze the expression of this gene in colored cotton genotypes subjected to water stress at the beginning of plant growth. Four colored cotton genotypes were used, subjected to two managements, with and without water stress, beginning the treatments when the blade of the first true leaves reached an area that allowed the evaluation of gas exchange. For the studies of the expression of the NCED gene, via RT-qPCR, leaves were collected on three distinct dates: at 4 and 6 days of water stress, and after the plants regained their turgor. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gossypium hirsutum L.; Gas exchange; Semi-quantitative RT-PCR; QRT-PCR.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800692

Physiological attributes of jatropha under different planting densities and nitrogen doses
Provedor de dados: 91
Autores: Campos,Allan R. F.; Lima,Rosiane L. S. de; Azevedo,Carlos A. V. de; Nascimento,Ronaldo do; Silva,Sonivagno S.
ABSTRACT Nitrogen (N) fertilization associated with planting density is a practice that can improve the physiological aspects and consequently increase the yield of a crop. Thus, this study aimed to evaluate the effects of planting density and N levels on the physiological aspects of jatropha in the ‘Agreste’ region of Paraíba. Treatments consisted of four planting densities (833, 1,111, 1,666 and 2,500 plants ha-1) representing the plots and five N doses (0, 40, 80, 120 and 180 kg ha-1) corresponding the subplots. The effects of treatments on CO2 assimilation rate, internal CO2 concentration, transpiration, stomatal conductance, water use efficiency, instantaneous carboxylation efficiency and SPAD index were analysed. Except for stomatal conductance, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Gas exchange; Nitrogen fertilizer; Water use efficiency.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016001201112

Physiological characteristics of citrus plants infested with citrus blackfly
Provedor de dados: 92
Autores: Gomes,Alirya Magda Santos do Vale; Reis,Fabrício de Oliveira; Lemos,Raimunda Nonata Santos de; Mondego,Janaína Marques; Braun,Heder; Araujo,José Ribamar Gusmão.
Abstract Aleurocanthus woglumi (Ashby, 1915) is an important agricultural pest that causes yield losses of 20-80% in citrus plants by removing plant nutrients while feeding and allowing the formation of sooty mold. The objective of this study was to evaluate physiological changes in citrus plants in response to A. woglumi infestation under field conditions. The experiment was conducted in a citrus orchard in Paço do Lumiar, Maranhão, Brazil. Thirty-two citrus plants were used, including eight of each of the following varieties: Tahiti lime, Tanjaroa tangerine, Nissey tangerine, and Ponkan tangerine. Four random plants with A. woglumi infestation and four plants free from this pest were selected from each variety. The physiological parameters evaluated were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aleurocanthus woglumi; Citrus latifolia; Gas exchange; Photochemical efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262019000200119

Physiology and quality of Eugenia dysenterica DC seedlings grown in vermiculite and rice husk-based substrates
Provedor de dados: 94
Autores: Mota,Clenilso Sehnen; Araújo,Eduard Lucas Souza; Silva,Fabiano Guimarães; Dornelles,Paulo; Freiberger,Mariângela Brito; Mendes,Giselle Camargo.
Abstract Eugenia dysenterica DC is a fruiting species endemic to the Brazilian Cerrado, belonging to the Myrtaceae family and popularly known as Cagaiteira. It has medicinal and antifungal properties, and has an important function in the ecosystem. Nevertheless, there are few studies about the maintenance of this species. The aim of this study was to evaluate the growth, nutrition, quality and physiology of E. dysenterica seedlings grown in fine vermiculite and rice husk-based substrates in the following combinations: 1:0, 3:1, 1:1, and 1:3, in addition to Trimix® commercial substrate and vermiculite only. The physical attributes of substrates (dry and moist densities, available water, remaining water, aeration space and total porosity), seedling emergence...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cagaita; Gas exchange; Fluorescence; Quality index.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000101002

Physiological quality of sesame seeds produced from plants subjected to water stress
Provedor de dados: 124
Autores: Silva,Ronimeire Torres da; Oliveira,Alexandre Bosco de; Lopes,Maria de Fátima de Queiroz; Guimarães,Marcelo de Almeida; Dutra,Alek Sandro.
ABSTRACT Germination and seed vigor may be influenced by several factors, such as water stress during production, which affect crops differently according to the phenological stage of the plant. The aim of this study therefore was to evaluate the physiological quality of sesame seeds from plants subjected to water stress at different phenological stages. To this end, sesame plants were subjected to water stress at the following stages: I - germination to the start of vegetative growth (T1); II - vegetative growth to flowering (T2); III - flowering to pod formation (T3); IV - fruit maturation (T4); also for stress at all stages (T5) and full irrigation (T6). By weighing and daily irrigation of the containers, levels were kept at 50% of pot capacity (CV) for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sesamum indicum L; Water deficit; Phenology; Germination; Gas exchange.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000400643

Water relations and photosynthesis as criteria for adequate irrigation management in 'Tahiti' lime trees
Provedor de dados: 63
Autores: Silva,Cláudio Ricardo da; Folegatti,Marcos Vinícius; Silva,Tonny José Araújo da; Alves Júnior,José; Souza,Claudinei Fonseca; Ribeiro,Rafael Vasconcelos.
Irrigation scheduling based on soil moisture status is one of the most useful methods because of its practicality and low cost. The effects of available soil water depletion on evapotranspiration (ETc), transpiration (E), leaf water potential at predawn (psiP) and midday (psiM), stomatal conductance (gs) and net CO2 assimilation (A) in lime 'Tahiti' trees (Citrus latifolia) were evaluated to improve irrigation schedule and minimize water use without causing water stress. The trees were spaced 7 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 4 m and drip-irrigated by four drippers with the available soil water content (AWC) depleted by suspension of irrigation (40 days). Leaf water potential was measured on a pressure chamber (psiP and psiM) and leaf gas exchange...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Evapotranspiration; Citrus; Lysimeter; Gas exchange; Tensiometer.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000500001

Upland rice: phenotypic diversity for drought tolerance
Provedor de dados: 63
Autores: Lanna,Anna Cristina; Coelho,Gesimária Ribeiro Costa; Moreira,Alécio Souza; Terra,Thiago Gledson Rios; Brondani,Claudio; Saraiva,Gabriel Rios; Lemos,Frederico da Silva; Guimarães,Paulo Henrique Ramos; Morais Júnior,Odilon Peixoto; Vianello,Rosana Pereira.
ABSTRACT: Upland rice is cultivated mostly in Latin America and Africa by small farmers and in areas with risk of dry spells. This study evaluated morphophysiological mechanisms of upland rice associated to drought adaptation. A set of 25 upland rice genotypes were grown in a plant phenotyping platform during 2015 and 2017 under regular irrigation and water restriction. We evaluated morphophysiological traits in shoots (vegetative structures growth, gas exchange, water use efficiency, carboxylation efficiency, water status) and roots (length, surface area, volume and diameter), as well as agronomic traits (grain yield and its components). There was a reduction in grain yield by up to 54 % and 58 % in 2015 and 2017, respectively, under water deficit. Five...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain yield; Gas exchange; Water status; Root system; Vegetative morphology.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000500603

Salt stress induced damages on the photosynthesis of physic nut young plants
Provedor de dados: 63
Autores: Silva,Evandro Nascimento da; Ribeiro,Rafael Vasconcelos; Ferreira-Silva,Sérgio Luiz; Viégas,Ricardo Almeida; Silveira,Joaquim Albenisio Gomes.
Salinity is a major limiting factor to crop productivity in the world especially in semiarid regions. The aim of this study was to evaluate the photosynthetic resistance of Jatropha curcas (L.) young plants subjected to salt stress. The experiment was carried out in a completely randomized design with treatments in a 2 x 3 factorial: two NaCl levels (0 and 100 mmol L-1) and three harvest times: 7 and 14 days of salt exposure and three days of recovery. Leaf Na+ and Cl-concentrations and the K+/Na+ ratios, after seven days of salt exposure, did not reach ionic toxic levels, suggesting that the NaCl-induced osmotic effects prevailed over the ionic ones. Under this condition, the salt stress caused reduction in leaf gas exchange parameters, such as CO2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Chlorophyll fluorescence; Gas exchange; Ionic toxicity; Salinity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000100010

Irrigation frequency and substrate volume effects in the growth and yield of tomato plants under greenhouse conditions
Provedor de dados: 63
Autores: Pires,Regina Célia de Matos; Furlani,Pedro Roberto; Ribeiro,Rafael Vasconcelos; Bodine Junior,Décio; Sakai,Emílio; Lourenção,André Luiz; Torre Neto,André.
Tomato cropping (Solanum lycopersicum L.) under protected cultivation using substrates and drip fertigation has improved sustainable production systems especially fruit quality and plant health. However, little is known for tomato plants when considering the interaction between substrate volume and irrigation frequency. The aim of this study was to evaluate the effects of coconut (Cocos nucifera L.) fiber substrate volumes and drip irrigation frequencies on the vegetative growth and fruit yield of tomato plants under greenhouse conditions. The experimental design consisted of randomized blocks arranged in a 3 × 2 factorial with four replicates. Treatments consisted of three substrate volumes (5.0; 7.5 and 10.0 L per plant) and two irrigation frequencies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum L.; Fertigation; Gas exchange; Trickle irrigation; Water management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000400002

Energy, water vapor and carbon fluxes in Andean agroecosystems: conceptualization and methodological standardization
Provedor de dados: 109
Autores: Castano-Marín,Angela María; Riaño-Herrera,Nestor Miguel; Peña-Quiñones,Andrés Javier; Ramirez-Builes,Víctor Hugo; Valencia-Salazar,Arley; Figueroa-Casas,Apolinar; Góez-Vinasco,Gerardo Antonio.
Abstract This paper presents the conceptualization, methodological adjustment and experimental application of the micrometeorological technique eddy covariance - EC, to measure energy, water vapor and CO2 fluxes in two coffee agroecosystems: the first under full sunlight, and the second under shade, both with equatorial Andean hillslope conditions. With a footprint and fetch calculation, the required distance from the edge of the field in the prevailing wind direction to the EC tower is three times higher under shade than full sun. The shaded agroecosystem reached maximum average carbon fixation rates of 21.26 ± 2.469 μmolCO2.m-2s-1 (α = 0.05) (61% higher than under 100% sunlight) which gives a high carbon sink capacity to the association of coffee plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agroecosystem coffee; Andean hillslope; Eddy covariance; Energy fluxes; Gas exchange.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100027

PHOTOSYNTHETIC RESPONSE TO LOW AND HIGH LIGHT OF CACAO GROWING WITHOUT SHADE IN AN AREA OF LOW EVAPORATIVE DEMAND
Provedor de dados: 37
Autores: JAIMEZ,Ramon Eduardo; AMORES PUYUTAXI,Freddy; VASCO,Alfonso; Gastón LOOR,Rey; TARQUI,Omar; QUIJANO,Grisnel; JIMENEZ,Juan Carlos; TEZARA,Wilmer.
ABSTRACT Cacao (Theobroma cacao L.) breeding programmes in Ecuador have focused on obtaining high-yield clones with improved disease resistance. Cacao clones should also have photosynthetic characteristics which support increased productivity. Regarding the weather conditions at the coast of Ecuador, where most of the year there are overcasts and low air evaporative demand, there is the possibility to grow cacao without overhead shade. This study focused on the photosynthetic response at two different photosynthetic photon flux densities (PPFD) of Ecuadorian cacao clones. Seven-year old cacao clones were evaluated: eight clones of Nacional type and two commercial clones (CCN 51 and EET 103), used as controls. All clones showed an increase of 35 % on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cacao yield; Chlorophyll fluorescence; CO2 assimilation rate; Gas exchange.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2018000100095

Different physiological responses under drought stress result in different recovery abilities of two tropical woody evergreen species
Provedor de dados: 39
Autores: Frosi,Gabriella; Harand,Wolfgang; Oliveira,Marciel Teixeira de; Pereira,Silvia; Cabral,Simone Pereira; Montenegro,Abelardo Antônio de Assunção; Santos,Mauro Guida.
ABSTRACT The effects of water deficit on physiological and biochemical variables of young plants of two tropical woody species, Pachira aquatica and Sterculia foetida, and their recovery abilities were measured. Leaf water potential, gas exchange and selected carbon metabolism components were measured in a greenhouse experiment with control, moderate and severe water deficit treatments. Under severe drought stress, gas exchange and chlorophyll fluorescence decreased in both species compared to their respective controls. After rehydration, P. aquatica and S. foetida showed a partial and full recovery of the measured variables, respectively. In addition, a decrease and an increase in photosynthetic pigments were observed for P. aquatica and S. foetida,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Climate changes; Gas exchange; Semiarid; Water deficit.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000200153

Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil
Provedor de dados: 39
Autores: Rossatto,Davi Rodrigo; Kolb,Rosana Marta.
Gochnatia is very common in different phytophysiognomies in the Cerrado of São Paulo State, occupying open and closed areas. In this study, we compared the leaf anatomy and some ecophysiological traits of two species of Gochnatia, one a shrub (Gochnatia barrosii Cabrera) and the other a tree (Gochnatia polymorpha (Less.) Cabrera), which both occur in an area of "cerradão" at the Estação Ecológica de Assis, SP. We found qualitative structural differences between the species, with G. barrosii presenting amphistomatic leaves with a uniseriate epidermis and G. polymorpha showing hypostomatic leaves and a multiple epidermis or hypodermis on the adaxial surface. Moreover, the G. barrosii leaves had lower values in tissue thickness (with the exception of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Gas exchange; Leaf anatomy; Stomata.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000400014

Growth and photosynthetic responses during ex vitro acclimatization of Etlingera elatior (Jack) rm smith (torch ginger)
Provedor de dados: 1
Autores: Rodrigues, Marcelo; Paiva, Patrícia Duarte de Oliveira; Freitas, Rodrigo Therezan de; Mansur, Thaís de Oliveira Fontes; Paiva, Renato; Barbosa, João Paulo Rodrigues Alves Delfino.
Torch ginger (Etlingera elatior (Jack) RM Smith) can be propagated in vitro, but there is currently little information about the stages of acclimatization and adaptation for torch ginger in a greenhouse. The objective was to study the growth responses, survival and photosynthetic response during the acclimatization of plants maintained on three different substrates (Plantmax forestry®, sand and 1:1 Plantmax forestry® and sand) under three shading conditions (50% red and blue shading nets and control without shading nets). The highest leaf and shoot numbers per plant and survival rate were observed in treatments with the Plantmax forestry® type substrate in the absence of shading. In vitro culture plants behaved similarly or better than rhizome propagated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.00.00.00-4 torch ginger; Growth curve; Gas exchange; Photoautotrophy. 5.01.03.06-7.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19707

Photosynthetic pigments and gas exchange in castor bean under conditions of above the optimal temperature and high CO2
Provedor de dados: 1
Autores: Silva, Fabiola França; Mendes, Bruna Silva; Rocha, Maria Socorro; Brito Neto, José Félix; Beltrão, Napoleão Macêdo; Sofiatti, Valdinei.
The castor bean plant, a Euphorbiaceae oil seed C3-metabolism rustic and drought-resistant plant, is cultivated in a wide range of environments due to its good adaptive capacity. However, given the current environmental changes, many biochemical and physiological impacts may affect the productivity of important crops, such as castor bean. This work aimed to evaluate the impacts of the castor bean gas exchange in response to high temperature and increased CO2concentration.Our experiment was conducted in a phytotron located at Embrapa Algodão in 2010. We adopted a completely randomized design, with four treatments in a factorial combination of two temperatures (30/20 and 37/30°C) and two CO2 levels (400 and 800 mmol L-1); four replications were performed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.03.00-8 castor bean; Climate change; Gas exchange; Photosynthesis; Chlorophyllssíntese  clorofila 5.01.03.06-7.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/19075

Physiological and agronomical responses of Syrah grapevine under protected cultivation
Provedor de dados: 53
Autores: Souza,Claudia Rita de; Mota,Renata Vieira da; Dias,Frederico Alcântara Novelli; Melo,Evaldo Tadeu de; Pimentel,Rodrigo Meirelles de Azevedo; Souza,Laís Cristina de; Regina,Murillo de Albuquerque.
The performance of Syrah grapevine under protected cultivation with different plastic films was evaluated during 2012 and 2013 seasons in South of Minas Gerais State. Agronomical and physiological measurements were done on eight years old grapevines, grafted onto ‘1103 Paulsen’ rootstock cultivated under uncovered conditions, covered with transparent and with diffuse plastic films. Both plastic covers induced the highest shoot growth rate and specific leaf area. The diffuse plastic induced greater differences on leaf area, pruning weight and leaf chlorophyll content as compared to uncovered vines. Grapevines under diffuse plastic also had the lowest rates of photosynthesis, stomatal conductance and transpiration. Leaf starch, glucose and fructose contents...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vitis vinifera; Plastic cover; Vegetative vigor; Water relations; Gas exchange; Wine grape composition.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000300270

Changes in phenotypic variability of two tropical woody species due to short and long-term exposure to different irradiances
Provedor de dados: 53
Autores: Pereira,Silvia; Frosi,Gabriella; Oliveira,Marciel Teixeira de; Lustosa,Bruno Melo; Arruda,Emília Pereira; Santos,Mauro Guida.
ABSTRACT Studies addressing the physiological and anatomical responses of plants under different light intensities normally are performed in short term. Thus, the present study includes a long term analysis. This study aims to verify whether the phenotypic variability off attributes in two woody tropical specieis, Paquira aquatica and Sterculia foetida, are compatible both under short term exposure to different light availability levels (full-light and half-light local irradiance) and long-term exposure in the same conditions. The study was developed in two phases: phase I (short term) and phase II (long term). The variables measured were referent to CO2 assimilation responses to light intensity, chlorophyll a fluorescence, chlorophyll content,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll a fluorescence; Gas exchange; Plastic response; Light curve.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000300429

Ecophysiological leaf traits of native and exotic palm tree species under semi-arid conditions
Provedor de dados: 53
Autores: Oliveira,Deborah; Medeiros,Maria; Pereira,Silvia; Oliveira,Marciel; Frosi,Gabriella; Arruda,Emília; Santos,Mauro.
ABSTRACT The main goal of this study was to evaluate the performance of two palm species under semi-arid conditions during the rainy and dry periods: the semi-arid native Syagrus coronata and a native to tropical America, Acrocomia aculeata. The leaf water potential, gas exchange, leaf soluble sugars, starch, free amino acids, total soluble protein content and morphological traits were measured. The highest leaf water potential and CO2 assimilation values in both species were achieved during the rainy period. In response to the low soil moisture content during the dry period, gas exchange decreased 72 and 92% in S. coronata and A. aculeata, respectively, when compared with values from rainy period. As evergreen plants, both species maintained intact leaf...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acrocomia aculeata; Evergreen species; Gas exchange; Syagrus coronata; Water deficit.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000200128

Potassium-modulated physiological performance of mango plants infected by Ceratocystis fimbriata
Provedor de dados: 53
Autores: Cacique,Isaias Severino; Bispo,Wilka Messner Silva; Araujo,Leonardo; Aucique-Pérez,Carlos Eduardo; Rios,Jonas Alberto; Silva,Leandro Castro; Rodrigues,Fabrício Ávila.
ABSTRACT Mango wilt, caused by the fungus Ceratocystis fimbriata, is an important disease affecting mango production. In view of the beneficial effects of potassium (K) in other profitable crops and the lack of information about the effect of macronutrients on mango wilt development, the present study aimed to evaluate how mango plants supplied with K respond physiologically when infected by C. fimbriata. Mango plants (» 3 years old) from cultivar Ubá were grown in plastic pots containing 58 mg of K·dm−3 (original K level based on the chemical analysis of the substrate) or in plastic pots with substrate amended with a solution of 0.5 M potassium chloride (KCl) to achieve the rate of 240 mg K·dm−3. Disease symptoms were more pronounced in inoculated plants...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Gas exchange; Host defense; Mango wilt; Plant nutrition; Vascular disease.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400521

Photosynthetic response of soybean to twospotted spider mite (Acari: Tetranychydae) injury
Provedor de dados: 52
Autores: Bueno,Adeney de Freitas; Bueno,Regiane Cristina Oliveira de Freitas; Nabity,Paul David; Higley,Leon George; Fernandes,Odair Aparecido.
The twospotted spider mite Tetranychus urticae Koch is a common pest on soybean plants. To clarify plant-arthropod interaction on mite-soybean system, leaf fluorescence, photosynthetic responses to variable carbon dioxide levels, and chlorophyll content were evaluated. Significant photosynthetic rate reduction was observed due to stomatal limitation. Stomatal closure was the major plant physiological response. As a consequence, there was reduction in photosynthetic rates. Surprisingly, plants did not show chlorophyll content reduction associated with photosynthetic impairment. No differences in fluorescence data indicate that T. urticae injury did not impair the function of light harvesting and photoelectron transport. These results showed that T. urticae...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tetranychus urticae; Insect-plant relationship; Fluorescence; Gas exchange; Photosynthesis.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400005

Anatomy of pneumatophore of Mauritia vinifera mart
Provedor de dados: 52
Autores: Pereira,Luiz Alfredo Rodrigues; Calbo,Maria Elisa Ribeiro; Ferreira,Claiton Juvenir.
Pneumatophores of Mauritia vinifera Mart. were collected from six month-old plants maintained submerged in fresh water to induce pneumatophore formation. Twenty day-old pneumatophores had a quite prominent root cap. The epidermis was composed of hexagonal cells, tangentially distributed along the cylindric surface of the organ. In transverse section these pneumatophores had a simple epidermis over several layers of sclerified parenchyma, which covered an aerenchyma with large intercellular spaces. The endodermal cells had Casparian strips. The vascular cylinder was polyarch, with a pith and surrounded by a unisseriate pericycle. Anatomically the 4 month-old pneumatophores were similar to the younger ones, except for the absence of the epidermis. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Buriti; Mauritia vinifera; Pneumatophores; Gas exchange.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300013

Intensity and physiological responses to the 6-minute walk test in middle-aged and older adults: a comparison with cardiopulmonary exercise testing
Provedor de dados: 56
Autores: Sperandio,E.F.; Arantes,R.L.; Matheus,A.C.; Silva,R.P.; Lauria,V.T.; Romiti,M.; Gagliardi,A.R.T.; Dourado,V.Z.
The 6-minute walk test (6MWT) is a simple field test that is widely used in clinical settings to assess functional exercise capacity. However, studies with healthy subjects are scarce. We hypothesized that the 6MWT might be useful to assess exercise capacity in healthy subjects. The purpose of this study was to evaluate 6MWT intensity in middle-aged and older adults, as well as to develop a simple equation to predict oxygen uptake (      V ˙ O 2) from the 6-min walk distance (6MWD). Eighty-six participants, 40 men and 46 women, 40-74 years of age and with a mean body mass index of 28±6 kg/m2, performed the 6MWT according to American Thoracic Society guidelines. Physiological responses were evaluated during the 6MWT using a K4b2 Cosmed telemetry gas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise; Walking; Gas exchange.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000400349

Water deficit affects photosynthetic induction in Bauhinia forficata Link (Fabaceae) and Esenbeckia leiocarpa Engl. (Rutaceae) growing in understorey and gap conditions
Provedor de dados: 61
Autores: Portes,Maria T.; Alves,Thiago H.; Souza,Gustavo M.
In tropical forests, light is considered the most limiting resource for plant growth and reproduction. Besides light, water deficit leads invariably to a decrease in photosynthesis. Thus, despite of the unquestionable role of light in CO2 assimilation (A), it is expected that water deficit affects and limits the light utilization by plants. In this study, we investigated how water deficit influenced the photosynthetic induction of the early successional tree Bauhinia forficata (Fabaceae) and the late successional Esenbeckia leiocarpa (Rutaceae) in the understorey and in the forest gap. Field measurements were carried out in June and August 2006 in plants of approximately two-years-old. In August, the plants were subjected to a period of 45 d without rain...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drought; Ecophysiology; Gas exchange; Light utilization; Sunflecks; Tropical forest succession.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000400007

Influence of chromium in Laguncularia racemosa (L). Gaertn f. physiology
Provedor de dados: 61
Autores: Rocha,Andréa C.; Canal,Emerson C.; Campostrini,Eliemar; Reis,Fabrício O.; Cuzzuol,Geraldo Rogério F.
Most studies of chromium have been realized in the sediments and in mangrove trees. However, little is known about its effect on growth and metabolism in this vegetation. L. racemosa plants were grown in solution with 20% of ionic strength of Hoagland and Arnon containing 100 mM NaCl and supplemented with 0.00, 0.05 and 0.50 mg L-1 of Cr+3. The growth, the pigments and gas exchange measurements showed no changes in response to doses of chromium. After 30 days the initiation of treatments, plants of L. racemosa had average 0.559 g of total dry weight, 1.34 mg L-1 of total chlorophyll and 7.9 µmol m-2 s-1 of A (CO2 photosynthetic assimilation). The photochemical potential efficiency was affected by the intermediate dose of 0.05 mg L-1 of Cr+3 (Fv/Fm=0.73)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrates; Fluorescence; Gas exchange; Growth; Heavy metal; Mangrove.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000200001

Limitations to photosynthesis at different temperatures in the leaves of Citrus limon
Provedor de dados: 61
Autores: Pimentel,Carlos; Bernacchi,Carl; Long,Steve.
The response of CO2 assimilation rate (A) to the intercellular partial pressure of CO2 (Ci) was measured on intact lemon leaves over a range of temperatures (10 to 40ºC). The A/Ci response shows how change in the leaf temperature alters the activity of ribulose-1,5-bisphosphate (RuBP) carboxylase-oxygenase (Rubisco) and RuBP regeneration via electron transport. The rate of A reached a maximum of 7.9 to 8.9 µmol m-2 s-1 between 25 and 30ºC, while dark respiration (Rd) increased with temperature from 0.4 µmol m-2 s-1 at 10ºC to 1.4 µmol m-2 s-1 at 40ºC. The maximum rates of carboxylation (Vc,max) and the maximum rates of electron transport (Jmax) both increased over this temperature range from 7.5 to 142 µmol m-2 s-1 and from 23.5 to 152 µmol m-2 s-1,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: A/Ci curves; Gas exchange; Lemon.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200006

Photosynthetic activity in the rootstock of hybrid peach trees submitted to water restriction and flooding
Provedor de dados: 61
Autores: Martinazzo,Emanuela G.; Perboni,Anelise T.; Farias,Márcio E.; Bianchi,Valmor J.; Bacarin,Marcos A.
This study aimed to evaluate the effect of flooding and water restriction (drought) on the photosynthetic activity in plants of the hybrid rootstock 'GxN-9' (Prunus dulcis Mill. × Prunus persica L. Bastsch), grown in a greenhouse. Chlorophyll fluorescence and gas exchange were analyzed in plants of approximately 12 months. The reduction of photosynthetic activity in both the stresses were associated with decreased carboxylation efficiency, but without affecting the internal concentration of carbon dioxide. The JIP-test parameters revealed changes in the energy flux processes demonstrating that in terms of flooding the rootstock GxN-9 the rate of photosynthetic performance significantly decreases, resulting in a considerable decrease in net assimilation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stress; Chlorophyll a fluorescence; Gas exchange; JIP-test; Prunus dulcis Mill. × Prunus persica L. Bastsch.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300007

Leaf heliotropism in Styrax camporum Pohl from the Brazilian cerrado: distinct gas exchange and leaf structure, but similar leaf temperature and water relations
Provedor de dados: 61
Autores: Habermann,Gustavo; Machado,Silvia R.; Guimarães,Vandeir F.; Rodrigues,João D.
Styrax camporum is a common shrub species from the cerrado regions of São Paulo State, Brazil. Although its leaves do not have a morphologically delimited pulvinus, the apical leaves are oriented parallel to the sun (paraheliotropic leaves), most notably around noon. Horizontal leaves at the base of shoots are oriented perpendicular to the sun's rays (diaheliotropic leaves). The ecophysiological significance of this is not fully understood. We investigated how paraheliotropism influences daily CO2 assimilation (A) and other gas exchange rates, water relations, leaf temperature (Tl), and how these relate to leaf structure as assessed by anatomical leaf descriptions. Paraheliotropic leaves had greater A and stomatal conductance (g s), which led to greater...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian savanna; Ecophysiology; Gas exchange; Leaf movements; Leaf temperature; Photosynthesis; Styracaceae.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100008

Light as an indicator of ecological succession in brazilwood (Caesalpinia echinata Lam.)
Provedor de dados: 61
Autores: Mengarda,Liana H. G.; Souza,Rogério L. F. de; Campostrini,Eliemar; Reis,Fabrício O.; Vendrame,Wagner A.; Cuzzuol,Geraldo R. F.
The ecophysiological behavior of brazilwood (Caesalpinia echinata Lam.) plants was evaluated as affected by light quantity and quality. Nine-month-old plants were cultivated under 0%, 50%, and 80% artificial shading, and natural shading imposed by a closed canopy for a period of 392 days. At the end of that period growth parameters were measured, including relative growth rate (RGR), net assimilation rate (NAR), leaf area ratio (LAR), specific leaf mass (SLM) and root:shoot ratio (R:S). Higher leaf area, dry mass and RGR were obtained under 50% artificial shade. Under full sunlight (0% shade), growth was satisfactory showing higher R:S and SLM. Growth was inhibited under 80% artificial and natural shading indicating that C. echinata is not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Gas exchange; Growth; Light stress; Shade; Tropical tree.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100007

Growth and photosynthetic responses of Picea asperata seedlings to enhanced ultraviolet-B and to nitrogen supply
Provedor de dados: 61
Autores: Yao,Xiaoqin; Liu,Qing; Han,Chao.
Ultraviolet-B (UV-B) radiation and nitrogen are expected to increase simultaneously with future changes in global climate. In this study, growth and photosynthetic responses of Picea asperata seedlings to enhanced UV-B and to nitrogen supply were studied. The experimental design included two levels of UV-B treatments (ambient UV-B, 11.02 kJ m-2 d-1; enhanced UV-B, 14.33 kJ m-2 d-1) and two nitrogen levels (0; 20 g N m-2) to determine whether nitrogen can alleviate the negative impacts of enhanced UV-B on seedling growth and photosynthesis. Enhanced UV-B significantly inhibited plant growth and impaired net photosynthetic rate, stomatal conductance, transpiration rate, the light-saturated assimilation rate, assimilation capacity, light compensation point,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Growth; Gas exchange; Nitrogen; Picea asperata; Photosynthesis; UV-B.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100002

Ecophysiology of tropical tree crops: an introduction
Provedor de dados: 61
Autores: DaMatta,Fábio M.
In this special issue, ecophysiology of major tropical tree crops, considered here on a broader sense and including species such as banana, cashew, cassava, citrus, cocoa, coconut, coffee, mango, papaya, rubber, and tea, are examined. For most of these crops, photosynthesis is treated as a central process affecting growth and crop performance. The crop physiological responses to environmental factors such as water availability and temperature are highlighted. Several gaps in our database concerning ecophysiology of tropical tree crops are indicated, major advances are examined, and needs of further researches are delineated.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crop growth and production; Environmental stresses and physiology; Photosynthesis; Gas exchange; Tropical tree crops.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400001

Some aspects of citrus ecophysiology in subtropical climates: re-visiting photosynthesis under natural conditions
Provedor de dados: 61
Autores: Ribeiro,Rafael V.; Machado,Eduardo C.
In this review we re-visit and discuss the current knowledge on ecophysiology of citrus trees, addressing the influence of environmental conditions on citrus photosynthesis. Knowledge of physiological responses of citrus trees to their surrounding environment is essential in order to improve crop production and plant development, both being consequences of appropriate horticultural management in citrus orchards. In this context, citrus photosynthesis is addressed as the primary source of carbon and energy for plant growth and development. The photosynthetic activity on both a daily and a seasonal scale is reviewed, taking into consideration the physiological aspects related to seasonal variation of photochemical and biochemical activities, stomatal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrate; Citrus; Chlorophyll fluorescence; Gas exchange; Seasonality.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400009

Ecophysiological studies of two andean forest contrasting species Abatia parviflora and Myrcianthes leucoxyla under Bogotá conditions, Colombia
Provedor de dados: 61
Autores: Colmenares-Trejos,Sara L.; Melgarejo,Luz Marina; Romero A.,Hernán Mauricio.
The physiological response of high Andean forest contrasting plants, Myrcianthes leucoxyla, a shadow-facultative heliophyte, and Abatia parviflora, a heliophyte, was studied during the transition from dry season to wet season in Bogotá. Light response curves (A-PAR), water potential (Ψw), transpiration rate (E), stomatal conductance (gs), leaf soluble protein content and peroxidase activity were measured in this study in a 48h cycle. The values for E, gs, Ψw and Ψw predawn for M. leucoxyla were 0.07 to 4.89 µg/cm s, 0.02 to 0.5 cm s-1, -0.025 to -1.05 MPa, and-0.1 MPa, respectively. For A. parviflora E, gs, Ψw and Ψw predawn were 0.47 to 12.27 µg/cm s, 0.17 to 1.42 cm s-1, -0.05 to -0.3 MPa and -0.075 MPa, respectively. A. parviflora presented a tendency...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: A-PAR curves; Gas exchange; Heliophyte; Shadow plant; Water potential.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400008

Effects of changes in the photosynthetic photon flux density on net gas exchange of Citrus limon and Nicotiana tabacum
Provedor de dados: 61
Autores: Pimentel,Carlos; Ribeiro,Rafael Vasconcelos; Santos,Mauro Guida dos; Oliveira,Ricardo Ferraz de; Machado,Eduardo Caruso.
The objective of this study was to evaluate the effects of changes in the photosynthetic photon flux density (PPFD) on net gas exchange of Citrus limon, a woody species, and Nicotiana tabacum, an herbaceous species. When PPFD was increased from 50 to 350 mumol.m-2.s-1 and returned to 50 mumol.m-2.s-1 after 60 min, the CO2 assimilation rate (A) increased and stabilized after 15 min in both species. Stomatal conductance (g s), however, continued to increase. After returning to low PPFD, A immediately diminished to a low value for both lemon and tobacco. Stomatal conductance of lemon diminished slowly over 60 min, whereas g s for tobacco took only 15 min to decrease. This difference in behavior is probably due to over-sensitivity of stomata of woody species,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CO2 assimilation rate; Gas exchange; Stomata; Intrinsic water use efficiency.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200002

Morphological analysis and photosynthetic performance of improved papaya genotypes
Provedor de dados: 61
Autores: Torres Netto,Alena; Campostrini,Eliemar; Azevedo,Letícia C.; Souza,Marcelo A.; Ramalho,José C.; Chaves,Manuela M.
Brazil is the largest world producer of papaya and the third largest exporter despite of only 1.5 to 2.0% of its production is exported. Such an underexplored exportation potential highlight the necessity for physiological studies on new cultivars and hybrids to verify their agronomic and commercial viability. Two Brazilian states, Bahia and Espirito Santo, are responsible for 80% of national production. Papaya can also be an agricultural alternative to north / northeast of Rio de Janeiro, because the region is close to consumer centers and have similar environmental conditions of the most productive regions. Nevertheless, it is worth to develop cultivars that can express the highest yield potential in this region. The aim of this work was to characterize...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya L.; Fluorescence; Gas exchange; Genotypes; Growth analyses.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300005

Photo-oxidative stress in coconut seedlings: early events to leaf scorching and seedling death
Provedor de dados: 61
Autores: Naresh,Kumar S.; Kasturi Bai,K.V.
Experiments were conducted on coconut seedlings to delineate events of photo-oxidative stress damage. Studies on chlorophyll fluorescence indicated a clear case of excess light energy under high light conditions causing stress to coconut seedlings raised under coconut palms. Quantum yield of photo-chemistry of leaflets exposed to high light was significantly less than those under shade. Seedlings exposed to high light and then shifted to shade have shown significant improvement in quantum yield. Excess light energy harvested by chlorophyll antenna caused high non-photochemical quenching resulting in production of biologically toxic super oxide, hydrogen peroxide and hydroxyl radicals. It is apparent that photoinhibition of photosynthesis takes place due to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cocos nucifera; Chlorophyll fluorescence; Oxidative stress; Photosynthesis; Lipid peroxidation; Gas exchange; Proteins.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300006

Flask sealing on in vitro seed germination and morphogenesis of two types of ornamental pepper explants
Provedor de dados: 65
Autores: Batista,Diego Silva; Dias,Leonardo Lucas Carnevalli; Rêgo,Mailson Monteiro do; Saldanha,Cleber Witt; Otoni,Wagner Campos.
ABSTRACT: The influence of flask sealing and explant source on the in vitro morphogenesis of pepper, were evaluated in Capsicum annuum. Seeds were sterilized and inoculated in Murashige and Skoog media supplemented with vitamins, myo-inositol, sucrose, and agar. Gas exchange was evaluated in the germination stage by comparing 3 flask-sealing systems: rigid polypropylene lids (PLs) without vents, PLs with 1 vent, and PLs with 2 vents covered with membranes. In the regeneration stage, cotyledon and hypocotyl segments were transferred to the organogenesis-inducing media, being the different sealing types also tested in a factorial scheme. Photosynthetic pigments, morphological and hystological analyses were conducted for each treatment. Plants maintained in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micropropagation; Gas exchange; Ornamental plant; Capsicum annuum.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300402

Physiological and biochemical responses of apple trees to irrigation water depth in a semiarid region of Brazil
Provedor de dados: 64
Autores: Oliveira,Cíntia Patrícia Martins de; Simões,Welson Lima; Silva,José Aliçandro Bezerra da; Faria,Glaucia Amorim; Lopes,Paulo Roberto Coelho; Amorim,Magno do Nascimento.
ABSTRACT The present study evaluated the physiological and biochemical parameters of apple trees under different irrigation water depths in a semiarid region of Brazil. The experiment had a split-plot randomized block design. Irrigation levels (60, 80, 100, and 120% of the reference evapotranspiration - ET0) and two apple cultivars (Julieta and Princesa) were analysed in the experimental plots and the phenological stages (vegetative, flowering and fruiting) were analysed in the experimental subplots. The physiological characteristics evaluated included the chlorophyll index, relative water content, net photosynthesis, stomatal conductance, transpiration, internal CO2 concentration, leaf temperature and instant carboxylation efficiency. The biochemical...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Malus domestica; Gas exchange; Leaf carbohydrates; Physiological stages.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100238