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A new concept for insect damage evaluation based on plant physiological variables Anais da ABC (AABC)
Neves,Ademir D.; Oliveira,Ricardo F.; Parra,José R.P..
The objective of this study was to determine the damage levels caused by Orthezia praelonga Douglas, 1891 and Leucoptera coffeella (Guérin-Mèneville 1842), on rangpur lime and Obatã coffee leaves, respectively. Measurements were based on a new concept for the evaluation of the following plant physiological parameters: photosynthesis, stomatal conductance, leaf temperature and transpiration, and internal concentration of CO2 (by infrared analyzer). A negative correlation between infestation level and photosynthesis was found, where the negative inflexion point of the curve was considered as a reference for damage levels. The control level for O. praelonga is below the 7-13% limit for damaged leaf area (40 to 70 scales per leaf), while for L. coffeella it is...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosynthesis; Economic level injury; Citrus; Coffee; Plant-insect interactions.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000400015
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Allelochemicals of Alexandrium minutum: Kinetics of membrane disruption and photosynthesis inhibition in a co-occurring diatom ArchiMer
Long, Marc; Peltekis, Alexandra; González-fernández, Carmen; Hégaret, Helene; Bailleul, Benjamin.
Allelopathy is an efficient strategy by which some microalgae can outcompete other species. Allelochemicals from the toxic dinoflagellate Alexandrium minutum have deleterious effects on diatoms, inhibiting metabolism and photosynthesis and therefore give a competitive advantage to the dinoflagellate. The precise mechanisms of allelochemical interactions and the molecular target of allelochemicals remain however unknown. To understand the mechanisms, the short-term effects of A. minutum allelochemicals on the physiology of the diatom Chaetoceros muelleri were investigated. The effects of a culture filtrate were measured on the diatom cytoplasmic membrane integrity (polarity and permeability) using flow-cytometry and on the photosynthetic performance using...
Tipo: Text Palavras-chave: Allelochemicals; Allelopathy; Alexandrium minutum; Chaetoceros muelleri; Photosynthesis; Membrane.
Ano: 2021 URL: https://archimer.ifremer.fr/doc/00680/79191/81688.pdf
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Análisis bioquímicos y moleculares de la biosíntesis de carotenos en diferentes tejidos de maíz. Colegio de Postgraduados
Silva Pérez, Viridiana.
El maíz (Zea mays L.) es el cultivo básico más importante en México, y en los últimos años se ha secuenciado su genoma. En este trabajo se utiliza parte de la información genómica, 2,039 marcadores moleculares y se relaciona con el contenido de carotenos en líneas endogámicas recombinantes de maíz de la cruza B73 × Mo17 (IBM-RILs) para detectar loci de caracteres cuantitativos (QTLs). En la primera fase, se estudió el contenido de carotenos en las hojas, ya que éstos disipan la energía lumínica utilizada en la fotosíntesis, influyendo así en la tasa fotosintética y en el rendimiento de los cultivos. Se midió el contenido de luteína, β-caroteno, α-caroteno, β-criptoxantina y zeaxantina, y se encontró que β-caroteno representó 80% del total de carotenos. Se...
Palavras-chave: Zea mays; Follaje; Grano; Fotosíntesis; Provitamina A.; Foliage; Kernel; Photosynthesis; Pro-vitamin A; Maestría; Genética.
Ano: 2011 URL: http://hdl.handle.net/10521/450
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Análisis bioquímicos y moleculares de la biosíntesis de carotenos en diferentes tejidos de maíz. Colegio de Postgraduados
Silva Pérez, Viridiana.
El maíz (Zea mays L.) es el cultivo básico más importante en México, y en los últimos años se ha secuenciado su genoma. En este trabajo se utiliza parte de la información genómica, 2,039 marcadores moleculares y se relaciona con el contenido de carotenos en líneas endogámicas recombinantes de maíz de la cruza B73 × Mo17 (IBM-RILs) para detectar loci de caracteres cuantitativos (QTLs). En la primera fase, se estudió el contenido de carotenos en las hojas, ya que éstos disipan la energía lumínica utilizada en la fotosíntesis, influyendo así en la tasa fotosintética y en el rendimiento de los cultivos. Se midió el contenido de luteína, β-caroteno, α-caroteno, β-criptoxantina y zeaxantina, y se encontró que β-caroteno representó 80% del total de carotenos. Se...
Palavras-chave: Zea mays; Follaje; Grano; Fotosíntesis; Provitamina A.; Foliage; Kernel; Photosynthesis; Pro-vitamin A; Maestría; Genética.
Ano: 2011 URL: http://hdl.handle.net/10521/450
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Aspectos biofísicos de cupuaçuzeiro em viveiro. Infoteca-e
FIGUEIRÊDO, F. J. C.; ROCHA NETO, O. G. da; CARVALHO, C. J. R. de.
bitstream/item/34425/1/ORIENTAL-BP9.pdf
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Transpiracao; Condutancia estomatica; Resistencia estomatica; Brasil.; Cupuaçu; Fotossíntese; Fruta; Fisiologia Vegetal; Theobroma Grandiflorum.; Amazonia; Fruits; Photosynthesis; Plant physiology..
Ano: 1999 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/377392
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Aspects of nitrogen metabolism in coffee plants Braz. J. Plant Physiol.
Carelli,Maria Luiza Carvalho; Fahl,Joel Irineu; Ramalho,José D. Cochicho.
Coffee plants are highly N-demanding plants. Despite the importance of N nutrition for the development, acclimation and yield of coffee plants, there are few reports concerning N metabolism in this species. In this review, our intention is to summarize the information available in the literature and to point out the influence of environmental conditions on N assimilation, as well as comment and discuss some apparently contradictory results and raise and enlighten queries about N assimilation in coffee plants.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea; Irradiance level; Nitrate reductase; Nitrogen fertilization; Oxidative stress; Photoinhbition; Photoprotection; Photosynthesis.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000100002
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Calibração do medidor de clorofila Minolta SPAD-502 para uso na cultura do milho. Infoteca-e
ZOTARELLI, L.; CARDOSO, E. G.; PICCININ, J. L.; URQUIAGA, S.; BODDEY, R. M.; TORRES, E.; ALVES, B. J. R..
bitstream/CNPAB-2010/28067/1/cot055.pdf
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Calibração; Maize.; Clorofila; Fotossíntese; Medição; Milho; Pigmento.; Calibration; Pigments.; Photosynthesis.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/624249
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Características fotossintéticas de genótipos de capim-elefante anão (Pennisetum purpureum Schum.), em estresse hídrico - DOI: 10.4025/actascianimsci.v32i1.8961 Animal Sciences
Araújo, Saulo Alberto do Carmo; UFVJM; Vasquez, Hernan Maldonado; UENF; Campostrini, Eliemar; UENF; Netto, Alena Torres; UENF; Deminicis, Bruno Borges; UENF; Lima, Érico da Silva; UENF.
O experimento foi realizado com o objetivo de avaliar as trocas gasosas de genótipos de capim-elefante anão, em diferentes condições hídricas. O delineamento experimental foi inteiramente casualizado com três repetições. Foram avaliados três genótipos de capim-elefante anão (Mott, CNPGL 94-34-3 e CNPGL 92-198-7) em duas condições de umidade do solo: irrigado (I) e não-irrigado (NI). Foi observada diferença entre os tratamentos I e NI para todos os genótipos em relação à taxa fotossintética, condutância estomática, transpiração e déficit de pressão de vapor. O genótipo CNPGL 94-34-3 apresentou maior tolerância ao estresse hídrico, seguido pelos genótipos Mott e CNPGL 92-198-7. Todos os genótipos avaliados apresentaram, em condições ideais de umidade do...
Tipo: Pesquisa de campo Palavras-chave: Ciências Agrárias condutância estomática; Déficit de pressão de vapor; Fotoinibição; Fotossíntese; Transpiração Zootecnia stomatal conductance; Vapor pressure deficit; Photoinhibition; Photosynthesis; Transpiration.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/8961
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Carbohydrate production and transport in cotton cultivars grown under boron deficiency Scientia Agricola
Bogiani,Julio Cesar; Amaro,Amanda Cristina Esteves; Rosolem,Ciro Antonio.
An adequate supply of boron (B) is required for the optimal growth and development of cotton (Gossypium hirsutum L.) plants, but the low phloem mobility of B limits the possibilities of correcting B deficiency. There are indications that different cotton cultivars could have different responses to B deficiency. The differences in responses of cotton cultivars to B regarding photoassimilate production and transport were studied in a greenhouse experiment with nutrient solution. Treatments consisted of three cotton cultivars (FMT 701, DP 604BG and FMX 993) and five concentrations of B (0.0, 2.5, 5.0, 10.0 and 20.0 µmol L−1). Sampling began at the phenological stage B1 (first square) and continued for four weeks. The leaf area and the number of reproductive...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Micronutrient; Nonstructural carbohydrates; Photosynthesis; Transpiration.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600010
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Carbon isotope composition and leaf anatomy as a tool to characterize the photosynthetic mechanism of Artemisia annua L. Braz. J. Plant Physiol.
Marchese,José Abramo; Broetto,Fernando; Ming,Lin Chau; Ducatti,Carlos; Rodella,Roberto Antonio; Ventrella,Marília Contin; Gomes,Greice Daiane Rodrigues; Franceschi,Lúcia de.
Leaves of Artemisia annua L. are a plentiful source of artemisinin, a drug with proven effectiveness against malaria. The aim of this study was to classify the photosynthetic mechanism of A. annua through studies of the carbon isotope composition (delta 13C) and the leaf anatomy. A. annua presented a delta 13C value of - 31.76 ± 0.07, which characterizes the plants as a typical species of the C3 photosynthethic mechanism, considering that the average delta 13C values for C3 and C4 species are -28 and -14, respectively. The leaf anatomy studies were consistent with the delta 13C results, where, in spite of the existence of parenchymatic cells forming a sheath surrounding the vascular tissue, the cells do not contain chloroplasts or starch. This...
Tipo: Info:eu-repo/semantics/article Palavras-chave: C3 and C4 plants; Isotope discrimination; Kranz anatomy; Photosynthesis.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100016
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Carbon sequestration in the rain forest: alternatives using environmentally friendly biotechnology Biota Neotropica
Buckeridge,Marcos S.; Aidar,Marcos P.M..
As carbon dioxide increases on Earth atmosphere, the rise in average temperatures may provoke changes in the environment that could damage civilisation as we know it. As a result, the need to sequester carbon becomes urgent, and one of the options we have is to use the potential of the forests to do it by enhancing assimilation of CO2 through photosynthesis. However, if we consider the use of plants to increase carbon sequestration, a problem that looms is that species often acclimate and actually reduce CO2 assimilation through feedback mechanisms of the sugars that are the product. In the present article, we propose that some biochemical pathways, such as those in control of photosynthesis, carbohydrate metabolism and assimilation, and cellulose and...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Global change; Carbon Sequestration; Photosynthesis; Rain Forest; Sugar Sensing; Cellulose synthesis; Gene therapy.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032002000100002
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Climate change and agroecosystems: the effect of elevated atmospheric CO2 and temperature on crop growth, development, and yield Ciência Rural
Streck,Nereu Augusto.
The amount of carbon dioxide (CO2) of the Earth´s atmosphere is increasing, which has the potential of increasing greenhouse effect and air temperature in the future. Plants respond to environment CO2 and temperature. Therefore, climate change may affect agriculture. The purpose of this paper was to review the literature about the impact of a possible increase in atmospheric CO2 concentration and temperature on crop growth, development, and yield. Increasing CO2 concentration increases crop yield once the substrate for photosynthesis and the gradient of CO2 concentration between atmosphere and leaf increase. C3 plants will benefit more than C4 plants at elevated CO2. However, if global warming will take place, an increase in temperature may offset the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Global warming; Photosynthesis; Agriculture; Food supply.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782005000300041
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Cloroplast pigments as indicators of lead stress REA
Gomes,Silvânia M. de S.; Lima,Vera Lucia A. de; Souza,Adailson P. de; Nascimento,Joab J. V. R. do; Nascimento,Everaldo S. do.
Plants respond to environmental adversities, becoming an indicator for assessing the environment quality. In this aspect, chlorophyll contents as well, carotenoids are used as a reliable indicator to associate environmental quality and pollution, mainly regarding the toxicity of heavy metals in higher plants. So, we aimed to evaluate the content of chlorophyll a, b, and total chlorophylls and carotenoids in plants vetiver [Vetiveria zizanioides (L.) Nash], maize (Zea mays L.) cv. AG 1051, sunflower (Helianthus annuus L.) cv. BRS 122/V-2000, and castor beans (Ricinus communis L. ) cv . Northeastern BRS grown in contaminated soil with lead, with and without correction of soil pH, so they were used as indicators of metal stress by the soil. From the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heavy metal; Pollution; Photosynthesis.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000500007
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CO2-response function of radiation use efficiency in rice for climate change scenarios PAB
Streck,Nereu Augusto; Rosa,Hamilton Telles; Walter,Lidiane Cristine; Silva,Michel Rocha da; Uhlmann,Lilian Osmari.
The objective of this work was to evaluate a generalized response function to the atmospheric CO2 concentration [f(CO2)] by the radiation use efficiency (RUE) in rice. Experimental data on RUE at different CO2 concentrations were collected from rice trials performed in several locations around the world. RUE data were then normalized, so that all RUE at current CO2 concentration were equal to 1. The response function was obtained by fitting normalized RUE versus CO2 concentration to a Morgan-Mercer-Flodin (MMF) function, and by using Marquardt's method to estimate the model coefficients. Goodness of fit was measured by the standard deviation of the estimated coefficients, the coefficient of determination (R²), and the root mean square error (RMSE). The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa; Global warming; Modeling; Photosynthesis.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012000700001
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Combined effects of global climate change and nutrient enrichment on the physiology of three temperate maerl species ArchiMer
Qui-minet, Zujaila Nohemy; Coudret, Jérôme; Davoult, Dominique; Grall, Jacques; Mendez‐sandin, Miguel; Cariou, Thierry; Martin, Sophie.
Made up of calcareous coralline algae, maerl beds play a major role as ecosystem engineers in coastal areas throughout the world. They undergo strong anthropogenic pressures, which may threaten their survival. The aim of this study was to gain insight into the future of maerl beds in the context of global and local changes. We examined the effects of rising temperatures (+3°C) and ocean acidification (−0.3 pH units) according to temperature and pH projections (i.e., the RCP 8.5 scenario), and nutrient (N and P) availability on three temperate maerl species (Lithothamnion corallioides, Phymatolithon calcareum, and Lithophyllum incrustans) in the laboratory in winter and summer conditions. Physiological rates of primary production, respiration, and...
Tipo: Text Palavras-chave: Calcification; Maerl; Nitrate; Ocean acidification; Ocean warming; Phosphate; Photosynthesis; Respiration.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00595/70722/68955.pdf
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Compatibility of tomato cultivar Santa Cruz Kada grafted on different Solanaceae species and control of bacterial wilt Horticultura Brasileira
Zeist,André R; Giacobbo,Clevison L; Silva Neto,Gentil F da; Zeist,Ricardo A; Dorneles,Keilor da R; Resende,Juliano TV de.
ABSTRACT The objective of this work was to evaluate the compatibility, gas exchange and yield of tomato cultivar Santa Cruz Kada, susceptible to bacterial wilt (Ralstonia solanacearum) when grafted on different Solanaceae species. Rootstock sources were the mini-tomato RVTC-66, Cayenne pepper, Jerusalem cherry (Solanum pseudocapsicum), sticky nightshade (Solanum sisymbriifolium), and cultivar Santa Cruz Kada itself (self-grafting). Two materials were tested to promote the union between rootstocks and scions: grafting clips and biodegradable tape (Parafilm). Grafting success index (GSI) was evaluated and, for treatments using biodegradable tape, grafting incompatibility, gas exchange, agronomic characteristics and bacterial wilt epidemiology were assessed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Solanum lycopersicum; Ralstonia solanacearum; Photosynthesis; Grafting; Production.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000300377
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Coping with branch excision when measuring leaf net photosynthetic rates in a lowland tropical forest ArchiMer
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
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Copper Stress on Photosynthesis of Black Mangle (Avicennia germinans) Anais da ABC (AABC)
GONZALEZ-MENDOZA,DANIEL; GIL,FRANCISCO ESPADAS y; ESCOBOZA-GARCIA,FERNANDO; SANTAMARIA,JORGE M.; ZAPATA-PEREZ,OMAR.
The effects of copper toxicity on the photosynthetic activities of Avicennia germinans was investigated using two CuSO4 concentrations (0.062 and 0.33 M) added in Hoagland's solution in an aerated hydroponic system. Photosynthesis and chlorophyll fluorescence were measured after 30 h of copper stress. Results obtained in this study show that increasing levels of Cu+2 of 0.062 and 0.33 M Cu+2 resulted in a general reduction of the stomatal conductance (28 and 18%, respectively) and 100% of inhibition of net photosynthesis. Additionally, at these concentrations of Cu+2, reductions of chlorophyll fluorescence parameters were also observed. These changes suggested that the photosynthetic apparatus of Avicennia germinans was the primary target of the Cu+2...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avicennia germinans; Chlorophyll fluorescence; Copper; Photosystem II; Photosynthesis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200665
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Cotton response to mepiquat chloride and temperature Scientia Agricola
Rosolem,Ciro A.; Oosterhuis,Derrick M.; Souza,Fabio S. de.
Gibberellin inhibitor growth regulators are used for cotton (Gossypium hirsutum L.) canopy manipulation to avoid excess growth and yield losses. However, under temperatures below or over the optimum for cotton production the effect of mepiquat chloride (MC) has not always been significant. In this experiment, cotton plants were grown in growth chambers to study the response to MC as affected by temperature and to determine if an increase in dose could overcome the temperature effects. Mepiquat chloride was applied at rates of 0, 15 and 30 g ai ha-1 at the pinhead square stage. Plants were then grown under three temperature regimes: 25/15 °C, 32/22 °C, and 39/29 °C (day/night temperatures) for 51 days. Higher temperatures increased plant height,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant growth regulator; Cotton growth; Photosynthesis.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000200004
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Decoupling light harvesting, electron transport and carbon fixation during prolonged darkness supports rapid recovery upon re-illumination in the Arctic diatom Chaetoceros neogracilis ArchiMer
Lacour, Thomas; Morin, Philippe-israël; Sciandra, Théo; Donaher, Natalie; Campbell, Douglas A.; Ferland, Joannie; Babin, Marcel.
During winter in the Arctic marine ecosystem, diatoms have to survive long periods of darkness caused by low sun elevations and the presence of sea ice covered by snow. To better understand how diatoms survive in the dark, we subjected cultures of the Arctic diatom Chaetoceros neogracilis to a prolonged period of darkness (1 month) and to light resupply. Chaetoceros neogracilis was not able to grow in the dark but cell biovolume remained constant after 1 month in darkness. Rapid resumption of photosynthesis and growth recovery was also found when the cells were transferred back to light at four different light levels ranging from 5 to 154 µmol photon m−2 s−1. This demonstrates the remarkable ability of this species to re-initiate growth over a wide range...
Tipo: Text Palavras-chave: Arctic microalgae; Polar night; Diatom; Darkness; Photosynthesis; Growth rate; Temperature.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00499/61066/64597.pdf
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