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Registro Completo |
Biblioteca(s): |
Embrapa Unidades Centrais. |
Data corrente: |
25/11/2005 |
Data da última atualização: |
20/08/2018 |
Autoria: |
SOUZA, R. P. de; RIBEIRO, R. V.; MACHADO, E. C.; OLIVEIRA, R. F. de; SILVEIRA, J. A. G. da. |
Afiliação: |
Rogéria Pereira de Souza, Instituto Agronômico - IAC/Centro de Pesquisa e Desenvolvimento em Ecofisiologia e Biofísica; Rafael Vasconcelos Ribeiro, Instituto Agronômico - IAC/Centro de Pesquisa e Desenvolvimento em Ecofisiologia e Biofísica; Eduardo Caruso Machado, Instituto Agronômico - IAC/Centro de Pesquisa e Desenvolvimento em Ecofisiologia e Biofísica; Ricardo Ferraz de Oliveira, Universidade de São Paulo - Usp/Escola Superior de Agricultura Luiz de Queiroz - Esalq/Departamento de Ciências Biológicas; Joaquim Albenísio Gomes da Silveira, Universidade Federal do Ceará - UFC/Departamento de Bioquímica e Biologia Molecular. |
Título: |
Photosynthetic responses of young cashew plants to varying environmental conditions. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 8, p. 735-744, ago. 2005 |
Idioma: |
Inglês |
Notas: |
Título em português: Respostas da fotossíntese à variação das condições ambientais em plantas jovens de cajueiro. |
Conteúdo: |
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. Stomata, however, were strongly affected by VPD, exhibiting gradual closure above 1.5 kPa. The reduced stomatal conductances at high VPD were efficient in restricting water losses by transpiration, demonstrating the species adaptability to dry environments. Under natural irradiance, CO2 assimilation rates were saturated in early morning, following thereafter the PPFD changes. Transient Fv/Fm decreases were registered around 11h, indicating the occurrence of photoinhibition. Decreases of excitation capture efficiency, decreases of effective quantum yield of photosystem II, and increases in non-photochemical quenching were consistent with the occurrence of photoprotection under excessive irradiance levels. |
Palavras-Chave: |
chlorophyll fluorescence; déficit da pressão de vapor; fluorescência da clorofila; trocas gasosas; vapor-pressure deficit. |
Thesagro: |
Anacardium Occidentale; Temperatura. |
Thesaurus Nal: |
gas exchange; temperature. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/107668/1/Photosynthetic.pdf
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Marc: |
LEADER 02468naa a2200289 a 4500 001 1116452 005 2018-08-20 008 2005 bl uuuu u00u1 u #d 100 1 $aSOUZA, R. P. de 245 $aPhotosynthetic responses of young cashew plants to varying environmental conditions. 260 $c2005 500 $aTítulo em português: Respostas da fotossíntese à variação das condições ambientais em plantas jovens de cajueiro. 520 $aThe 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. Stomata, however, were strongly affected by VPD, exhibiting gradual closure above 1.5 kPa. The reduced stomatal conductances at high VPD were efficient in restricting water losses by transpiration, demonstrating the species adaptability to dry environments. Under natural irradiance, CO2 assimilation rates were saturated in early morning, following thereafter the PPFD changes. Transient Fv/Fm decreases were registered around 11h, indicating the occurrence of photoinhibition. Decreases of excitation capture efficiency, decreases of effective quantum yield of photosystem II, and increases in non-photochemical quenching were consistent with the occurrence of photoprotection under excessive irradiance levels. 650 $agas exchange 650 $atemperature 650 $aAnacardium Occidentale 650 $aTemperatura 653 $achlorophyll fluorescence 653 $adéficit da pressão de vapor 653 $afluorescência da clorofila 653 $atrocas gasosas 653 $avapor-pressure deficit 700 1 $aRIBEIRO, R. V. 700 1 $aMACHADO, E. C. 700 1 $aOLIVEIRA, R. F. de 700 1 $aSILVEIRA, J. A. G. da 773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 40, n. 8, p. 735-744, ago. 2005
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Embrapa Unidades Centrais (AI-SEDE) |
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Registros recuperados : 7 | |
5. | | SOUZA, R. P. de; RIBEIRO, R. V.; MACHADO, E. C.; OLIVEIRA, R. F. de; SILVEIRA, J. A. G. da. Photosynthetic responses of young cashew plants to varying environmental conditions. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 8, p. 735-744, ago. 2005 Título em português: Respostas da fotossíntese à variação das condições ambientais em plantas jovens de cajueiro.Biblioteca(s): Embrapa Unidades Centrais. |
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6. | | ASADA, M.; TAKEDA, M.; TOMAS, W. M.; PELLEGRIN, A. O.; OLIVEIRA, C. H. S. de; BARBOSA, J. D.; SILVEIRA, J. A. G. da; BRAGA, E. M.; KANEKO, O. Close relationship of Plasmodium sequences detected from South American pampas deer (Ozotoceros bezoarticus) to Plasmodium spp. in North American white-tailed deer. International Journal For Parasitology: parasites and wildlife, v. 7, p. 44-47, 2018.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
Biblioteca(s): Embrapa Pantanal. |
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7. | | PONTE, L. F. A.; FERREIRA, O. S.; ALVES, F. A. L.; FERREIRA-SILVA, S. L.; PEREIRA, V. L. A.; SILVEIRA, J. A. G. da. Variabilidade de indicadores fisiológicos de resistência à salinidade entre genótipos de cajueiro-anão e gigante. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 46, n. 1, p. 1-8, jan. 2011. Título em inglês: Variability of physiological indicators of resistance to salinity between genotypes of dwarf and giant cashew.Biblioteca(s): Embrapa Unidades Centrais. |
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Registros recuperados : 7 | |
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