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Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
25/11/2005 |
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Data da última atualização: |
20/08/2018 |
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Autoria: |
SOUZA, R. P. de; RIBEIRO, R. V.; MACHADO, E. C.; OLIVEIRA, R. F. de; SILVEIRA, J. A. G. da. |
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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. |
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Título: |
Photosynthetic responses of young cashew plants to varying environmental conditions. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 8, p. 735-744, ago. 2005 |
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Idioma: |
Inglês |
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Notas: |
Título em português: Respostas da fotossíntese à variação das condições ambientais em plantas jovens de cajueiro. |
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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. |
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Palavras-Chave: |
chlorophyll fluorescence; déficit da pressão de vapor; fluorescência da clorofila; trocas gasosas; vapor-pressure deficit. |
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Thesagro: |
Anacardium Occidentale; Temperatura. |
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Thesaurus NAL: |
gas exchange; temperature. |
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Categoria do assunto: |
-- |
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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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