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| Registros recuperados : 2.276 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
26/08/2014 |
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Data da última atualização: |
26/08/2014 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
AIDAR, S. de T.; MEIRELLES, S. T.; OLIVEIRA, R. F.; CHAVES, A. R. de M.; FERNANDES JUNIOR, P. I. |
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Afiliação: |
SAULO DE TARSO AIDAR, CPATSA; S. T. MEIRELLES, Instituto de Biociências, Universidade de São Paulo; R. F. OLIVEIRA, Escola Superior de Agricultura Luiz de Queiroz; AGNALDO RODRIGUES DE MELO CHAVES, CPATSA; PAULO IVAN FERNANDES JUNIOR, CPATSA. |
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Título: |
Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Photosynthetica, v. 52, n. 1, p. 124-133, 2014. |
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DOI: |
10.1007/s11099-014-0014-0 |
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Idioma: |
Inglês |
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Conteúdo: |
The poikilochorophyllous, desiccation-tolerant (PDT) angiosperm, Pleurostima purpurea, normally occurs in less exposed rock faces and slightly shady sites. Our aim was to evaluate the light susceptibility of the photosynthetic apparatus during dehydration-rehydration cycle in P. purpurea. In a controlled environment, the potted plants were subjected to water deficit under two different photosynthetic photon flux densities [PPFD, 100 and 400 μmol(photon) m?2 s?1]. In the higher PPFD, net photosynthetic rate (PN) become undetectable after stomata closure but photochemical efficiency of photosystem II, electron transport rate, and photochemical quenching coefficient were maintained relatively high, despite a partial decrease. The photochemical activity was inhibited only after the complete loss of chlorophylls, when leaf relative water content dropped below 72% and total carotenoids reached maximal accumulation. Nonphotochemical energy dissipation increased earlier in response to dehydration under higher PPFD. PN and photochemical activity were fully recovered after rehydration under both light treatments. Our results suggested that the natural occurrence of P. purpurea should not be restricted by the light intensity during the complete desiccation-rehydration cycles. Additional key words: chlorophyll fluorescence; gas exchange; photoprotective mechanisms; vegetative desiccation tolerance |
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Palavras-Chave: |
Chlorophyll fluorescence; Fluorescência da clorofila; Photoprotective mechanisms; Planta nativa; Planta tolerante a seca; Pleurostima purpurea; Poikilochorophyllous; Troca de gás. |
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Thesagro: |
Caatinga; Planta. |
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Thesaurus NAL: |
Gas exchange; Velloziaceae. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/107278/1/Agnaldo-1.pdf
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Marc: |
LEADER 02442naa a2200325 a 4500
001 1993361
005 2014-08-26
008 2014 bl uuuu u00u1 u #d
024 7 $a10.1007/s11099-014-0014-0$2DOI
100 1 $aAIDAR, S. de T.
245 $aPhotosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.$h[electronic resource]
260 $c2014
520 $aThe poikilochorophyllous, desiccation-tolerant (PDT) angiosperm, Pleurostima purpurea, normally occurs in less exposed rock faces and slightly shady sites. Our aim was to evaluate the light susceptibility of the photosynthetic apparatus during dehydration-rehydration cycle in P. purpurea. In a controlled environment, the potted plants were subjected to water deficit under two different photosynthetic photon flux densities [PPFD, 100 and 400 μmol(photon) m?2 s?1]. In the higher PPFD, net photosynthetic rate (PN) become undetectable after stomata closure but photochemical efficiency of photosystem II, electron transport rate, and photochemical quenching coefficient were maintained relatively high, despite a partial decrease. The photochemical activity was inhibited only after the complete loss of chlorophylls, when leaf relative water content dropped below 72% and total carotenoids reached maximal accumulation. Nonphotochemical energy dissipation increased earlier in response to dehydration under higher PPFD. PN and photochemical activity were fully recovered after rehydration under both light treatments. Our results suggested that the natural occurrence of P. purpurea should not be restricted by the light intensity during the complete desiccation-rehydration cycles. Additional key words: chlorophyll fluorescence; gas exchange; photoprotective mechanisms; vegetative desiccation tolerance
650 $aGas exchange
650 $aVelloziaceae
650 $aCaatinga
650 $aPlanta
653 $aChlorophyll fluorescence
653 $aFluorescência da clorofila
653 $aPhotoprotective mechanisms
653 $aPlanta nativa
653 $aPlanta tolerante a seca
653 $aPleurostima purpurea
653 $aPoikilochorophyllous
653 $aTroca de gás
700 1 $aMEIRELLES, S. T.
700 1 $aOLIVEIRA, R. F.
700 1 $aCHAVES, A. R. de M.
700 1 $aFERNANDES JUNIOR, P. I.
773 $tPhotosynthetica$gv. 52, n. 1, p. 124-133, 2014.
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Embrapa Semiárido (CPATSA) |
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