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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
Autores:  AIDAR, S. de T.
MEIRELLES, S.T.
OLIVEIRA, R. F.
CHAVES, A. R. de M.
FERNANDES JUNIOR, P. I.
Data:  2014-08-26
Ano:  2014
Palavras-chave:  Poikilochorophyllous
Fluorescência da clorofila
Troca de gás
Planta nativa
Planta tolerante a seca
Pleurostima purpurea
Velloziaceae
Planta
Caatinga
Chlorophyll fluorescence
Gas exchange
Photoprotective mechanisms
Resumo:  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

2014
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Inglês
Identificador:  53277

http://www.alice.cnptia.embrapa.br/handle/doc/993361

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/107278/1/Agnaldo-1.pdf

10.1007/s11099-014-0014-0
Editor:  Photosynthetica, v. 52, n. 1, p. 124-133, 2014.
Relação:  Embrapa Semiárido - Artigo em periódico indexado (ALICE)
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