Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/993361
Título: Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
Autoria: AIDAR, S. de T.
MEIRELLES, S. T.
OLIVEIRA, R. F.
CHAVES, A. R. de M.
FERNANDES JUNIOR, P. I.
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.
Ano de publicação: 2014
Referência: Photosynthetica, v. 52, n. 1, p. 124-133, 2014.
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
Thesagro: Planta
Caatinga
NAL Thesaurus: Gas exchange
Velloziaceae
Palavras-chave: Poikilochorophyllous
Fluorescência da clorofila
Troca de gás
Planta nativa
Planta tolerante a seca
Pleurostima purpurea
Chlorophyll fluorescence
Photoprotective mechanisms
Digital Object Identifier: 10.1007/s11099-014-0014-0
Tipo do material: Artigo de periódico
Acesso: openAccess
Aparece nas coleções:Artigo em periódico indexado (CPATSA)

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
Agnaldo1.pdf378,37 kBAdobe PDFThumbnail
Visualizar/Abrir

FacebookTwitterDeliciousLinkedInGoogle BookmarksMySpace