Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/993361
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dc.contributor.authorAIDAR, S. de T.pt_BR
dc.contributor.authorMEIRELLES, S. T.pt_BR
dc.contributor.authorOLIVEIRA, R. F.pt_BR
dc.contributor.authorCHAVES, A. R. de M.pt_BR
dc.contributor.authorFERNANDES JUNIOR, P. I.pt_BR
dc.date.accessioned2014-08-26T11:11:11Zpt_BR
dc.date.available2014-08-26T11:11:11Zpt_BR
dc.date.created2014-08-26pt_BR
dc.date.issued2014pt_BR
dc.identifier.citationPhotosynthetica, v. 52, n. 1, p. 124-133, 2014.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/993361pt_BR
dc.descriptionThe 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 tolerancept_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.subjectPoikilochorophyllouspt_BR
dc.subjectFluorescência da clorofilapt_BR
dc.subjectTroca de gáspt_BR
dc.subjectPlanta nativapt_BR
dc.subjectPlanta tolerante a secapt_BR
dc.subjectPleurostima purpureapt_BR
dc.subjectChlorophyll fluorescencept_BR
dc.subjectPhotoprotective mechanismspt_BR
dc.titlePhotosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2014-08-26T11:11:11Zpt_BR
dc.subject.thesagroPlantapt_BR
dc.subject.thesagroCaatingapt_BR
dc.subject.nalthesaurusGas exchangept_BR
dc.subject.nalthesaurusVelloziaceaept_BR
riaa.ainfo.id993361pt_BR
riaa.ainfo.lastupdate2014-08-26pt_BR
dc.identifier.doi10.1007/s11099-014-0014-0pt_BR
dc.contributor.institutionSAULO 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.pt_BR
Aparece nas coleções:Artigo em periódico indexado (CPATSA)

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