Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.

Detalhes bibliográficos
Autor(a) principal: AIDAR, S. de T.
Data de Publicação: 2014
Outros Autores: MEIRELLES, S. T., OLIVEIRA, R. F., CHAVES, A. R. de M., FERNANDES JUNIOR, P. I.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/993361
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
id EMBR_d953480a246e82149a28e5ac9517b064
oai_identifier_str oai:www.alice.cnptia.embrapa.br:doc/993361
network_acronym_str EMBR
network_name_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository_id_str 2154
spelling Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.PoikilochorophyllousFluorescência da clorofilaTroca de gásPlanta nativaPlanta tolerante a secaPleurostima purpureaChlorophyll fluorescencePhotoprotective mechanismsPlantaCaatingaGas exchangeVelloziaceaeThe 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 toleranceSAULO 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.AIDAR, S. de T.MEIRELLES, S. T.OLIVEIRA, R. F.CHAVES, A. R. de M.FERNANDES JUNIOR, P. I.2014-08-26T11:11:11Z2014-08-26T11:11:11Z2014-08-2620142014-08-26T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlePhotosynthetica, v. 52, n. 1, p. 124-133, 2014.http://www.alice.cnptia.embrapa.br/alice/handle/doc/99336110.1007/s11099-014-0014-0enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T00:37:00Zoai:www.alice.cnptia.embrapa.br:doc/993361Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T00:37Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
title Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
spellingShingle Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
AIDAR, S. de T.
Poikilochorophyllous
Fluorescência da clorofila
Troca de gás
Planta nativa
Planta tolerante a seca
Pleurostima purpurea
Chlorophyll fluorescence
Photoprotective mechanisms
Planta
Caatinga
Gas exchange
Velloziaceae
title_short Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
title_full Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
title_fullStr Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
title_full_unstemmed Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
title_sort Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration.
author AIDAR, S. de T.
author_facet AIDAR, S. de T.
MEIRELLES, S. T.
OLIVEIRA, R. F.
CHAVES, A. R. de M.
FERNANDES JUNIOR, P. I.
author_role author
author2 MEIRELLES, S. T.
OLIVEIRA, R. F.
CHAVES, A. R. de M.
FERNANDES JUNIOR, P. I.
author2_role author
author
author
author
dc.contributor.none.fl_str_mv 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.
dc.contributor.author.fl_str_mv AIDAR, S. de T.
MEIRELLES, S. T.
OLIVEIRA, R. F.
CHAVES, A. R. de M.
FERNANDES JUNIOR, P. I.
dc.subject.por.fl_str_mv Poikilochorophyllous
Fluorescência da clorofila
Troca de gás
Planta nativa
Planta tolerante a seca
Pleurostima purpurea
Chlorophyll fluorescence
Photoprotective mechanisms
Planta
Caatinga
Gas exchange
Velloziaceae
topic Poikilochorophyllous
Fluorescência da clorofila
Troca de gás
Planta nativa
Planta tolerante a seca
Pleurostima purpurea
Chlorophyll fluorescence
Photoprotective mechanisms
Planta
Caatinga
Gas exchange
Velloziaceae
description 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
publishDate 2014
dc.date.none.fl_str_mv 2014-08-26T11:11:11Z
2014-08-26T11:11:11Z
2014-08-26
2014
2014-08-26T11:11:11Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Photosynthetica, v. 52, n. 1, p. 124-133, 2014.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/993361
10.1007/s11099-014-0014-0
identifier_str_mv Photosynthetica, v. 52, n. 1, p. 124-133, 2014.
10.1007/s11099-014-0014-0
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/993361
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
_version_ 1822721051027570688

Registros relacionados