Physiological responses of macaúba young plants to cyclical drought conditions

Detalhes bibliográficos
Autor(a) principal: Mota, Clenilso Sehnen
Data de Publicação: 2016
Outros Autores: Oliva Cano, Marco Antonio
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Florestal Brasileira (Online)
Texto Completo: https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1061
Resumo: The objective of this study was to evaluate the impact of three cycles of drought/irrigation on the quantum yields of chlorophyll a fluorescence, proline accumulation and osmotic adjustment. Ten plants were submitted to three consecutive cycles of drought/irrigation (D/I) and the other ten were maintained at field capacity.Cycles D/I did not promote osmotic adjustment in plants with suspension of irrigation (WSI), despite the proline accumulation. The minimum fluorescence adapted to dark increased and the maximum quantum efficiency of PSII was reduced in WSI plants. Quantum yield of photochemical energy conversion of photosystem II (PSII) and the apparent rate of electron transport decreased, while quantum yield dissipation regulated non-photochemical energy in PSII showed an increase in WSI plants over those without suspension of irrigation (WOSI). Quantum yield of no regulated dissipation of PSII non-photochemical energy and chlorophyll and carotenoid content showed no change between WSI and WOSI plants over D/I cycles. Thus it was observed that macaubeira presents an efficient mechanism of non-photochemical energy dissipation.
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spelling Physiological responses of macaúba young plants to cyclical drought conditionsRespostas fisiológicas de plantas jovens de macaúba a condições de seca cíclicaAcrocomia aculeataEnergy balanceOsmolytesAcrocomia aculeataBalanço energéticoOsmólitosThe objective of this study was to evaluate the impact of three cycles of drought/irrigation on the quantum yields of chlorophyll a fluorescence, proline accumulation and osmotic adjustment. Ten plants were submitted to three consecutive cycles of drought/irrigation (D/I) and the other ten were maintained at field capacity.Cycles D/I did not promote osmotic adjustment in plants with suspension of irrigation (WSI), despite the proline accumulation. The minimum fluorescence adapted to dark increased and the maximum quantum efficiency of PSII was reduced in WSI plants. Quantum yield of photochemical energy conversion of photosystem II (PSII) and the apparent rate of electron transport decreased, while quantum yield dissipation regulated non-photochemical energy in PSII showed an increase in WSI plants over those without suspension of irrigation (WOSI). Quantum yield of no regulated dissipation of PSII non-photochemical energy and chlorophyll and carotenoid content showed no change between WSI and WOSI plants over D/I cycles. Thus it was observed that macaubeira presents an efficient mechanism of non-photochemical energy dissipation.O objetivo do presente estudo foi avaliar os impactos de três ciclos de seca/ reirrigação sobre os rendimentos quânticos da fluorescência da clorofila a, acúmulo de prolina e ajustamento osmótico. Dez plantas cultivadas em vasos com capacidade de 150 L de solo foram submetidas a três ciclos sucessivos de seca/reirrigação (S/R) e outras dez foram mantidas irrigadas em capacidade de campo. Os ciclos S/R não promoveram ajustamento osmótico nas plantas mantidas com suspensão da irrigação (CSI), apesar do acúmulo de prolina. A fluorescência mínima adaptada ao escuro aumentou e a eficiência quântica máxima do PSII teve redução nas plantas CSI. O rendimento quântico de conversão de energia fotoquímica do fotossistema II (PSII) e a taxa aparente de transporte de elétrons apresentaram redução, enquanto o rendimento quântico de dissipação regulada de energia não fotoquímica no PSII apresentou aumento nas plantas do grupo CSI em relação às plantas sem suspensão da irrigação (SSI). O rendimento quântico de dissipação não regulada de energia não fotoquímica do PSII e os teores de clorofilas e carotenoides não apresentaram alterações entre as plantas CSI e SSI ao longo dos ciclos S/R. Observa-se, assim, que a macaúba apresenta um eficiente mecanismo de dissipação de energia não fotoquímica.Embrapa Florestas2016-09-30info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/106110.4336/2016.pfb.36.87.1061Pesquisa Florestal Brasileira; v. 36 n. 87 (2016): jul./set.; 225-234Pesquisa Florestal Brasileira; Vol. 36 No. 87 (2016): jul./set.; 225-2341983-26051809-3647reponame:Pesquisa Florestal Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1061/507Copyright (c) 2016 Clenilso Sehnen Mota, Marco Antonio Oliva Canohttps://creativecommons.org/licenses/by-nc-nd/4.0info:eu-repo/semantics/openAccessMota, Clenilso SehnenOliva Cano, Marco Antonio2017-04-28T14:13:12Zoai:pfb.cnpf.embrapa.br/pfb:article/1061Revistahttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/PUBhttps://pfb.cnpf.embrapa.br/pfb/index.php/pfb/oaipfb@embrapa.br || revista.pfb@gmail.com || patricia.mattos@embrapa.br1983-26051809-3647opendoar:2017-04-28T14:13:12Pesquisa Florestal Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Physiological responses of macaúba young plants to cyclical drought conditions
Respostas fisiológicas de plantas jovens de macaúba a condições de seca cíclica
title Physiological responses of macaúba young plants to cyclical drought conditions
spellingShingle Physiological responses of macaúba young plants to cyclical drought conditions
Mota, Clenilso Sehnen
Acrocomia aculeata
Energy balance
Osmolytes
Acrocomia aculeata
Balanço energético
Osmólitos
title_short Physiological responses of macaúba young plants to cyclical drought conditions
title_full Physiological responses of macaúba young plants to cyclical drought conditions
title_fullStr Physiological responses of macaúba young plants to cyclical drought conditions
title_full_unstemmed Physiological responses of macaúba young plants to cyclical drought conditions
title_sort Physiological responses of macaúba young plants to cyclical drought conditions
author Mota, Clenilso Sehnen
author_facet Mota, Clenilso Sehnen
Oliva Cano, Marco Antonio
author_role author
author2 Oliva Cano, Marco Antonio
author2_role author
dc.contributor.author.fl_str_mv Mota, Clenilso Sehnen
Oliva Cano, Marco Antonio
dc.subject.por.fl_str_mv Acrocomia aculeata
Energy balance
Osmolytes
Acrocomia aculeata
Balanço energético
Osmólitos
topic Acrocomia aculeata
Energy balance
Osmolytes
Acrocomia aculeata
Balanço energético
Osmólitos
description The objective of this study was to evaluate the impact of three cycles of drought/irrigation on the quantum yields of chlorophyll a fluorescence, proline accumulation and osmotic adjustment. Ten plants were submitted to three consecutive cycles of drought/irrigation (D/I) and the other ten were maintained at field capacity.Cycles D/I did not promote osmotic adjustment in plants with suspension of irrigation (WSI), despite the proline accumulation. The minimum fluorescence adapted to dark increased and the maximum quantum efficiency of PSII was reduced in WSI plants. Quantum yield of photochemical energy conversion of photosystem II (PSII) and the apparent rate of electron transport decreased, while quantum yield dissipation regulated non-photochemical energy in PSII showed an increase in WSI plants over those without suspension of irrigation (WOSI). Quantum yield of no regulated dissipation of PSII non-photochemical energy and chlorophyll and carotenoid content showed no change between WSI and WOSI plants over D/I cycles. Thus it was observed that macaubeira presents an efficient mechanism of non-photochemical energy dissipation.
publishDate 2016
dc.date.none.fl_str_mv 2016-09-30
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1061
10.4336/2016.pfb.36.87.1061
url https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1061
identifier_str_mv 10.4336/2016.pfb.36.87.1061
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1061/507
dc.rights.driver.fl_str_mv Copyright (c) 2016 Clenilso Sehnen Mota, Marco Antonio Oliva Cano
https://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2016 Clenilso Sehnen Mota, Marco Antonio Oliva Cano
https://creativecommons.org/licenses/by-nc-nd/4.0
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Embrapa Florestas
publisher.none.fl_str_mv Embrapa Florestas
dc.source.none.fl_str_mv Pesquisa Florestal Brasileira; v. 36 n. 87 (2016): jul./set.; 225-234
Pesquisa Florestal Brasileira; Vol. 36 No. 87 (2016): jul./set.; 225-234
1983-2605
1809-3647
reponame:Pesquisa Florestal Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Florestal Brasileira (Online)
collection Pesquisa Florestal Brasileira (Online)
repository.name.fl_str_mv Pesquisa Florestal Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pfb@embrapa.br || revista.pfb@gmail.com || patricia.mattos@embrapa.br
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