Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana

Detalhes bibliográficos
Autor(a) principal: Oliveira, Érica Caldas Silva de
Data de Publicação: 2014
Outros Autores: Júnior, Everaldo Oliveira Costa, Fernandes, Pedro Dantas, Trajano, Érika Veruschka de A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Iheringia. Série Botânica
Texto Completo: https://isb.emnuvens.com.br/iheringia/article/view/108
Resumo: We conducted a study on the ecophysiological parameters of natural populations of Cnidoscolus quercifolius Pohl in the municipalities of Santa Luzia and São Mamede. The research was undertaken between 2009 and 2011, and photochemical quantum effi ciency of photosystem II and water potential in seasonal wet and dry periods were analyzed. In the study of photosynthetic effi ciency, we used fl uorescence measurements, and to study the water potential, we used the Scholander pump. There was a decrease in photosynthetic effi ciency related to photosystem II, with values of 0.591 and 0.616, and mean values of water potential that were negative during dry months, -1.3714 MPa (July/ August 2009, Population 1), and -1.52 MPa (September/October 2010, Population 2). C. quercifolius presented related determinant physiological conditions of water stress, with low mean photosynthetic quantum effi ciency values, indicative of damage in photosystem II, associated with low levels of osmotic potential, revealing an osmotic adjustment to limiting environmental conditions
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spelling Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga ParaibanaCnidoscolusecophysiologyfaveleiraphytochemicalsemiaridCnidoscolusecofi siologiafaveleirafotoquímicasemiáridoWe conducted a study on the ecophysiological parameters of natural populations of Cnidoscolus quercifolius Pohl in the municipalities of Santa Luzia and São Mamede. The research was undertaken between 2009 and 2011, and photochemical quantum effi ciency of photosystem II and water potential in seasonal wet and dry periods were analyzed. In the study of photosynthetic effi ciency, we used fl uorescence measurements, and to study the water potential, we used the Scholander pump. There was a decrease in photosynthetic effi ciency related to photosystem II, with values of 0.591 and 0.616, and mean values of water potential that were negative during dry months, -1.3714 MPa (July/ August 2009, Population 1), and -1.52 MPa (September/October 2010, Population 2). C. quercifolius presented related determinant physiological conditions of water stress, with low mean photosynthetic quantum effi ciency values, indicative of damage in photosystem II, associated with low levels of osmotic potential, revealing an osmotic adjustment to limiting environmental conditionsRealizou-se um estudo de parâmetros ecofi siológicos em populações naturais de Cnidoscolus quercifolius Pohl nos municípios de Santa Luzia e São Mamede. A pesquisa foi desenvolvida nos anos de 2009 a 2011, abordando a análise da efi ciência quântica fotoquímica do fotossistema II e potencial hídrico em períodos chuvoso e seco. No estudo de efi ciência fotossintética foi utilizado um medidor de fl uorescência, e para o estudo do potencial hídrico utilizou-se a bomba de Scholander. Houve redução da efi ciência fotossintética relacionada ao fotossistema II, com valores médios de 0,591 e 0,616, e valores médios de potencial hídrico negativo nos meses de estiagem, -1,3714 MPa (Jul/Ago-2009, População 1), e -1,52 MPa (Set/Out-2010, População 2). Cnidoscolus quercifolius apresentou condições fi siológicas determinantes de estresse hídrico com valores médios de efi ciência quântica fotossintética muito baixos, indicativos de danos ao fotossistema II, associados a baixos índices de potencial osmótico, revelando um ajuste osmótico às condições limitantes do ambiente.Iheringia. Série Botânica.Iheringia, Série Botânica.2014-12-19info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://isb.emnuvens.com.br/iheringia/article/view/108Iheringia. Série Botânica.; Vol. 69 No. 2 (2014); 479-487Iheringia, Série Botânica.; v. 69 n. 2 (2014); 479-4872446-82310073-4705reponame:Iheringia. Série Botânicainstname:Fundação Zoobotânica do Rio Grande do Sul (FZB/RS)instacron:FZB/RSenghttps://isb.emnuvens.com.br/iheringia/article/view/108/115Copyright (c) 2015 Iheringia. Série Botânica.info:eu-repo/semantics/openAccessOliveira, Érica Caldas Silva deJúnior, Everaldo Oliveira CostaFernandes, Pedro DantasTrajano, Érika Veruschka de A.2016-07-06T20:02:10Zoai:ojs.emnuvens.com.br:article/108Revistahttps://isb.emnuvens.com.br/iheringiaONGhttps://isb.emnuvens.com.br/iheringia/oai||iheringia-bot@fzb.rs.gov.br2446-82310073-4705opendoar:2016-07-06T20:02:10Iheringia. Série Botânica - Fundação Zoobotânica do Rio Grande do Sul (FZB/RS)false
dc.title.none.fl_str_mv Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
title Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
spellingShingle Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
Oliveira, Érica Caldas Silva de
Cnidoscolus
ecophysiology
faveleira
phytochemical
semiarid
Cnidoscolus
ecofi siologia
faveleira
fotoquímica
semiárido
title_short Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
title_full Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
title_fullStr Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
title_full_unstemmed Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
title_sort Photochemical efficiency of photosystem II (PSII) and Water Potential of Cnidoscolus quercifolius Pohl in areas of Caatinga Paraibana
author Oliveira, Érica Caldas Silva de
author_facet Oliveira, Érica Caldas Silva de
Júnior, Everaldo Oliveira Costa
Fernandes, Pedro Dantas
Trajano, Érika Veruschka de A.
author_role author
author2 Júnior, Everaldo Oliveira Costa
Fernandes, Pedro Dantas
Trajano, Érika Veruschka de A.
author2_role author
author
author
dc.contributor.author.fl_str_mv Oliveira, Érica Caldas Silva de
Júnior, Everaldo Oliveira Costa
Fernandes, Pedro Dantas
Trajano, Érika Veruschka de A.
dc.subject.por.fl_str_mv Cnidoscolus
ecophysiology
faveleira
phytochemical
semiarid
Cnidoscolus
ecofi siologia
faveleira
fotoquímica
semiárido
topic Cnidoscolus
ecophysiology
faveleira
phytochemical
semiarid
Cnidoscolus
ecofi siologia
faveleira
fotoquímica
semiárido
description We conducted a study on the ecophysiological parameters of natural populations of Cnidoscolus quercifolius Pohl in the municipalities of Santa Luzia and São Mamede. The research was undertaken between 2009 and 2011, and photochemical quantum effi ciency of photosystem II and water potential in seasonal wet and dry periods were analyzed. In the study of photosynthetic effi ciency, we used fl uorescence measurements, and to study the water potential, we used the Scholander pump. There was a decrease in photosynthetic effi ciency related to photosystem II, with values of 0.591 and 0.616, and mean values of water potential that were negative during dry months, -1.3714 MPa (July/ August 2009, Population 1), and -1.52 MPa (September/October 2010, Population 2). C. quercifolius presented related determinant physiological conditions of water stress, with low mean photosynthetic quantum effi ciency values, indicative of damage in photosystem II, associated with low levels of osmotic potential, revealing an osmotic adjustment to limiting environmental conditions
publishDate 2014
dc.date.none.fl_str_mv 2014-12-19
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://isb.emnuvens.com.br/iheringia/article/view/108
url https://isb.emnuvens.com.br/iheringia/article/view/108
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://isb.emnuvens.com.br/iheringia/article/view/108/115
dc.rights.driver.fl_str_mv Copyright (c) 2015 Iheringia. Série Botânica.
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2015 Iheringia. Série Botânica.
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Iheringia. Série Botânica.
Iheringia, Série Botânica.
publisher.none.fl_str_mv Iheringia. Série Botânica.
Iheringia, Série Botânica.
dc.source.none.fl_str_mv Iheringia. Série Botânica.; Vol. 69 No. 2 (2014); 479-487
Iheringia, Série Botânica.; v. 69 n. 2 (2014); 479-487
2446-8231
0073-4705
reponame:Iheringia. Série Botânica
instname:Fundação Zoobotânica do Rio Grande do Sul (FZB/RS)
instacron:FZB/RS
instname_str Fundação Zoobotânica do Rio Grande do Sul (FZB/RS)
instacron_str FZB/RS
institution FZB/RS
reponame_str Iheringia. Série Botânica
collection Iheringia. Série Botânica
repository.name.fl_str_mv Iheringia. Série Botânica - Fundação Zoobotânica do Rio Grande do Sul (FZB/RS)
repository.mail.fl_str_mv ||iheringia-bot@fzb.rs.gov.br
_version_ 1798948134721683456

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