Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions

Detalhes bibliográficos
Autor(a) principal: Scalon,Silvana de Paula Quintão
Data de Publicação: 2020
Outros Autores: Kodama,Flávia Mitsuko, Dresch,Daiane Mugnol, Pereira,Zefa Valdivina, Mussury,Rosilda Mara, Scalon,Lourenço Quintão
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Floresta e Ambiente
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-80872020000200116
Resumo: Abstract In this study, we assessed the gas exchange in Caryocar brasiliense seedlings in water deficit conditions and their capacity to recover after rehydration. We assessed plant photosynthetic rates, internal carbon concentrations, stomatal conductance, transpiration rates, water-use efficiency, instantaneous carboxylation efficiency, chlorophyll index, and photosystem II quantum efficiency. All gas exchange parameters were reduced after the suspension of irrigation. Seedling photosynthetic rates approached zero after 12 days. The equilibrium was reestablished in all variables 11 days after re-initiating irrigation, with the exception of internal CO2 concentration and stomatal conductance. Exposure of seedlings to water stress resulted in drastically reduced photosynthetic processes. This reduction occurred due to the limitation of stomatal conductance and low rubisco carboxylation efficiency but not to irreversible damage photosystem II. All of these parameters demonstrated recuperation with rehydration, but only the photosynthetic rates reached initial control values.
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spelling Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditionshydric stressnative fruitPequiCaryocaceaeAbstract In this study, we assessed the gas exchange in Caryocar brasiliense seedlings in water deficit conditions and their capacity to recover after rehydration. We assessed plant photosynthetic rates, internal carbon concentrations, stomatal conductance, transpiration rates, water-use efficiency, instantaneous carboxylation efficiency, chlorophyll index, and photosystem II quantum efficiency. All gas exchange parameters were reduced after the suspension of irrigation. Seedling photosynthetic rates approached zero after 12 days. The equilibrium was reestablished in all variables 11 days after re-initiating irrigation, with the exception of internal CO2 concentration and stomatal conductance. Exposure of seedlings to water stress resulted in drastically reduced photosynthetic processes. This reduction occurred due to the limitation of stomatal conductance and low rubisco carboxylation efficiency but not to irreversible damage photosystem II. All of these parameters demonstrated recuperation with rehydration, but only the photosynthetic rates reached initial control values.Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro2020-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-80872020000200116Floresta e Ambiente v.27 n.2 2020reponame:Floresta e Ambienteinstname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJ10.1590/2179-8087.052017info:eu-repo/semantics/openAccessScalon,Silvana de Paula QuintãoKodama,Flávia MitsukoDresch,Daiane MugnolPereira,Zefa ValdivinaMussury,Rosilda MaraScalon,Lourenço Quintãoeng2020-08-05T00:00:00Zoai:scielo:S2179-80872020000200116Revistahttps://www.floram.org/PUBhttps://old.scielo.br/oai/scielo-oai.phpfloramjournal@gmail.com||floram@ufrrj.br||2179-80871415-0980opendoar:2020-08-05T00:00Floresta e Ambiente - Universidade Federal do Rio de Janeiro (UFRJ)false
dc.title.none.fl_str_mv Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
title Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
spellingShingle Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
Scalon,Silvana de Paula Quintão
hydric stress
native fruit
Pequi
Caryocaceae
title_short Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
title_full Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
title_fullStr Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
title_full_unstemmed Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
title_sort Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions
author Scalon,Silvana de Paula Quintão
author_facet Scalon,Silvana de Paula Quintão
Kodama,Flávia Mitsuko
Dresch,Daiane Mugnol
Pereira,Zefa Valdivina
Mussury,Rosilda Mara
Scalon,Lourenço Quintão
author_role author
author2 Kodama,Flávia Mitsuko
Dresch,Daiane Mugnol
Pereira,Zefa Valdivina
Mussury,Rosilda Mara
Scalon,Lourenço Quintão
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Scalon,Silvana de Paula Quintão
Kodama,Flávia Mitsuko
Dresch,Daiane Mugnol
Pereira,Zefa Valdivina
Mussury,Rosilda Mara
Scalon,Lourenço Quintão
dc.subject.por.fl_str_mv hydric stress
native fruit
Pequi
Caryocaceae
topic hydric stress
native fruit
Pequi
Caryocaceae
description Abstract In this study, we assessed the gas exchange in Caryocar brasiliense seedlings in water deficit conditions and their capacity to recover after rehydration. We assessed plant photosynthetic rates, internal carbon concentrations, stomatal conductance, transpiration rates, water-use efficiency, instantaneous carboxylation efficiency, chlorophyll index, and photosystem II quantum efficiency. All gas exchange parameters were reduced after the suspension of irrigation. Seedling photosynthetic rates approached zero after 12 days. The equilibrium was reestablished in all variables 11 days after re-initiating irrigation, with the exception of internal CO2 concentration and stomatal conductance. Exposure of seedlings to water stress resulted in drastically reduced photosynthetic processes. This reduction occurred due to the limitation of stomatal conductance and low rubisco carboxylation efficiency but not to irreversible damage photosystem II. All of these parameters demonstrated recuperation with rehydration, but only the photosynthetic rates reached initial control values.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-80872020000200116
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2179-80872020000200116
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/2179-8087.052017
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro
publisher.none.fl_str_mv Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro
dc.source.none.fl_str_mv Floresta e Ambiente v.27 n.2 2020
reponame:Floresta e Ambiente
instname:Universidade Federal do Rio de Janeiro (UFRJ)
instacron:UFRJ
instname_str Universidade Federal do Rio de Janeiro (UFRJ)
instacron_str UFRJ
institution UFRJ
reponame_str Floresta e Ambiente
collection Floresta e Ambiente
repository.name.fl_str_mv Floresta e Ambiente - Universidade Federal do Rio de Janeiro (UFRJ)
repository.mail.fl_str_mv floramjournal@gmail.com||floram@ufrrj.br||
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