PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Revista Caatinga |
Texto Completo: | https://periodicos.ufersa.edu.br/caatinga/article/view/5694 |
Resumo: | The objective of this study was to characterize the physiological acclimation responses of young plants of the dwarf coconut cultivar ‘Jiqui Green’ associated with tolerance to conditions of multiple abiotic stresses (drought and soil salinity), acting either independently or in combination. The study was conducted under controlled conditions and evaluated the following parameters: leaf gas exchange, quantum yield of chlorophyll a fluorescence, and relative contents of total chlorophyll (SPAD index). The experiment was conducted under a randomized block experimental design, in a split plot arrangement. In the plots, plants were exposed to different levels of water stress, by imposing potential crop evapotranspiration replacement levels equivalent to 100%, 80%, 60%, 40%, and 20%, whereas in subplots, plants were exposed to different levels of soil salinity (1.72, 6.25, 25.80, and 40.70 dS m-1). Physiological mechanisms were effectively limited when water deficit and salinity acted separately and/or together. Compared with soil salinity, water stress was more effective in reducing the measured physiological parameters. The magnitudes of the responses of plants to water supply and salinity depended on the intensity of stress and evaluation period. The physiological acclimation responses of plants were mainly related to stomatal regulation. The coconut tree has a number of physiological adjustment mechanisms that give the species partial tolerance to drought stress and/or salt, thereby enabling it to revegetate salinated areas, provided that its water requirements are at least partially met. |
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PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILSRESPOSTAS FISIOLÓGICAS DE PLANTAS DE COQUEIRO ANÃO SOB DEFICIÊNCIA HÍDRICA, EM SOLOS AFETADOS POR SAISCocos nucifera L.. Estresses hídrico e salino. Fisiologia.Cocos nucifera L.. Water and salt stress. Physiology.The objective of this study was to characterize the physiological acclimation responses of young plants of the dwarf coconut cultivar ‘Jiqui Green’ associated with tolerance to conditions of multiple abiotic stresses (drought and soil salinity), acting either independently or in combination. The study was conducted under controlled conditions and evaluated the following parameters: leaf gas exchange, quantum yield of chlorophyll a fluorescence, and relative contents of total chlorophyll (SPAD index). The experiment was conducted under a randomized block experimental design, in a split plot arrangement. In the plots, plants were exposed to different levels of water stress, by imposing potential crop evapotranspiration replacement levels equivalent to 100%, 80%, 60%, 40%, and 20%, whereas in subplots, plants were exposed to different levels of soil salinity (1.72, 6.25, 25.80, and 40.70 dS m-1). Physiological mechanisms were effectively limited when water deficit and salinity acted separately and/or together. Compared with soil salinity, water stress was more effective in reducing the measured physiological parameters. The magnitudes of the responses of plants to water supply and salinity depended on the intensity of stress and evaluation period. The physiological acclimation responses of plants were mainly related to stomatal regulation. The coconut tree has a number of physiological adjustment mechanisms that give the species partial tolerance to drought stress and/or salt, thereby enabling it to revegetate salinated areas, provided that its water requirements are at least partially met.Objetivou-se, com este trabalho, caracterizar as repostas fisiológicas aclimatativas de plantas jovens de coqueiro Anão, cultivar “Verde do Jiqui”, associadas com a sua tolerância às condições de múltiplos estresses abióticos (deficiência hídrica e salinidade do solo), atuando isolados e/ou combinados. O estudo foi realizado sob condições controladas e avaliaram-se: as trocas gasosas foliares, o rendimento quântico da fluorescência da clorofila a e os teores relativos de clorofila total (índice Spad). O experimento foi conduzido sob delineamento estatístico de blocos casualizados, no arranjo de parcelas subdivididas, sendo as parcelas constituídas por diferentes níveis de deficiência hídrica, mediante a imposição de cinco distintos percentuais de reposição das perdas de água por evapotranspiração potencial da cultura (100; 80; 60; 40 e 20%) e as subparcelas constituídas pelos crescentes níveis de salinidade do solo (1,72; 6,25; 25,80 e 40,70 dS m-1). Os mecanismos fisiológicos são efetivamente limitados quando a deficiência hídrica e a salinidade atuam isoladamente e/ou em conjunto. Os efeitos do estresse hídrico se mostram mais efetivos nos comprometimentos dos parâmetros fisiológicos, em detrimento à salinidade do solo. As magnitudes das respostas das plantas ao suprimento hídrico e à salinidade dependem das intensidades dos estresses e das épocas de avaliação. As respostas fisiológicas aclimatativas das plantas estão relacionadas, principalmente, à regulação estomática. O coqueiro apresenta uma série de mecanismos de ajustes fisiológicos que conferem à espécie uma parcial tolerância ao estresse hídrico e/ou salino, tornando-a capaz de revegetar áreas salinizadas, desde que as necessidades hídricas sejam ao menos parcialmente atendidas.Universidade Federal Rural do Semi-Árido2017-01-24info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://periodicos.ufersa.edu.br/caatinga/article/view/569410.1590/1983-21252017v30n220rcREVISTA CAATINGA; Vol. 30 No. 2 (2017); 347-457Revista Caatinga; v. 30 n. 2 (2017); 347-4571983-21250100-316Xreponame:Revista Caatingainstname:Universidade Federal Rural do Semi-Árido (UFERSA)instacron:UFERSAenghttps://periodicos.ufersa.edu.br/caatinga/article/view/5694/pdfSilva, Alexandre Reuber Almeida daBezerra, Francisco Marcus LimaLacerda, Claudivan Feitosa deSousa, Carlos Henrique Carvalho deBezerra, Malos Alvesinfo:eu-repo/semantics/openAccess2023-07-20T10:56:51Zoai:ojs.periodicos.ufersa.edu.br:article/5694Revistahttps://periodicos.ufersa.edu.br/index.php/caatinga/indexPUBhttps://periodicos.ufersa.edu.br/index.php/caatinga/oaipatricio@ufersa.edu.br|| caatinga@ufersa.edu.br1983-21250100-316Xopendoar:2024-04-29T09:46:23.914897Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA)true |
dc.title.none.fl_str_mv |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS RESPOSTAS FISIOLÓGICAS DE PLANTAS DE COQUEIRO ANÃO SOB DEFICIÊNCIA HÍDRICA, EM SOLOS AFETADOS POR SAIS |
title |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS |
spellingShingle |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS Silva, Alexandre Reuber Almeida da Cocos nucifera L.. Estresses hídrico e salino. Fisiologia. Cocos nucifera L.. Water and salt stress. Physiology. |
title_short |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS |
title_full |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS |
title_fullStr |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS |
title_full_unstemmed |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS |
title_sort |
PHYSIOLOGICAL RESPONSES OF DWARF COCONUT PLANTS UNDER WATER DEFICIT IN SALT-AFFECTED SOILS |
author |
Silva, Alexandre Reuber Almeida da |
author_facet |
Silva, Alexandre Reuber Almeida da Bezerra, Francisco Marcus Lima Lacerda, Claudivan Feitosa de Sousa, Carlos Henrique Carvalho de Bezerra, Malos Alves |
author_role |
author |
author2 |
Bezerra, Francisco Marcus Lima Lacerda, Claudivan Feitosa de Sousa, Carlos Henrique Carvalho de Bezerra, Malos Alves |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Silva, Alexandre Reuber Almeida da Bezerra, Francisco Marcus Lima Lacerda, Claudivan Feitosa de Sousa, Carlos Henrique Carvalho de Bezerra, Malos Alves |
dc.subject.por.fl_str_mv |
Cocos nucifera L.. Estresses hídrico e salino. Fisiologia. Cocos nucifera L.. Water and salt stress. Physiology. |
topic |
Cocos nucifera L.. Estresses hídrico e salino. Fisiologia. Cocos nucifera L.. Water and salt stress. Physiology. |
description |
The objective of this study was to characterize the physiological acclimation responses of young plants of the dwarf coconut cultivar ‘Jiqui Green’ associated with tolerance to conditions of multiple abiotic stresses (drought and soil salinity), acting either independently or in combination. The study was conducted under controlled conditions and evaluated the following parameters: leaf gas exchange, quantum yield of chlorophyll a fluorescence, and relative contents of total chlorophyll (SPAD index). The experiment was conducted under a randomized block experimental design, in a split plot arrangement. In the plots, plants were exposed to different levels of water stress, by imposing potential crop evapotranspiration replacement levels equivalent to 100%, 80%, 60%, 40%, and 20%, whereas in subplots, plants were exposed to different levels of soil salinity (1.72, 6.25, 25.80, and 40.70 dS m-1). Physiological mechanisms were effectively limited when water deficit and salinity acted separately and/or together. Compared with soil salinity, water stress was more effective in reducing the measured physiological parameters. The magnitudes of the responses of plants to water supply and salinity depended on the intensity of stress and evaluation period. The physiological acclimation responses of plants were mainly related to stomatal regulation. The coconut tree has a number of physiological adjustment mechanisms that give the species partial tolerance to drought stress and/or salt, thereby enabling it to revegetate salinated areas, provided that its water requirements are at least partially met. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-24 |
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://periodicos.ufersa.edu.br/caatinga/article/view/5694 10.1590/1983-21252017v30n220rc |
url |
https://periodicos.ufersa.edu.br/caatinga/article/view/5694 |
identifier_str_mv |
10.1590/1983-21252017v30n220rc |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://periodicos.ufersa.edu.br/caatinga/article/view/5694/pdf |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido |
dc.source.none.fl_str_mv |
REVISTA CAATINGA; Vol. 30 No. 2 (2017); 347-457 Revista Caatinga; v. 30 n. 2 (2017); 347-457 1983-2125 0100-316X reponame:Revista Caatinga instname:Universidade Federal Rural do Semi-Árido (UFERSA) instacron:UFERSA |
instname_str |
Universidade Federal Rural do Semi-Árido (UFERSA) |
instacron_str |
UFERSA |
institution |
UFERSA |
reponame_str |
Revista Caatinga |
collection |
Revista Caatinga |
repository.name.fl_str_mv |
Revista Caatinga - Universidade Federal Rural do Semi-Árido (UFERSA) |
repository.mail.fl_str_mv |
patricio@ufersa.edu.br|| caatinga@ufersa.edu.br |
_version_ |
1797674026054713344 |