Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions

Detalhes bibliográficos
Autor(a) principal: Melo, Emanuelle Ferreira
Data de Publicação: 2014
Outros Autores: Fernandes-Brum, Christiane Noronha, Pereira, Fabrício José, Castro, Evaristo Mauro de, Chalfun-Júnior, Antonio
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/12451
Resumo: Due to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards. Re-irrigation promoted a partial recovery of the plant water potential. Non-irrigated plants showed an increase in stomatal resistance and reduction of transpiration and nitrate reductase activity. In the roots, there was a decrease in nitrate reductase activity under water stress. Leaf anatomical modifications were significant only for the adaxial surface epidermis and palisade parenchyma thickness, this latter characteristic being higher in control plants. Stomatal density and polar and equatorial diameter ratios showed the highest values in plants under water stress. In the roots, differences only in the cortex thickness being bigger in the non-irrigated treatment could be observed. Therefore, Siriema coffee plants under water stress show physiological, biochemical and anatomical modifications that contribute to the tolerance of this genotype to these conditions.
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spelling Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditionsModificações anatômicas e fisiológicas em mudas de Coffea arábica cultivar Siriema submetidas ao déficit hidricoCoffee treeCoffee - EcophysiologyWater stressNitrate reductaseCafeeiroCafeeiro - EcofisiologiaEstresse hídricoRedutase do nitratoDue to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards. Re-irrigation promoted a partial recovery of the plant water potential. Non-irrigated plants showed an increase in stomatal resistance and reduction of transpiration and nitrate reductase activity. In the roots, there was a decrease in nitrate reductase activity under water stress. Leaf anatomical modifications were significant only for the adaxial surface epidermis and palisade parenchyma thickness, this latter characteristic being higher in control plants. Stomatal density and polar and equatorial diameter ratios showed the highest values in plants under water stress. In the roots, differences only in the cortex thickness being bigger in the non-irrigated treatment could be observed. Therefore, Siriema coffee plants under water stress show physiological, biochemical and anatomical modifications that contribute to the tolerance of this genotype to these conditions.Em razão do prognóstico de mudanças climáticas nos próximos anos, a compreensão do déficit hídrico e das respostas fisiológicas de plantas ao mesmo, torna-se uma importante condição para o desenvolvimento de tecnologias, como mecanismos que auxiliem as plantas a suportar períodos mais longos de seca, o que será essencial para a manutenção da produção mundial e brasileira. Neste estudo, objetivou-se avaliar aspectos ecofisiológicos e anatômicos além da atividade da redutase do nitrato em mudas de café Siriema submetidas a quatro tratamentos: irrigadas diariamente, não irrigadas, re-irrigadas 24 horas e re-irrigadas 48 horas após os diferentes períodos de estresse. A ausência de irrigação promoveu redução no potencial hídrico foliar, sendo mais acentuada a partir do nono dia de avaliação. A re-irrigação das mudas promoveu uma recuperação parcial do estado hídrico das plantas. Nas plantas não irrigadas observou-se um aumento na resistência estomatal e diminuição da transpiração, reduzindo a atividade da redutase do nitrato nas folhas. Nas raízes, houve um declínio na redutase do nitrato sob estresse hídrico. Ocorreram modificações na anatomia foliar apenas na espessura da epiderme da face adaxial e parenquimama paliçádico, sendo maior nas plantas controle. A densidade estomatal e razão diâmetro polar e equatorial demonstraram maiores valores nas plantas sob déficit hídrico. Nas raízes, foi observada diferença apenas na espessura do córtex, sendo esta maior no tratamento não irrigado. Dessa forma, o café Siriema sob condições de estresse hídrico apresenta modificações fisiológicas, bioquímicas e anatômicas que contribuem para a tolerância desse genótipo nessas condições.Universidade Federal de Lavras2017-03-09T19:14:04Z2017-03-09T19:14:04Z2014-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfMELO, E. F. et al. Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions. Ciência e Agrotecnologia, Lavras, v. 38, n. 1, p. 25-33, jan. 2014.http://repositorio.ufla.br/jspui/handle/1/12451Ciência e Agrotecnologiareponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAMelo, Emanuelle FerreiraFernandes-Brum, Christiane NoronhaPereira, Fabrício JoséCastro, Evaristo Mauro deChalfun-Júnior, Antonioinfo:eu-repo/semantics/openAccesspor2017-03-09T19:14:04Zoai:localhost:1/12451Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2017-03-09T19:14:04Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
Modificações anatômicas e fisiológicas em mudas de Coffea arábica cultivar Siriema submetidas ao déficit hidrico
title Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
spellingShingle Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
Melo, Emanuelle Ferreira
Coffee tree
Coffee - Ecophysiology
Water stress
Nitrate reductase
Cafeeiro
Cafeeiro - Ecofisiologia
Estresse hídrico
Redutase do nitrato
title_short Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
title_full Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
title_fullStr Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
title_full_unstemmed Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
title_sort Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions
author Melo, Emanuelle Ferreira
author_facet Melo, Emanuelle Ferreira
Fernandes-Brum, Christiane Noronha
Pereira, Fabrício José
Castro, Evaristo Mauro de
Chalfun-Júnior, Antonio
author_role author
author2 Fernandes-Brum, Christiane Noronha
Pereira, Fabrício José
Castro, Evaristo Mauro de
Chalfun-Júnior, Antonio
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Melo, Emanuelle Ferreira
Fernandes-Brum, Christiane Noronha
Pereira, Fabrício José
Castro, Evaristo Mauro de
Chalfun-Júnior, Antonio
dc.subject.por.fl_str_mv Coffee tree
Coffee - Ecophysiology
Water stress
Nitrate reductase
Cafeeiro
Cafeeiro - Ecofisiologia
Estresse hídrico
Redutase do nitrato
topic Coffee tree
Coffee - Ecophysiology
Water stress
Nitrate reductase
Cafeeiro
Cafeeiro - Ecofisiologia
Estresse hídrico
Redutase do nitrato
description Due to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards. Re-irrigation promoted a partial recovery of the plant water potential. Non-irrigated plants showed an increase in stomatal resistance and reduction of transpiration and nitrate reductase activity. In the roots, there was a decrease in nitrate reductase activity under water stress. Leaf anatomical modifications were significant only for the adaxial surface epidermis and palisade parenchyma thickness, this latter characteristic being higher in control plants. Stomatal density and polar and equatorial diameter ratios showed the highest values in plants under water stress. In the roots, differences only in the cortex thickness being bigger in the non-irrigated treatment could be observed. Therefore, Siriema coffee plants under water stress show physiological, biochemical and anatomical modifications that contribute to the tolerance of this genotype to these conditions.
publishDate 2014
dc.date.none.fl_str_mv 2014-01
2017-03-09T19:14:04Z
2017-03-09T19:14:04Z
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 MELO, E. F. et al. Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions. Ciência e Agrotecnologia, Lavras, v. 38, n. 1, p. 25-33, jan. 2014.
http://repositorio.ufla.br/jspui/handle/1/12451
identifier_str_mv MELO, E. F. et al. Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions. Ciência e Agrotecnologia, Lavras, v. 38, n. 1, p. 25-33, jan. 2014.
url http://repositorio.ufla.br/jspui/handle/1/12451
dc.language.iso.fl_str_mv por
language por
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 de Lavras
publisher.none.fl_str_mv Universidade Federal de Lavras
dc.source.none.fl_str_mv Ciência e Agrotecnologia
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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