Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico

Detalhes bibliográficos
Autor(a) principal: Avelar, Rafaella de Paula
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/29147
Resumo: Coffee cultivation has historically been a major economic activity in Brazil, and Brazil is currently the world's largest producer and exporter of coffee. Coffee trees show flowering of the gregarious type, that is, all plants bloom at the same time in a c ertain region, however, the number of flowering events is variable, from few events like it occurs in Brazil, to many events as it occurs in Colombia. Asynchronous flowering causes difficulties related to partial harvesting, disease control, pest control, reduction in grain quality, and increases harvesting costs. Coffee flowering is divided into three stages: floral initiation or differentiation, rest or quiescence, and floral opening, or anthesis, being triggered by precipitation or irrigation after a period of water deficit. The response to rehydration has been associated with an increase in ethylene levels. This increase may be involved in the control of coffee anthesis promotion.There is evidence that this increase may be related to the transport of the ethylene precursor (ACC) from the roots to the shoot via the vascular system. However, the effect of water deficit on the regulation of ethylene and on vascular system development is poorly understood. T herefore, studies in this sense are fundamental to understand the mechanism of ethylene regulationand the development of the vascular system in plants under water deficit. The elucidation of these mechanisms may help to understand the influence of ethylene on flowering in future works. In this way ,this study tested the hypothesis that rehydration causes a great increase in the ethylene production in the shoot and that water deficit affects the development of the vascular system in leaves of coffee trees. To test this hypothesis, analyzes of gene expression and anatomy were performed. In the gene expression analyzes, the expression levels of ethylene biosynthesis and signaling genes in well-wateredand water deficit plants, as well as after plant rehydration, were analyzed. In the anatomical analyzes, cross sections were made in young leaves of well-watered and water deficit plants. The gene expression analyzes suggest that plants under water deficit show a reductionin the production of ethylene in the shoot and an increase the synthesis of ACC in the root. In addition, it is suggested that rehydration causes a reduction of the ethylene production in the leaves, followed by an increase in their synthesis. Anatomical data indicate s that leaves from plants growing under water deficit have a larger number of xylem vessels and larger phloem area.
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spelling Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídricoEthylene regulation in coffee plants grown under different levels of water deficitCafé - Déficit hídricoCafeeiro - FlorescimentoCafeeiro - EtilenoCafeeiro - ReidrataçãoCoffee - Water deficitCoffee - FloweringCoffee - EthyleneCoffee - RehydrationFisiologia VegetalCoffee cultivation has historically been a major economic activity in Brazil, and Brazil is currently the world's largest producer and exporter of coffee. Coffee trees show flowering of the gregarious type, that is, all plants bloom at the same time in a c ertain region, however, the number of flowering events is variable, from few events like it occurs in Brazil, to many events as it occurs in Colombia. Asynchronous flowering causes difficulties related to partial harvesting, disease control, pest control, reduction in grain quality, and increases harvesting costs. Coffee flowering is divided into three stages: floral initiation or differentiation, rest or quiescence, and floral opening, or anthesis, being triggered by precipitation or irrigation after a period of water deficit. The response to rehydration has been associated with an increase in ethylene levels. This increase may be involved in the control of coffee anthesis promotion.There is evidence that this increase may be related to the transport of the ethylene precursor (ACC) from the roots to the shoot via the vascular system. However, the effect of water deficit on the regulation of ethylene and on vascular system development is poorly understood. T herefore, studies in this sense are fundamental to understand the mechanism of ethylene regulationand the development of the vascular system in plants under water deficit. The elucidation of these mechanisms may help to understand the influence of ethylene on flowering in future works. In this way ,this study tested the hypothesis that rehydration causes a great increase in the ethylene production in the shoot and that water deficit affects the development of the vascular system in leaves of coffee trees. To test this hypothesis, analyzes of gene expression and anatomy were performed. In the gene expression analyzes, the expression levels of ethylene biosynthesis and signaling genes in well-wateredand water deficit plants, as well as after plant rehydration, were analyzed. In the anatomical analyzes, cross sections were made in young leaves of well-watered and water deficit plants. The gene expression analyzes suggest that plants under water deficit show a reductionin the production of ethylene in the shoot and an increase the synthesis of ACC in the root. In addition, it is suggested that rehydration causes a reduction of the ethylene production in the leaves, followed by an increase in their synthesis. Anatomical data indicate s that leaves from plants growing under water deficit have a larger number of xylem vessels and larger phloem area.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)A cafeicultura é historicamente uma atividade econômica de grande destaque no Brasil, sendo o país atualmente o maior produtor e exportador mundial de café. O cafeeiro apresenta floração do tipo gregária, ou seja, todas as plantas florescem ao mesmo tempo em uma determinada região, entretanto o número de floradas é variável, desde poucas como ocorre no Brasil até muitas como ocorre na Colômbia. O florescimento desuniforme provoca dificuldades relacionadas a colheitas parciais, controle doenças, controle de pragas, redução na qualidade dos grãos e aumento no custo de colheita. O florescimento do cafeeiro é dividido em três fases: iniciação ou diferenciação flora l, repouso ou quiescência e abertura floral, com a antese sendo desencadeada pela precipitação ou irrigação após um período de déficit hídrico. A resposta à reidratação tem sido associada a um aumento nos níveis de etileno. Este aumento pode estar envolvido no controle da promoção da antese do cafeeiro. Existem evidências de que este aumento pode estar relacionado ao transporte do precursor do etileno (ACC) da raiz para a parte aérea via sistema vascular. Entretanto, o efeito do déficit hídrico sobre a regulação do etileno e sobre o desenvolvimento do sistema vascular é pouco compreendido. Portanto, estudos neste sentido são fundamentais para compreender o mecanismo de regulação do etileno e do desenvolvimento do sistema vascular em plantas sob déficit hídr ico. A elucidação destes mecanismos pode auxiliar na compreensão da influência do etileno no florescimento em trabalhos futuros. Desta forma, este estudo testou a hipótese de que a reidratação provoca um aumento na produção de etileno na parte aérea e que o déficit hídrico afeta o desenvolvimento do sistema vascular em folhas do cafeeiro. Para testar esta hipótese foram feitas análises de expressão gênica e de anatomia. Nas análises de expressão foram analisados o nível de expressão dos genes de biossíntese e sinalização do etileno em mudas de café bem irrigadas e sob déficit hídrico, assim como após a reidratação. Nas análises anatômicas formam feitos cortes transversais em folhas jovens de plantas irrigadas e cultivadas sob estresse. As análises de expressão gênica sugerem que plantas sob déficit hídrico apresentam uma redução na produção de etileno na parte aérea e aumentam a síntese de ACC na raiz. Além disto, sugere que a reidratação provoca uma redução da produção de etileno nas folhas seguido de um aumento em sua síntese. Os dados de anatomia indicam que as folhas das plantas que crescem sob déficit hídrico apresentam maior número de vasos de xilema e maior área do floema.Universidade Federal de LavrasPrograma de Pós-Graduação em Agronomia/Fisiologia VegetalUFLAbrasilDepartamento de BiologiaChalfun Júnior, AntonioLima, André AlmeidaLima, André AlmeidaCosta Netto, Antônio Paulino daAvelar, Rafaella de Paula2018-05-07T12:17:48Z2018-05-07T12:17:48Z2018-05-042018-02-28info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfAVELAR, R. de P. Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico. 2018. 54 p. Dissertação (Mestrado em Fisiologia Vegetal)-Universidade Federal de Lavras, Lavras, 2018.http://repositorio.ufla.br/jspui/handle/1/29147porinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLA2023-04-26T21:36:38Zoai:localhost:1/29147Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2023-04-26T21:36:38Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
Ethylene regulation in coffee plants grown under different levels of water deficit
title Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
spellingShingle Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
Avelar, Rafaella de Paula
Café - Déficit hídrico
Cafeeiro - Florescimento
Cafeeiro - Etileno
Cafeeiro - Reidratação
Coffee - Water deficit
Coffee - Flowering
Coffee - Ethylene
Coffee - Rehydration
Fisiologia Vegetal
title_short Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
title_full Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
title_fullStr Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
title_full_unstemmed Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
title_sort Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico
author Avelar, Rafaella de Paula
author_facet Avelar, Rafaella de Paula
author_role author
dc.contributor.none.fl_str_mv Chalfun Júnior, Antonio
Lima, André Almeida
Lima, André Almeida
Costa Netto, Antônio Paulino da
dc.contributor.author.fl_str_mv Avelar, Rafaella de Paula
dc.subject.por.fl_str_mv Café - Déficit hídrico
Cafeeiro - Florescimento
Cafeeiro - Etileno
Cafeeiro - Reidratação
Coffee - Water deficit
Coffee - Flowering
Coffee - Ethylene
Coffee - Rehydration
Fisiologia Vegetal
topic Café - Déficit hídrico
Cafeeiro - Florescimento
Cafeeiro - Etileno
Cafeeiro - Reidratação
Coffee - Water deficit
Coffee - Flowering
Coffee - Ethylene
Coffee - Rehydration
Fisiologia Vegetal
description Coffee cultivation has historically been a major economic activity in Brazil, and Brazil is currently the world's largest producer and exporter of coffee. Coffee trees show flowering of the gregarious type, that is, all plants bloom at the same time in a c ertain region, however, the number of flowering events is variable, from few events like it occurs in Brazil, to many events as it occurs in Colombia. Asynchronous flowering causes difficulties related to partial harvesting, disease control, pest control, reduction in grain quality, and increases harvesting costs. Coffee flowering is divided into three stages: floral initiation or differentiation, rest or quiescence, and floral opening, or anthesis, being triggered by precipitation or irrigation after a period of water deficit. The response to rehydration has been associated with an increase in ethylene levels. This increase may be involved in the control of coffee anthesis promotion.There is evidence that this increase may be related to the transport of the ethylene precursor (ACC) from the roots to the shoot via the vascular system. However, the effect of water deficit on the regulation of ethylene and on vascular system development is poorly understood. T herefore, studies in this sense are fundamental to understand the mechanism of ethylene regulationand the development of the vascular system in plants under water deficit. The elucidation of these mechanisms may help to understand the influence of ethylene on flowering in future works. In this way ,this study tested the hypothesis that rehydration causes a great increase in the ethylene production in the shoot and that water deficit affects the development of the vascular system in leaves of coffee trees. To test this hypothesis, analyzes of gene expression and anatomy were performed. In the gene expression analyzes, the expression levels of ethylene biosynthesis and signaling genes in well-wateredand water deficit plants, as well as after plant rehydration, were analyzed. In the anatomical analyzes, cross sections were made in young leaves of well-watered and water deficit plants. The gene expression analyzes suggest that plants under water deficit show a reductionin the production of ethylene in the shoot and an increase the synthesis of ACC in the root. In addition, it is suggested that rehydration causes a reduction of the ethylene production in the leaves, followed by an increase in their synthesis. Anatomical data indicate s that leaves from plants growing under water deficit have a larger number of xylem vessels and larger phloem area.
publishDate 2018
dc.date.none.fl_str_mv 2018-05-07T12:17:48Z
2018-05-07T12:17:48Z
2018-05-04
2018-02-28
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv AVELAR, R. de P. Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico. 2018. 54 p. Dissertação (Mestrado em Fisiologia Vegetal)-Universidade Federal de Lavras, Lavras, 2018.
http://repositorio.ufla.br/jspui/handle/1/29147
identifier_str_mv AVELAR, R. de P. Regulação do etileno em cafeeiros cultivados sob diferentes níveis de déficit hídrico. 2018. 54 p. Dissertação (Mestrado em Fisiologia Vegetal)-Universidade Federal de Lavras, Lavras, 2018.
url http://repositorio.ufla.br/jspui/handle/1/29147
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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
Programa de Pós-Graduação em Agronomia/Fisiologia Vegetal
UFLA
brasil
Departamento de Biologia
publisher.none.fl_str_mv Universidade Federal de Lavras
Programa de Pós-Graduação em Agronomia/Fisiologia Vegetal
UFLA
brasil
Departamento de Biologia
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
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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)
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