Leaf area Index and yield of upland rice. II. Manifestation through yield components

Detalhes bibliográficos
Autor(a) principal: Pinheiro, Beatriz da Silveira
Data de Publicação: 2014
Outros Autores: Martins, José Francisco da Silva, Zimmermann, Francisco José P.
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/13518
Resumo: - The relationship between leaf area index (LAI) and yield, through its components, was studied in the upland rice cultivar, IAC 47, in two field experiments with different planting dates. Rains were abundant and well distributed during the reproductive stage of the first experiment (EXP I), whereas were scarce for the second one (EXP II), resulting in water stress to the plants. In order to achieve variation in LAI, five defoliation levels (O, 25, 50, 75 and 100%) were performed at the stage of spikelet differentiation. Before cutting, LAI was 6,5 for EXP I, and 5,5 for EXP II. An additional treatment was tested in EXP II, in which 50% of the leaf area was removed through detillering. Covariance analysis showed that LAI effect on yield was exerted through spikelet number in EXP I, and through spikelet fertility in EXP II. Comparison of the detillering treatment with the standard 50% defoliation showed that the number of tillers can be increased without decrease in drought resistance if leaf area per tiller is reduced
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spelling Leaf area Index and yield of upland rice. II. Manifestation through yield componentsíndice de área foliar e produtividade do arroz de sequeiro. II. Manifestação através dos componentes da produção.Oryza sativa; drought resistance; riceOryza sativa; resistência à seca; arroz.- The relationship between leaf area index (LAI) and yield, through its components, was studied in the upland rice cultivar, IAC 47, in two field experiments with different planting dates. Rains were abundant and well distributed during the reproductive stage of the first experiment (EXP I), whereas were scarce for the second one (EXP II), resulting in water stress to the plants. In order to achieve variation in LAI, five defoliation levels (O, 25, 50, 75 and 100%) were performed at the stage of spikelet differentiation. Before cutting, LAI was 6,5 for EXP I, and 5,5 for EXP II. An additional treatment was tested in EXP II, in which 50% of the leaf area was removed through detillering. Covariance analysis showed that LAI effect on yield was exerted through spikelet number in EXP I, and through spikelet fertility in EXP II. Comparison of the detillering treatment with the standard 50% defoliation showed that the number of tillers can be increased without decrease in drought resistance if leaf area per tiller is reducedA relação entre o índice de área foliar (IAF e a produtividade, manifesta através dos componentes, foi estudada na cultivar de arroz de sequeiro IAC 47, em dois experimentos de campo, com distintas épocas de plantio. As chuvas foram abundantes e bem distribuídas durante o período reprodutivo da 1ª época, enquanto escassas para a 2ª, ocasionando deficiência hídrica. Variação no IAF foi obtida através de cinco níveis de desfolhamento (0, 25, 50, 75 e 100%) praticados no estágio de diferenciação das espiguetas, a partir de IAF em torno de 6,5 e 5,5 para a 1 e 25 épocas, respectivamente. Foi testado um tratamento adicional na 2ª época, em que 50% de desfolhamento foi obtido pela eliminação de perfilhos. A análise de covariância indicou que o efeito do IAF se deu através do número de espiguetas na 1ª época, e da fertilidade de espiguetas, na 2ª. A comparação do tratamento adicional com o padrão para 50% de desfolhamento, indicou que o número de perfilhos pode ser aumentado sem decréscimo da resistência à seca, desde que a área foliar por perfilho seja reduzida.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraPinheiro, Beatriz da SilveiraMartins, José Francisco da SilvaZimmermann, Francisco José P.2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/13518Pesquisa Agropecuaria Brasileira; v.25, n.6, jun. 1990; 873-879Pesquisa Agropecuária Brasileira; v.25, n.6, jun. 1990; 873-8791678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/13518/7676info:eu-repo/semantics/openAccess2014-04-17T14:34:39Zoai:ojs.seer.sct.embrapa.br:article/13518Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-17T14:34:39Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Leaf area Index and yield of upland rice. II. Manifestation through yield components
índice de área foliar e produtividade do arroz de sequeiro. II. Manifestação através dos componentes da produção.
title Leaf area Index and yield of upland rice. II. Manifestation through yield components
spellingShingle Leaf area Index and yield of upland rice. II. Manifestation through yield components
Pinheiro, Beatriz da Silveira
Oryza sativa; drought resistance; rice
Oryza sativa; resistência à seca; arroz.
title_short Leaf area Index and yield of upland rice. II. Manifestation through yield components
title_full Leaf area Index and yield of upland rice. II. Manifestation through yield components
title_fullStr Leaf area Index and yield of upland rice. II. Manifestation through yield components
title_full_unstemmed Leaf area Index and yield of upland rice. II. Manifestation through yield components
title_sort Leaf area Index and yield of upland rice. II. Manifestation through yield components
author Pinheiro, Beatriz da Silveira
author_facet Pinheiro, Beatriz da Silveira
Martins, José Francisco da Silva
Zimmermann, Francisco José P.
author_role author
author2 Martins, José Francisco da Silva
Zimmermann, Francisco José P.
author2_role author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Pinheiro, Beatriz da Silveira
Martins, José Francisco da Silva
Zimmermann, Francisco José P.
dc.subject.por.fl_str_mv Oryza sativa; drought resistance; rice
Oryza sativa; resistência à seca; arroz.
topic Oryza sativa; drought resistance; rice
Oryza sativa; resistência à seca; arroz.
description - The relationship between leaf area index (LAI) and yield, through its components, was studied in the upland rice cultivar, IAC 47, in two field experiments with different planting dates. Rains were abundant and well distributed during the reproductive stage of the first experiment (EXP I), whereas were scarce for the second one (EXP II), resulting in water stress to the plants. In order to achieve variation in LAI, five defoliation levels (O, 25, 50, 75 and 100%) were performed at the stage of spikelet differentiation. Before cutting, LAI was 6,5 for EXP I, and 5,5 for EXP II. An additional treatment was tested in EXP II, in which 50% of the leaf area was removed through detillering. Covariance analysis showed that LAI effect on yield was exerted through spikelet number in EXP I, and through spikelet fertility in EXP II. Comparison of the detillering treatment with the standard 50% defoliation showed that the number of tillers can be increased without decrease in drought resistance if leaf area per tiller is reduced
publishDate 2014
dc.date.none.fl_str_mv 2014-04-17
dc.type.none.fl_str_mv
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://seer.sct.embrapa.br/index.php/pab/article/view/13518
url https://seer.sct.embrapa.br/index.php/pab/article/view/13518
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/13518/7676
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 Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.25, n.6, jun. 1990; 873-879
Pesquisa Agropecuária Brasileira; v.25, n.6, jun. 1990; 873-879
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Pesquisa Agropecuária Brasileira (Online)
collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv pab@sct.embrapa.br || sct.pab@embrapa.br
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