Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/1519-6984.15714 http://hdl.handle.net/11449/168424 |
Resumo: | This paper analyzed the thermal dependence on the germination of Urochloa brizantha (Stapf) Webster seeds under constant and fluctuating temperatures through the thermal time model. Germination tests were carried out at constant temperatures ranging from 8 °C to 41.5 °C in order to determine the model parameters: base (Tb), optimal (To) and maximum temperature (Tc) for germination; and the thermal time (θT) required for individual seeds to germinate. Braquiarao seeds germinate within a temperature interval from 8 °C to 41.5 °C, with an optimum range for germination estimated at 31.5 ° ≤ T ≤ 34.5 °C. Actual and expected distributions of cumulative germination percentages of U. brizantha seeds put to germinate both under controlled and uncontrolled temperature regimes were compared, and it can be seen that the model described relatively well the germination at isothermal assays; however the model failed to predict germination at a wide range of thermal fluctuations. Possible explanations for the results are discussed. |
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Repositório Institucional da UNESP |
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Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmicoAnalysis of thermal dependence on the germination of braquiarão seeds using the thermal time modelDegrees-dayTemperatureUrochloa brizanthaThis paper analyzed the thermal dependence on the germination of Urochloa brizantha (Stapf) Webster seeds under constant and fluctuating temperatures through the thermal time model. Germination tests were carried out at constant temperatures ranging from 8 °C to 41.5 °C in order to determine the model parameters: base (Tb), optimal (To) and maximum temperature (Tc) for germination; and the thermal time (θT) required for individual seeds to germinate. Braquiarao seeds germinate within a temperature interval from 8 °C to 41.5 °C, with an optimum range for germination estimated at 31.5 ° ≤ T ≤ 34.5 °C. Actual and expected distributions of cumulative germination percentages of U. brizantha seeds put to germinate both under controlled and uncontrolled temperature regimes were compared, and it can be seen that the model described relatively well the germination at isothermal assays; however the model failed to predict germination at a wide range of thermal fluctuations. Possible explanations for the results are discussed.Grupo de Ecofisiologia de Sementes Laboratório de Fisiologia Vegetal Departamento de Botânica Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP, Avenida 24A, 1515Grupo de Ecofisiologia de Sementes Laboratório de Fisiologia Vegetal Departamento de Botânica Universidade Estadual Paulista “Júlio de Mesquita Filho” - UNESP, Avenida 24A, 1515Universidade Estadual Paulista (Unesp)Nakao, E. A. [UNESP]Cardoso, V. J.M. [UNESP]2018-12-11T16:41:13Z2018-12-11T16:41:13Z2016-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article162-168application/pdfhttp://dx.doi.org/10.1590/1519-6984.15714Brazilian Journal of Biology, v. 76, n. 1, p. 162-168, 2016.1678-43751519-6984http://hdl.handle.net/11449/16842410.1590/1519-6984.15714S1519-698420160001001622-s2.0-84959244834S1519-69842016000100162.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Biology0,523info:eu-repo/semantics/openAccess2023-12-29T06:20:08Zoai:repositorio.unesp.br:11449/168424Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:36:18.095760Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico Analysis of thermal dependence on the germination of braquiarão seeds using the thermal time model |
title |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico |
spellingShingle |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico Nakao, E. A. [UNESP] Degrees-day Temperature Urochloa brizantha |
title_short |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico |
title_full |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico |
title_fullStr |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico |
title_full_unstemmed |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico |
title_sort |
Análise da dependência térmica da germinação de braquiarão utilizando o modelo tempo térmico |
author |
Nakao, E. A. [UNESP] |
author_facet |
Nakao, E. A. [UNESP] Cardoso, V. J.M. [UNESP] |
author_role |
author |
author2 |
Cardoso, V. J.M. [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Nakao, E. A. [UNESP] Cardoso, V. J.M. [UNESP] |
dc.subject.por.fl_str_mv |
Degrees-day Temperature Urochloa brizantha |
topic |
Degrees-day Temperature Urochloa brizantha |
description |
This paper analyzed the thermal dependence on the germination of Urochloa brizantha (Stapf) Webster seeds under constant and fluctuating temperatures through the thermal time model. Germination tests were carried out at constant temperatures ranging from 8 °C to 41.5 °C in order to determine the model parameters: base (Tb), optimal (To) and maximum temperature (Tc) for germination; and the thermal time (θT) required for individual seeds to germinate. Braquiarao seeds germinate within a temperature interval from 8 °C to 41.5 °C, with an optimum range for germination estimated at 31.5 ° ≤ T ≤ 34.5 °C. Actual and expected distributions of cumulative germination percentages of U. brizantha seeds put to germinate both under controlled and uncontrolled temperature regimes were compared, and it can be seen that the model described relatively well the germination at isothermal assays; however the model failed to predict germination at a wide range of thermal fluctuations. Possible explanations for the results are discussed. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-02-01 2018-12-11T16:41:13Z 2018-12-11T16:41:13Z |
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 |
http://dx.doi.org/10.1590/1519-6984.15714 Brazilian Journal of Biology, v. 76, n. 1, p. 162-168, 2016. 1678-4375 1519-6984 http://hdl.handle.net/11449/168424 10.1590/1519-6984.15714 S1519-69842016000100162 2-s2.0-84959244834 S1519-69842016000100162.pdf |
url |
http://dx.doi.org/10.1590/1519-6984.15714 http://hdl.handle.net/11449/168424 |
identifier_str_mv |
Brazilian Journal of Biology, v. 76, n. 1, p. 162-168, 2016. 1678-4375 1519-6984 10.1590/1519-6984.15714 S1519-69842016000100162 2-s2.0-84959244834 S1519-69842016000100162.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Brazilian Journal of Biology 0,523 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
162-168 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129340785819648 |