Germination constraints of dicarpic cypselae of Bidens pilosa L.

Detalhes bibliográficos
Autor(a) principal: Souza-Filho, P. R.M.
Data de Publicação: 2019
Outros Autores: Takaki, M. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/1519-6984.178222
http://hdl.handle.net/11449/187594
Resumo: Bidens pilosa L. is a heterocarpic weed species with two cypselae types that present morpho-physiological differences, being the peripheral type smaller and slower to germinate than the central one. We aimed to verify how the germination mechanism varied between types. We focused on two mechanisms: (1) pericarp constraints (physical and chemical) and (2) hormonal stimulation (Abcisic acid [ABA] and Gibberellin [GA]). Both cypselae types are physically constrained by the pericarp, for when it is excised both seed types increase their germination, but behavioral differences still remain. The pericarp of the peripheral type also has chemical inhibitors that effectively inhibited germination of the intact central cypsela. To test the hormonal effects, we focused on the ABA:GA control. Both cypselae responded to an exogenous ABA concentration gradient, however there is no variation between types on the sensitivity to it. Also, both cypselae types were indifferent to Fluridone (ABA inhibitor), which indicates that the dormancy is not maintained by de novo ABA synthesis. Cypselae types had different sensitivity to an exogenous GA3 gradient, the central type being more sensitive to the treatment than the peripheral one. But when the endogenous GA synthesis was blocked by Paclobutrazol, both types responded equally to same GA3 concentrations. This indicates that endogenous GA synthesis may be related to differences observed on germination of cypselae types. To conclude, seed types differ on their growth potential to overcome the pericarp resistance: while the inhibitor in the peripheral pericarp reduces growth potential, GA increases it.
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spelling Germination constraints of dicarpic cypselae of Bidens pilosa L.Restrições a germinação de cipselas dicárpicas de Bidens pilosa L.Heteromophic diasporesHormonal controllingPericarp inhibitionBidens pilosa L. is a heterocarpic weed species with two cypselae types that present morpho-physiological differences, being the peripheral type smaller and slower to germinate than the central one. We aimed to verify how the germination mechanism varied between types. We focused on two mechanisms: (1) pericarp constraints (physical and chemical) and (2) hormonal stimulation (Abcisic acid [ABA] and Gibberellin [GA]). Both cypselae types are physically constrained by the pericarp, for when it is excised both seed types increase their germination, but behavioral differences still remain. The pericarp of the peripheral type also has chemical inhibitors that effectively inhibited germination of the intact central cypsela. To test the hormonal effects, we focused on the ABA:GA control. Both cypselae responded to an exogenous ABA concentration gradient, however there is no variation between types on the sensitivity to it. Also, both cypselae types were indifferent to Fluridone (ABA inhibitor), which indicates that the dormancy is not maintained by de novo ABA synthesis. Cypselae types had different sensitivity to an exogenous GA3 gradient, the central type being more sensitive to the treatment than the peripheral one. But when the endogenous GA synthesis was blocked by Paclobutrazol, both types responded equally to same GA3 concentrations. This indicates that endogenous GA synthesis may be related to differences observed on germination of cypselae types. To conclude, seed types differ on their growth potential to overcome the pericarp resistance: while the inhibitor in the peripheral pericarp reduces growth potential, GA increases it.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Centro Multidisciplinar da Barra Universidade Federal do Oeste da Bahia – UFOB, Avenida 23 de Agosto, s/nLaboratório de Fotomorfogênese de Plantas Departamento de Botânica Instituto de Biociências Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Avenida 24-A, 1515Laboratório de Fotomorfogênese de Plantas Departamento de Botânica Instituto de Biociências Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Avenida 24-A, 1515CNPq: 147810/2010-8Universidade Federal do Oeste da Bahia – UFOBUniversidade Estadual Paulista (Unesp)Souza-Filho, P. R.M.Takaki, M. [UNESP]2019-10-06T15:41:17Z2019-10-06T15:41:17Z2019-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article383-394application/pdfhttp://dx.doi.org/10.1590/1519-6984.178222Brazilian Journal of Biology, v. 79, n. 3, p. 383-394, 2019.1678-43751519-6984http://hdl.handle.net/11449/18759410.1590/1519-6984.178222S1519-698420190003003832-s2.0-85064722620S1519-69842019000300383.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBrazilian Journal of Biologyinfo:eu-repo/semantics/openAccess2023-11-02T06:07:06Zoai:repositorio.unesp.br:11449/187594Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-02T06:07:06Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Germination constraints of dicarpic cypselae of Bidens pilosa L.
Restrições a germinação de cipselas dicárpicas de Bidens pilosa L.
title Germination constraints of dicarpic cypselae of Bidens pilosa L.
spellingShingle Germination constraints of dicarpic cypselae of Bidens pilosa L.
Souza-Filho, P. R.M.
Heteromophic diaspores
Hormonal controlling
Pericarp inhibition
title_short Germination constraints of dicarpic cypselae of Bidens pilosa L.
title_full Germination constraints of dicarpic cypselae of Bidens pilosa L.
title_fullStr Germination constraints of dicarpic cypselae of Bidens pilosa L.
title_full_unstemmed Germination constraints of dicarpic cypselae of Bidens pilosa L.
title_sort Germination constraints of dicarpic cypselae of Bidens pilosa L.
author Souza-Filho, P. R.M.
author_facet Souza-Filho, P. R.M.
Takaki, M. [UNESP]
author_role author
author2 Takaki, M. [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade Federal do Oeste da Bahia – UFOB
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Souza-Filho, P. R.M.
Takaki, M. [UNESP]
dc.subject.por.fl_str_mv Heteromophic diaspores
Hormonal controlling
Pericarp inhibition
topic Heteromophic diaspores
Hormonal controlling
Pericarp inhibition
description Bidens pilosa L. is a heterocarpic weed species with two cypselae types that present morpho-physiological differences, being the peripheral type smaller and slower to germinate than the central one. We aimed to verify how the germination mechanism varied between types. We focused on two mechanisms: (1) pericarp constraints (physical and chemical) and (2) hormonal stimulation (Abcisic acid [ABA] and Gibberellin [GA]). Both cypselae types are physically constrained by the pericarp, for when it is excised both seed types increase their germination, but behavioral differences still remain. The pericarp of the peripheral type also has chemical inhibitors that effectively inhibited germination of the intact central cypsela. To test the hormonal effects, we focused on the ABA:GA control. Both cypselae responded to an exogenous ABA concentration gradient, however there is no variation between types on the sensitivity to it. Also, both cypselae types were indifferent to Fluridone (ABA inhibitor), which indicates that the dormancy is not maintained by de novo ABA synthesis. Cypselae types had different sensitivity to an exogenous GA3 gradient, the central type being more sensitive to the treatment than the peripheral one. But when the endogenous GA synthesis was blocked by Paclobutrazol, both types responded equally to same GA3 concentrations. This indicates that endogenous GA synthesis may be related to differences observed on germination of cypselae types. To conclude, seed types differ on their growth potential to overcome the pericarp resistance: while the inhibitor in the peripheral pericarp reduces growth potential, GA increases it.
publishDate 2019
dc.date.none.fl_str_mv 2019-10-06T15:41:17Z
2019-10-06T15:41:17Z
2019-01-01
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/10.1590/1519-6984.178222
Brazilian Journal of Biology, v. 79, n. 3, p. 383-394, 2019.
1678-4375
1519-6984
http://hdl.handle.net/11449/187594
10.1590/1519-6984.178222
S1519-69842019000300383
2-s2.0-85064722620
S1519-69842019000300383.pdf
url http://dx.doi.org/10.1590/1519-6984.178222
http://hdl.handle.net/11449/187594
identifier_str_mv Brazilian Journal of Biology, v. 79, n. 3, p. 383-394, 2019.
1678-4375
1519-6984
10.1590/1519-6984.178222
S1519-69842019000300383
2-s2.0-85064722620
S1519-69842019000300383.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Brazilian Journal of Biology
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 383-394
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
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