Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales)
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s00709-020-01583-0 http://hdl.handle.net/11449/205430 |
Resumo: | Juncaceae, a cosmopolitan family, belong to the cyperid clade of Poales together with Cyperaceae and Thurniaceae. Pollen grain of Juncaceae, as in Thurniaceae, is dispersed in a permanent tetrad, and knowledge about the ontogeny of its wall is still incipient, based on data from only one species. This study aims to analyze the formation of the pollen wall of seven Juncus species in order to characterize the timing and the ontogenetic events that lead to the cohesion of the four pollen grains in a permanent tetrad. Anthers at different developmental stages were submitted to techniques of light microscopy and transmission electron microscopy; dehiscent anthers with mature pollens were also analyzed in scanning electron microscopy. In all the species here studied, callose deposits around each microsporocyte, with dissolution prior to meiosis. Microspore wall starts at the end of the second meiotic division with formation of primexine. Exine comprises tectum, columellae, and foot layer. During cytokinesis, cell plates form the internal wall of the pollen tetrad. Mature permanent tetrad is enveloped externally by both the exine and intine and internally by the intine and the foot layer, which forms the continuous internal wall. Callose was detected in the early stages of microsporocytes, although reported to be absent in Juncaceae. Our data confirm the variation in Juncaceae cytokinesis and the occurrence of simple cohesion due to the presence of a continuous tectum along the pollen tetrad. |
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Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales)CalloseCyperidsExineIntinePrimexineJuncaceae, a cosmopolitan family, belong to the cyperid clade of Poales together with Cyperaceae and Thurniaceae. Pollen grain of Juncaceae, as in Thurniaceae, is dispersed in a permanent tetrad, and knowledge about the ontogeny of its wall is still incipient, based on data from only one species. This study aims to analyze the formation of the pollen wall of seven Juncus species in order to characterize the timing and the ontogenetic events that lead to the cohesion of the four pollen grains in a permanent tetrad. Anthers at different developmental stages were submitted to techniques of light microscopy and transmission electron microscopy; dehiscent anthers with mature pollens were also analyzed in scanning electron microscopy. In all the species here studied, callose deposits around each microsporocyte, with dissolution prior to meiosis. Microspore wall starts at the end of the second meiotic division with formation of primexine. Exine comprises tectum, columellae, and foot layer. During cytokinesis, cell plates form the internal wall of the pollen tetrad. Mature permanent tetrad is enveloped externally by both the exine and intine and internally by the intine and the foot layer, which forms the continuous internal wall. Callose was detected in the early stages of microsporocytes, although reported to be absent in Juncaceae. Our data confirm the variation in Juncaceae cytokinesis and the occurrence of simple cohesion due to the presence of a continuous tectum along the pollen tetrad.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Programa de Pós-Graduação em Ciências Biológicas (Biologia Vegetal) Universidade Estadual Paulista “Júlio de Mesquita Filho” (Unesp) Instituto de BiociênciasDepartamento de Biodiversidade Universidade Estadual Paulista “Júlio de Mesquita Filho” (Unesp) Instituto de BiociênciasPrograma de Pós-Graduação em Ciências Biológicas (Biologia Vegetal) Universidade Estadual Paulista “Júlio de Mesquita Filho” (Unesp) Instituto de BiociênciasDepartamento de Biodiversidade Universidade Estadual Paulista “Júlio de Mesquita Filho” (Unesp) Instituto de BiociênciasCNPq: 141848/2017-0 - Ph.D. ScholarshipCNPq: 307515/2015-0CNPq: 309504/2018-0 - Research GrantsCAPES: CAPES/PNPD - Finance Code 001Universidade Estadual Paulista (Unesp)Passarini Lopes, Fernanda [UNESP]Oriani, Aline [UNESP]Coan, Alessandra Ike [UNESP]2021-06-25T10:15:11Z2021-06-25T10:15:11Z2021-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article495-506http://dx.doi.org/10.1007/s00709-020-01583-0Protoplasma, v. 258, n. 3, p. 495-506, 2021.1615-61020033-183Xhttp://hdl.handle.net/11449/20543010.1007/s00709-020-01583-02-s2.0-85095427031Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengProtoplasmainfo:eu-repo/semantics/openAccess2021-10-23T14:26:39Zoai:repositorio.unesp.br:11449/205430Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:50:24.476398Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
title |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
spellingShingle |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) Passarini Lopes, Fernanda [UNESP] Callose Cyperids Exine Intine Primexine |
title_short |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
title_full |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
title_fullStr |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
title_full_unstemmed |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
title_sort |
Development of the permanent tetrad wall in Juncus L. (Juncaceae, Poales) |
author |
Passarini Lopes, Fernanda [UNESP] |
author_facet |
Passarini Lopes, Fernanda [UNESP] Oriani, Aline [UNESP] Coan, Alessandra Ike [UNESP] |
author_role |
author |
author2 |
Oriani, Aline [UNESP] Coan, Alessandra Ike [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Passarini Lopes, Fernanda [UNESP] Oriani, Aline [UNESP] Coan, Alessandra Ike [UNESP] |
dc.subject.por.fl_str_mv |
Callose Cyperids Exine Intine Primexine |
topic |
Callose Cyperids Exine Intine Primexine |
description |
Juncaceae, a cosmopolitan family, belong to the cyperid clade of Poales together with Cyperaceae and Thurniaceae. Pollen grain of Juncaceae, as in Thurniaceae, is dispersed in a permanent tetrad, and knowledge about the ontogeny of its wall is still incipient, based on data from only one species. This study aims to analyze the formation of the pollen wall of seven Juncus species in order to characterize the timing and the ontogenetic events that lead to the cohesion of the four pollen grains in a permanent tetrad. Anthers at different developmental stages were submitted to techniques of light microscopy and transmission electron microscopy; dehiscent anthers with mature pollens were also analyzed in scanning electron microscopy. In all the species here studied, callose deposits around each microsporocyte, with dissolution prior to meiosis. Microspore wall starts at the end of the second meiotic division with formation of primexine. Exine comprises tectum, columellae, and foot layer. During cytokinesis, cell plates form the internal wall of the pollen tetrad. Mature permanent tetrad is enveloped externally by both the exine and intine and internally by the intine and the foot layer, which forms the continuous internal wall. Callose was detected in the early stages of microsporocytes, although reported to be absent in Juncaceae. Our data confirm the variation in Juncaceae cytokinesis and the occurrence of simple cohesion due to the presence of a continuous tectum along the pollen tetrad. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-06-25T10:15:11Z 2021-06-25T10:15:11Z 2021-05-01 |
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/10.1007/s00709-020-01583-0 Protoplasma, v. 258, n. 3, p. 495-506, 2021. 1615-6102 0033-183X http://hdl.handle.net/11449/205430 10.1007/s00709-020-01583-0 2-s2.0-85095427031 |
url |
http://dx.doi.org/10.1007/s00709-020-01583-0 http://hdl.handle.net/11449/205430 |
identifier_str_mv |
Protoplasma, v. 258, n. 3, p. 495-506, 2021. 1615-6102 0033-183X 10.1007/s00709-020-01583-0 2-s2.0-85095427031 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Protoplasma |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
495-506 |
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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1808129126458982400 |