COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE)
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/10.1086/686794 http://hdl.handle.net/11449/161622 |
Resumo: | Premise of research. Recent phylogenetic studies placed nearly all Neotropical arboreal and shrubby species of the Bignoniaceae (excluding Jacaranda) in the Tabebuia alliance, a clade that includes all of the woody species in this family with palmately compound leaves. However, the taxa assigned to this clade have appeared in these studies as an unresolved trichotomy with Sparattosperma as its sister group. Considering the diversity and taxonomic significance of ovule morphogenesis in the extant angiosperms, this study aimed to contribute to the systematics of the Bignoniaceae by investigating ovule ontogeny in one representative of each clade of the Tabebuia alliance trichotomy: Crescentia cujete, Cybistax antisyphilitica, and Tabebuia roseoalba. Methodology. The analysis is based on light microscopy observations of microtome semiserial sections of ovaries and ovules at several stages of development. Pivotal results. The ovules are anatropous, unitegmic, and tenuinucellate and originate from trizonate ovule primordia. The single integument shows a concurrent epidermal and subepidermal origin, and a dark staining hypostase develops at the chalaza. Meiosis of the megaspore mother cell results in a linear or T-shaped tetrad of megaspores. The chalazal megaspore generates a monosporic Polygonum-type female gametophyte. In comparison to previous studies, our analysis of ontogenetic events demonstrates that embryological features are highly conserved in the Bignoniaceae. However, some peculiar characteristics are congruent with the systematic consideration of this study, especially the pattern of callose wall deposition during megasporogenesis and the occurrence of a protruding versus nonprotruding nucellus during early ovule development. Conclusions. In the context of other embryological studies of the Bignoniaceae, our results support closer phylogenetic relationships among Crescentia, Handroanthus, and Tabebuia in comparison to Cybistax and indicate that the nonprotruding early nucellus is an additional character state that helps to segregate Tabebuia s.s. from other taxa in the Tabebuia alliance with a eusyncarpous ovary. |
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COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE)megasporogenesismegagametogenesisovule developmentcallosenucellusembryo sacPremise of research. Recent phylogenetic studies placed nearly all Neotropical arboreal and shrubby species of the Bignoniaceae (excluding Jacaranda) in the Tabebuia alliance, a clade that includes all of the woody species in this family with palmately compound leaves. However, the taxa assigned to this clade have appeared in these studies as an unresolved trichotomy with Sparattosperma as its sister group. Considering the diversity and taxonomic significance of ovule morphogenesis in the extant angiosperms, this study aimed to contribute to the systematics of the Bignoniaceae by investigating ovule ontogeny in one representative of each clade of the Tabebuia alliance trichotomy: Crescentia cujete, Cybistax antisyphilitica, and Tabebuia roseoalba. Methodology. The analysis is based on light microscopy observations of microtome semiserial sections of ovaries and ovules at several stages of development. Pivotal results. The ovules are anatropous, unitegmic, and tenuinucellate and originate from trizonate ovule primordia. The single integument shows a concurrent epidermal and subepidermal origin, and a dark staining hypostase develops at the chalaza. Meiosis of the megaspore mother cell results in a linear or T-shaped tetrad of megaspores. The chalazal megaspore generates a monosporic Polygonum-type female gametophyte. In comparison to previous studies, our analysis of ontogenetic events demonstrates that embryological features are highly conserved in the Bignoniaceae. However, some peculiar characteristics are congruent with the systematic consideration of this study, especially the pattern of callose wall deposition during megasporogenesis and the occurrence of a protruding versus nonprotruding nucellus during early ovule development. Conclusions. In the context of other embryological studies of the Bignoniaceae, our results support closer phylogenetic relationships among Crescentia, Handroanthus, and Tabebuia in comparison to Cybistax and indicate that the nonprotruding early nucellus is an additional character state that helps to segregate Tabebuia s.s. from other taxa in the Tabebuia alliance with a eusyncarpous ovary.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Univ Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, Dept Zool & Bot, Rua Cristovao Colombo 2265, BR-15054000 Sao Paulo, BrazilUniv Estadual Paulista, Inst Biociencias Botucatu, Programa Posgrad Ciencias Biol Bot, BR-18618970 Sao Paulo, BrazilUniv Estadual Paulista, Inst Biociencias Letras & Ciencias Exatas, Dept Zool & Bot, Rua Cristovao Colombo 2265, BR-15054000 Sao Paulo, BrazilUniv Estadual Paulista, Inst Biociencias Botucatu, Programa Posgrad Ciencias Biol Bot, BR-18618970 Sao Paulo, BrazilUniv Chicago PressUniversidade Estadual Paulista (Unesp)Pereira, Eduardo Joao [UNESP]Bittencourt, Nelson Sabino [UNESP]2018-11-26T16:40:42Z2018-11-26T16:40:42Z2016-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article481-497application/pdfhttp://dx.doi.org/10.1086/686794International Journal Of Plant Sciences. Chicago: Univ Chicago Press, v. 177, n. 6, p. 481-497, 2016.1058-5893http://hdl.handle.net/11449/16162210.1086/686794WOS:000378090400002WOS000378090400002.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengInternational Journal Of Plant Sciences0,798info:eu-repo/semantics/openAccess2024-01-24T06:33:43Zoai:repositorio.unesp.br:11449/161622Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:51:28.849315Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
title |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
spellingShingle |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) Pereira, Eduardo Joao [UNESP] megasporogenesis megagametogenesis ovule development callose nucellus embryo sac |
title_short |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
title_full |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
title_fullStr |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
title_full_unstemmed |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
title_sort |
COMPARATIVE OVULE ONTOGENY IN SOME MEMBERS OF THE TABEBUIA ALLIANCE (BIGNONIACEAE) |
author |
Pereira, Eduardo Joao [UNESP] |
author_facet |
Pereira, Eduardo Joao [UNESP] Bittencourt, Nelson Sabino [UNESP] |
author_role |
author |
author2 |
Bittencourt, Nelson Sabino [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Pereira, Eduardo Joao [UNESP] Bittencourt, Nelson Sabino [UNESP] |
dc.subject.por.fl_str_mv |
megasporogenesis megagametogenesis ovule development callose nucellus embryo sac |
topic |
megasporogenesis megagametogenesis ovule development callose nucellus embryo sac |
description |
Premise of research. Recent phylogenetic studies placed nearly all Neotropical arboreal and shrubby species of the Bignoniaceae (excluding Jacaranda) in the Tabebuia alliance, a clade that includes all of the woody species in this family with palmately compound leaves. However, the taxa assigned to this clade have appeared in these studies as an unresolved trichotomy with Sparattosperma as its sister group. Considering the diversity and taxonomic significance of ovule morphogenesis in the extant angiosperms, this study aimed to contribute to the systematics of the Bignoniaceae by investigating ovule ontogeny in one representative of each clade of the Tabebuia alliance trichotomy: Crescentia cujete, Cybistax antisyphilitica, and Tabebuia roseoalba. Methodology. The analysis is based on light microscopy observations of microtome semiserial sections of ovaries and ovules at several stages of development. Pivotal results. The ovules are anatropous, unitegmic, and tenuinucellate and originate from trizonate ovule primordia. The single integument shows a concurrent epidermal and subepidermal origin, and a dark staining hypostase develops at the chalaza. Meiosis of the megaspore mother cell results in a linear or T-shaped tetrad of megaspores. The chalazal megaspore generates a monosporic Polygonum-type female gametophyte. In comparison to previous studies, our analysis of ontogenetic events demonstrates that embryological features are highly conserved in the Bignoniaceae. However, some peculiar characteristics are congruent with the systematic consideration of this study, especially the pattern of callose wall deposition during megasporogenesis and the occurrence of a protruding versus nonprotruding nucellus during early ovule development. Conclusions. In the context of other embryological studies of the Bignoniaceae, our results support closer phylogenetic relationships among Crescentia, Handroanthus, and Tabebuia in comparison to Cybistax and indicate that the nonprotruding early nucellus is an additional character state that helps to segregate Tabebuia s.s. from other taxa in the Tabebuia alliance with a eusyncarpous ovary. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-07-01 2018-11-26T16:40:42Z 2018-11-26T16:40:42Z |
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/10.1086/686794 International Journal Of Plant Sciences. Chicago: Univ Chicago Press, v. 177, n. 6, p. 481-497, 2016. 1058-5893 http://hdl.handle.net/11449/161622 10.1086/686794 WOS:000378090400002 WOS000378090400002.pdf |
url |
http://dx.doi.org/10.1086/686794 http://hdl.handle.net/11449/161622 |
identifier_str_mv |
International Journal Of Plant Sciences. Chicago: Univ Chicago Press, v. 177, n. 6, p. 481-497, 2016. 1058-5893 10.1086/686794 WOS:000378090400002 WOS000378090400002.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
International Journal Of Plant Sciences 0,798 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
481-497 application/pdf |
dc.publisher.none.fl_str_mv |
Univ Chicago Press |
publisher.none.fl_str_mv |
Univ Chicago Press |
dc.source.none.fl_str_mv |
Web of Science 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_ |
1808129558883336192 |