Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning

Detalhes bibliográficos
Autor(a) principal: Rudall, Paula J.
Data de Publicação: 2016
Outros Autores: Alves, Marccus, Sajo, Maria das Gracas [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.7717/peerj.1653
http://hdl.handle.net/11449/165079
Resumo: Background and Aims. A recently described Brazilian species, Lacandonia brasiliana, shares with its longer established putative sister species from Mexico, L. schismatica, inverted floral patterning (carpels surrounding stamens) that is almost unique among angiosperms. We present a detailed ontogenetic study of L. brasiliana for comparison with other members of the tribe Triurideae (Triuridaceae) to explore the possible evolutionary origins of inside-out'' flowers. Methods. Wild-source populations of L. brasiliana were compared morphologically and ontogenetically with related species of Triurideae, using light and scanning electron microscopy. Key Results. Relatively few morphological differences separate flowers of L. brasiliana and L. schismatica. Both species have tepals with late-developing subapical appendages. In both species, the three central (almost sessile) anthers develop precociously with respect to the carpels; the anthers remain closed, and fertilization is achieved via pollen-tube growth from germinating pollen grains of the same cleistogamous flower. Carpels are initiated on fascicles. Conclusions. The close similarity between the two Lacandonia species makes it unlikely that they arose independently from two separate homeotic transformation events; they could either represent sister species or two populations of a single disjunct species. Our study underlines the problematic generic and species boundaries within Triurideae. We present an evolutionary scenario of character evolution in Triuridaceae. The inside-out Lacandonia flower could have resulted from a stabilized homeotic transformation; this hypothesis is not in conflict with constrasting theories of the origin of the Triuridaceae flower, which coincided with a shift to unisexuality. The unisexual yet highly plastic flowers that are typical of Triuridaceae could have pre-adapted the origin of the extraordinary Lacandonia morphology.
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spelling Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterningLacandoniaEvolutionary transformationInside-out flowersMycoheterotrophsUnisexualityTriuridaceaePandanalesBackground and Aims. A recently described Brazilian species, Lacandonia brasiliana, shares with its longer established putative sister species from Mexico, L. schismatica, inverted floral patterning (carpels surrounding stamens) that is almost unique among angiosperms. We present a detailed ontogenetic study of L. brasiliana for comparison with other members of the tribe Triurideae (Triuridaceae) to explore the possible evolutionary origins of inside-out'' flowers. Methods. Wild-source populations of L. brasiliana were compared morphologically and ontogenetically with related species of Triurideae, using light and scanning electron microscopy. Key Results. Relatively few morphological differences separate flowers of L. brasiliana and L. schismatica. Both species have tepals with late-developing subapical appendages. In both species, the three central (almost sessile) anthers develop precociously with respect to the carpels; the anthers remain closed, and fertilization is achieved via pollen-tube growth from germinating pollen grains of the same cleistogamous flower. Carpels are initiated on fascicles. Conclusions. The close similarity between the two Lacandonia species makes it unlikely that they arose independently from two separate homeotic transformation events; they could either represent sister species or two populations of a single disjunct species. Our study underlines the problematic generic and species boundaries within Triurideae. We present an evolutionary scenario of character evolution in Triuridaceae. The inside-out Lacandonia flower could have resulted from a stabilized homeotic transformation; this hypothesis is not in conflict with constrasting theories of the origin of the Triuridaceae flower, which coincided with a shift to unisexuality. The unisexual yet highly plastic flowers that are typical of Triuridaceae could have pre-adapted the origin of the extraordinary Lacandonia morphology.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Royal Bot Gardens, Comparat Plant & Fungal Biol, Richmond, Surrey, EnglandUniv Fed Pernambuco, Dept Bot, Recife, PE, BrazilUniv Estadual Paulista, Inst Biociencias, Sao Paulo, BrazilUniv Estadual Paulista, Inst Biociencias, Sao Paulo, BrazilPeerj IncRoyal Bot GardensUniversidade Federal de Pernambuco (UFPE)Universidade Estadual Paulista (Unesp)Rudall, Paula J.Alves, MarccusSajo, Maria das Gracas [UNESP]2018-11-27T10:20:23Z2018-11-27T10:20:23Z2016-02-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article25application/pdfhttp://dx.doi.org/10.7717/peerj.1653Peerj. London: Peerj Inc, v. 4, 25 p., 2016.2167-8359http://hdl.handle.net/11449/16507910.7717/peerj.1653WOS:000370933200007WOS000370933200007.pdf2126319926799273Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPeerj1,087info:eu-repo/semantics/openAccess2023-12-26T06:13:31Zoai:repositorio.unesp.br:11449/165079Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:17:38.918454Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
title Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
spellingShingle Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
Rudall, Paula J.
Lacandonia
Evolutionary transformation
Inside-out flowers
Mycoheterotrophs
Unisexuality
Triuridaceae
Pandanales
title_short Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
title_full Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
title_fullStr Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
title_full_unstemmed Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
title_sort Inside-out flowers of Lacandonia brasiliana (Triuridaceae) provide new insights into fundamental aspects of floral patterning
author Rudall, Paula J.
author_facet Rudall, Paula J.
Alves, Marccus
Sajo, Maria das Gracas [UNESP]
author_role author
author2 Alves, Marccus
Sajo, Maria das Gracas [UNESP]
author2_role author
author
dc.contributor.none.fl_str_mv Royal Bot Gardens
Universidade Federal de Pernambuco (UFPE)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Rudall, Paula J.
Alves, Marccus
Sajo, Maria das Gracas [UNESP]
dc.subject.por.fl_str_mv Lacandonia
Evolutionary transformation
Inside-out flowers
Mycoheterotrophs
Unisexuality
Triuridaceae
Pandanales
topic Lacandonia
Evolutionary transformation
Inside-out flowers
Mycoheterotrophs
Unisexuality
Triuridaceae
Pandanales
description Background and Aims. A recently described Brazilian species, Lacandonia brasiliana, shares with its longer established putative sister species from Mexico, L. schismatica, inverted floral patterning (carpels surrounding stamens) that is almost unique among angiosperms. We present a detailed ontogenetic study of L. brasiliana for comparison with other members of the tribe Triurideae (Triuridaceae) to explore the possible evolutionary origins of inside-out'' flowers. Methods. Wild-source populations of L. brasiliana were compared morphologically and ontogenetically with related species of Triurideae, using light and scanning electron microscopy. Key Results. Relatively few morphological differences separate flowers of L. brasiliana and L. schismatica. Both species have tepals with late-developing subapical appendages. In both species, the three central (almost sessile) anthers develop precociously with respect to the carpels; the anthers remain closed, and fertilization is achieved via pollen-tube growth from germinating pollen grains of the same cleistogamous flower. Carpels are initiated on fascicles. Conclusions. The close similarity between the two Lacandonia species makes it unlikely that they arose independently from two separate homeotic transformation events; they could either represent sister species or two populations of a single disjunct species. Our study underlines the problematic generic and species boundaries within Triurideae. We present an evolutionary scenario of character evolution in Triuridaceae. The inside-out Lacandonia flower could have resulted from a stabilized homeotic transformation; this hypothesis is not in conflict with constrasting theories of the origin of the Triuridaceae flower, which coincided with a shift to unisexuality. The unisexual yet highly plastic flowers that are typical of Triuridaceae could have pre-adapted the origin of the extraordinary Lacandonia morphology.
publishDate 2016
dc.date.none.fl_str_mv 2016-02-04
2018-11-27T10:20:23Z
2018-11-27T10:20:23Z
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/10.7717/peerj.1653
Peerj. London: Peerj Inc, v. 4, 25 p., 2016.
2167-8359
http://hdl.handle.net/11449/165079
10.7717/peerj.1653
WOS:000370933200007
WOS000370933200007.pdf
2126319926799273
url http://dx.doi.org/10.7717/peerj.1653
http://hdl.handle.net/11449/165079
identifier_str_mv Peerj. London: Peerj Inc, v. 4, 25 p., 2016.
2167-8359
10.7717/peerj.1653
WOS:000370933200007
WOS000370933200007.pdf
2126319926799273
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Peerj
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application/pdf
dc.publisher.none.fl_str_mv Peerj Inc
publisher.none.fl_str_mv Peerj Inc
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)
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institution UNESP
reponame_str Repositório Institucional da UNESP
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repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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