Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1093/botlinnean/boac046 http://hdl.handle.net/11449/245152 |
Resumo: | Leiothrix differs from other genera of Eriocaulaceae by having pistillate flowers with nectariferous and stigmatic branches that diverge at different heights on the style and staminate flowers with free or fused petals. To understand the ontogenetic processes that result in these morphological variations, we studied the development and floral vasculature in six species of the genus. In pistillate flowers, the nectariferous branches, which are in a carinal position, correspond to the apex of the carpels, whereas the stigmatic branches, in a commissural position, are formed by the marginal tissues of the carpels and initiate later than the nectariferous branches. The upper margins of the carpels elongate, forming a tubular structure that raises the stigmatic branches; the greater its development, the greater the distance between the stigmatic and nectariferous branches. In staminate flowers, the fusion of the petals appears to be post-genital in the median and apical portions and congenital in the more basal portion. Despite the differences in floral development, Leiothrix shares the same pattern of floral vasculature with other genera of Eriocaulaceae, exhibiting a central vascular plexus in the receptacle from which a single trace diverges for each sepal, petal and stamen. The staminodes are not vascularized. The dorsal carpellary bundles supply the nectariferous branches, but the ventral carpel bundles are reduced and are not involved in the supply of the ovules and stigmas. The differences in the height of insertion of the nectariferous branches are probably the result of selective pressure exerted by different groups of pollinating insects. Our hypothesis is that species in which the nectariferous branches are inserted below the stigmatic branches, and are therefore less accessible, exhibit a more specialized pollination system. The absence of nectariferous branches in L. angustifolia indicates secondary loss probably associated with spontaneous geitonogamy. |
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Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollinationflowergynoeciumheterochronynectaryontogenypostgenital fusionLeiothrix differs from other genera of Eriocaulaceae by having pistillate flowers with nectariferous and stigmatic branches that diverge at different heights on the style and staminate flowers with free or fused petals. To understand the ontogenetic processes that result in these morphological variations, we studied the development and floral vasculature in six species of the genus. In pistillate flowers, the nectariferous branches, which are in a carinal position, correspond to the apex of the carpels, whereas the stigmatic branches, in a commissural position, are formed by the marginal tissues of the carpels and initiate later than the nectariferous branches. The upper margins of the carpels elongate, forming a tubular structure that raises the stigmatic branches; the greater its development, the greater the distance between the stigmatic and nectariferous branches. In staminate flowers, the fusion of the petals appears to be post-genital in the median and apical portions and congenital in the more basal portion. Despite the differences in floral development, Leiothrix shares the same pattern of floral vasculature with other genera of Eriocaulaceae, exhibiting a central vascular plexus in the receptacle from which a single trace diverges for each sepal, petal and stamen. The staminodes are not vascularized. The dorsal carpellary bundles supply the nectariferous branches, but the ventral carpel bundles are reduced and are not involved in the supply of the ovules and stigmas. The differences in the height of insertion of the nectariferous branches are probably the result of selective pressure exerted by different groups of pollinating insects. Our hypothesis is that species in which the nectariferous branches are inserted below the stigmatic branches, and are therefore less accessible, exhibit a more specialized pollination system. The absence of nectariferous branches in L. angustifolia indicates secondary loss probably associated with spontaneous geitonogamy.Coordenação de Aperfeiçoamento de Pessoa de Nível Superior (CAPES)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Univ Estadual Paulista Julio de Mesquita Filho UNE, Dept Biodiversidade, Inst Biociencias, BR-13506900 Rio Claro, SP, BrazilUniv Sao Paulo, Dept Ciencias Biol, Escola Super Agr Luiz de Queiroz ESALQ, BR-13418900 Piracicaba, SP, BrazilUniv Estadual Paulista Julio de Mesquita Filho UNE, Dept Biodiversidade, Inst Biociencias, BR-13506900 Rio Claro, SP, BrazilCAPES: 001CNPq: 157531/2018-0Oxford Univ PressUniversidade Estadual Paulista (UNESP)Universidade de São Paulo (USP)Mascarenhas, Ana Angelica S. [UNESP]Scatena, Vera L. [UNESP]Oriani, Aline [UNESP]2023-07-29T11:38:42Z2023-07-29T11:38:42Z2022-12-08info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article154-174http://dx.doi.org/10.1093/botlinnean/boac046Botanical Journal of the Linnean Society. Oxford: Oxford Univ Press, v. 201, n. 2, p. 154-174, 2023.0024-4074http://hdl.handle.net/11449/24515210.1093/botlinnean/boac046WOS:000894161000001Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengBotanical Journal Of The Linnean Societyinfo:eu-repo/semantics/openAccess2023-07-29T11:38:42Zoai:repositorio.unesp.br:11449/245152Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:52:24.760398Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
title |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
spellingShingle |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination Mascarenhas, Ana Angelica S. [UNESP] flower gynoecium heterochrony nectary ontogeny post genital fusion |
title_short |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
title_full |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
title_fullStr |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
title_full_unstemmed |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
title_sort |
Understanding floral variation in Leiothrix (Poales: Eriocaulaceae): anatomy, development and insights into pollination |
author |
Mascarenhas, Ana Angelica S. [UNESP] |
author_facet |
Mascarenhas, Ana Angelica S. [UNESP] Scatena, Vera L. [UNESP] Oriani, Aline [UNESP] |
author_role |
author |
author2 |
Scatena, Vera L. [UNESP] Oriani, Aline [UNESP] |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) Universidade de São Paulo (USP) |
dc.contributor.author.fl_str_mv |
Mascarenhas, Ana Angelica S. [UNESP] Scatena, Vera L. [UNESP] Oriani, Aline [UNESP] |
dc.subject.por.fl_str_mv |
flower gynoecium heterochrony nectary ontogeny post genital fusion |
topic |
flower gynoecium heterochrony nectary ontogeny post genital fusion |
description |
Leiothrix differs from other genera of Eriocaulaceae by having pistillate flowers with nectariferous and stigmatic branches that diverge at different heights on the style and staminate flowers with free or fused petals. To understand the ontogenetic processes that result in these morphological variations, we studied the development and floral vasculature in six species of the genus. In pistillate flowers, the nectariferous branches, which are in a carinal position, correspond to the apex of the carpels, whereas the stigmatic branches, in a commissural position, are formed by the marginal tissues of the carpels and initiate later than the nectariferous branches. The upper margins of the carpels elongate, forming a tubular structure that raises the stigmatic branches; the greater its development, the greater the distance between the stigmatic and nectariferous branches. In staminate flowers, the fusion of the petals appears to be post-genital in the median and apical portions and congenital in the more basal portion. Despite the differences in floral development, Leiothrix shares the same pattern of floral vasculature with other genera of Eriocaulaceae, exhibiting a central vascular plexus in the receptacle from which a single trace diverges for each sepal, petal and stamen. The staminodes are not vascularized. The dorsal carpellary bundles supply the nectariferous branches, but the ventral carpel bundles are reduced and are not involved in the supply of the ovules and stigmas. The differences in the height of insertion of the nectariferous branches are probably the result of selective pressure exerted by different groups of pollinating insects. Our hypothesis is that species in which the nectariferous branches are inserted below the stigmatic branches, and are therefore less accessible, exhibit a more specialized pollination system. The absence of nectariferous branches in L. angustifolia indicates secondary loss probably associated with spontaneous geitonogamy. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-12-08 2023-07-29T11:38:42Z 2023-07-29T11:38:42Z |
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/10.1093/botlinnean/boac046 Botanical Journal of the Linnean Society. Oxford: Oxford Univ Press, v. 201, n. 2, p. 154-174, 2023. 0024-4074 http://hdl.handle.net/11449/245152 10.1093/botlinnean/boac046 WOS:000894161000001 |
url |
http://dx.doi.org/10.1093/botlinnean/boac046 http://hdl.handle.net/11449/245152 |
identifier_str_mv |
Botanical Journal of the Linnean Society. Oxford: Oxford Univ Press, v. 201, n. 2, p. 154-174, 2023. 0024-4074 10.1093/botlinnean/boac046 WOS:000894161000001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Botanical Journal Of The Linnean Society |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
154-174 |
dc.publisher.none.fl_str_mv |
Oxford Univ Press |
publisher.none.fl_str_mv |
Oxford Univ 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 |
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1808129468752986112 |