Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum

Detalhes bibliográficos
Autor(a) principal: Vieira, M. F.
Data de Publicação: 2002
Outros Autores: Shepherd, G. J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: LOCUS Repositório Institucional da UFV
Texto Completo: http://dx.doi.org/10.1007/s00606-002-0204-2
http://www.locus.ufv.br/handle/123456789/22238
Resumo: The floral morphology of seven Oxypetalum species and, in particular, the spatial relationship between the five stigmatic chambers and two separate ovaries of their flowers with respect to transmission of the pollen tube are studied. In all species, except O. banksii subsp. banksii, floral morphology is similar to that in other Asclepiadeae, and the flowers pollinated with one pollinium develop only one follicle, which means compitum absence. In O. banksii subsp. banksii flowers, the secretory interstaminal tissue lines the inner walls of the stigmatic chambers as in the other species studied, but it also reaches the upper part of the inner surface of the filament tube, where it surrounds the styles, an unprecedented feature for Asclepiadaceae. This tissue secretes nectar and mucilage; the latter acts as transmitting medium for the growth of pollen tubes from pollinia inserted and hydrated in stigmatic chambers (“hyperstigmas”). Mucilage also functions as an extragynoecial compitum: in flowers pollinated with one pollinium both carpels develop into a follicle.
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spelling Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitumCompitumFloral morphologyHyper- stigmaOxypetalumPollen tube pathwayThe floral morphology of seven Oxypetalum species and, in particular, the spatial relationship between the five stigmatic chambers and two separate ovaries of their flowers with respect to transmission of the pollen tube are studied. In all species, except O. banksii subsp. banksii, floral morphology is similar to that in other Asclepiadeae, and the flowers pollinated with one pollinium develop only one follicle, which means compitum absence. In O. banksii subsp. banksii flowers, the secretory interstaminal tissue lines the inner walls of the stigmatic chambers as in the other species studied, but it also reaches the upper part of the inner surface of the filament tube, where it surrounds the styles, an unprecedented feature for Asclepiadaceae. This tissue secretes nectar and mucilage; the latter acts as transmitting medium for the growth of pollen tubes from pollinia inserted and hydrated in stigmatic chambers (“hyperstigmas”). Mucilage also functions as an extragynoecial compitum: in flowers pollinated with one pollinium both carpels develop into a follicle.Plant Systematics and Evolution2018-10-10T16:59:54Z2018-10-10T16:59:54Z2002-10-14info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlepdfapplication/pdf21996881http://dx.doi.org/10.1007/s00606-002-0204-2http://www.locus.ufv.br/handle/123456789/22238engv. 233, n. 3– 4, p. 199– 206, out. 2002Springer Nature Switzerland AG.info:eu-repo/semantics/openAccessVieira, M. F.Shepherd, G. J.reponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFV2024-07-12T07:55:44Zoai:locus.ufv.br:123456789/22238Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452024-07-12T07:55:44LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.none.fl_str_mv Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
title Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
spellingShingle Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
Vieira, M. F.
Compitum
Floral morphology
Hyper- stigma
Oxypetalum
Pollen tube pathway
title_short Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
title_full Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
title_fullStr Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
title_full_unstemmed Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
title_sort Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum
author Vieira, M. F.
author_facet Vieira, M. F.
Shepherd, G. J.
author_role author
author2 Shepherd, G. J.
author2_role author
dc.contributor.author.fl_str_mv Vieira, M. F.
Shepherd, G. J.
dc.subject.por.fl_str_mv Compitum
Floral morphology
Hyper- stigma
Oxypetalum
Pollen tube pathway
topic Compitum
Floral morphology
Hyper- stigma
Oxypetalum
Pollen tube pathway
description The floral morphology of seven Oxypetalum species and, in particular, the spatial relationship between the five stigmatic chambers and two separate ovaries of their flowers with respect to transmission of the pollen tube are studied. In all species, except O. banksii subsp. banksii, floral morphology is similar to that in other Asclepiadeae, and the flowers pollinated with one pollinium develop only one follicle, which means compitum absence. In O. banksii subsp. banksii flowers, the secretory interstaminal tissue lines the inner walls of the stigmatic chambers as in the other species studied, but it also reaches the upper part of the inner surface of the filament tube, where it surrounds the styles, an unprecedented feature for Asclepiadaceae. This tissue secretes nectar and mucilage; the latter acts as transmitting medium for the growth of pollen tubes from pollinia inserted and hydrated in stigmatic chambers (“hyperstigmas”). Mucilage also functions as an extragynoecial compitum: in flowers pollinated with one pollinium both carpels develop into a follicle.
publishDate 2002
dc.date.none.fl_str_mv 2002-10-14
2018-10-10T16:59:54Z
2018-10-10T16:59:54Z
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 21996881
http://dx.doi.org/10.1007/s00606-002-0204-2
http://www.locus.ufv.br/handle/123456789/22238
identifier_str_mv 21996881
url http://dx.doi.org/10.1007/s00606-002-0204-2
http://www.locus.ufv.br/handle/123456789/22238
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv v. 233, n. 3– 4, p. 199– 206, out. 2002
dc.rights.driver.fl_str_mv Springer Nature Switzerland AG.
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Springer Nature Switzerland AG.
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv pdf
application/pdf
dc.publisher.none.fl_str_mv Plant Systematics and Evolution
publisher.none.fl_str_mv Plant Systematics and Evolution
dc.source.none.fl_str_mv reponame:LOCUS Repositório Institucional da UFV
instname:Universidade Federal de Viçosa (UFV)
instacron:UFV
instname_str Universidade Federal de Viçosa (UFV)
instacron_str UFV
institution UFV
reponame_str LOCUS Repositório Institucional da UFV
collection LOCUS Repositório Institucional da UFV
repository.name.fl_str_mv LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)
repository.mail.fl_str_mv fabiojreis@ufv.br
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