Publicação:
Sporophytic apomixis in polyploid Anemopaegma species (Bignoniaceae) from central Brazil

dc.contributor.authorSampaio, Diana Salles
dc.contributor.authorBittencourt Júnior, Nelson Sabino [UNESP]
dc.contributor.authorOliveira, Paulo Eugênio
dc.contributor.institutionUniversidade Federal de Uberlândia (UFU)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:30:33Z
dc.date.available2014-05-27T11:30:33Z
dc.date.issued2013-09-01
dc.description.abstractApomixis and polyploidy have been important in the evolution of the angiosperms, and sporophytic apomixis has been associated with polyembryony and polyploidy in tropical floras. We studied the occurrence of polyembryony in populations of tetraploid Anemopaegma acutifolium, A.arvense and A.glaucum from the Brazilian cerrados, and histological features of sexual and apomictic processes were investigated in A.acutifolium. All populations and species were polyembryonic (68.9-98.4% of seeds). Normal double fertilization occurred in most ovules, with exceptions being that 3% of ovules were penetrated but not fertilized and in 4% of ovules both synergids were penetrated. The penetration of both synergids suggests a continuous attraction of pollen tubes and polyspermy. Adventitious embryo precursor cells (AEPs) arose from nucellar and integumental cells of the ovule in pollinated and unpollinated A.acutifolium, indicating sporophytic apomixis. However, further embryo and endosperm development required pollination and fertilization. This pseudogamy also allows concurrent sexual embryo development. Similar polyembryony rates and polyploidy indicated that A.arvense and A.glaucum are also apomictic, forming an agamic complex similar to that observed for some species of confamilial, but not closely related Handroanthus. The co-occurrence of apomixis and polyploidy in different groups of Bignoniaceae indicates homoplasious origin of these agamic complexes. © 2013 The Linnean Society of London.en
dc.description.affiliationInstituto de Biologia Universidade Federal de Uberlândia, Campus Umuarama, Uberlândia, 38400-902 Minas Gerais
dc.description.affiliationDepartamento de Zoologia e Botânica Universidade Estadual Paulista 'Júlio de Mesquita Filho' Campus de São José do Rio Preto, Rua Cristóvão Colombo, 2265 Jardim Nazareth, São José do Rio Preto, 15054-000 Sao Paulo
dc.description.affiliationUnespDepartamento de Zoologia e Botânica Universidade Estadual Paulista 'Júlio de Mesquita Filho' Campus de São José do Rio Preto, Rua Cristóvão Colombo, 2265 Jardim Nazareth, São José do Rio Preto, 15054-000 Sao Paulo
dc.format.extent77-91
dc.identifierhttp://dx.doi.org/10.1111/boj.12076
dc.identifier.citationBotanical Journal of the Linnean Society, v. 173, n. 1, p. 77-91, 2013.
dc.identifier.doi10.1111/boj.12076
dc.identifier.issn0024-4074
dc.identifier.issn1095-8339
dc.identifier.lattes7010826495155959
dc.identifier.scopus2-s2.0-84882637002
dc.identifier.urihttp://hdl.handle.net/11449/76439
dc.identifier.wosWOS:000323322900005
dc.language.isoeng
dc.relation.ispartofBotanical Journal of the Linnean Society
dc.relation.ispartofjcr3.124
dc.relation.ispartofsjr1,352
dc.relation.ispartofsjr1,352
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectCatuaba
dc.subjectDouble fertilization
dc.subjectPolyembryony
dc.subjectPolyspermy
dc.subjectPseudogamy
dc.subjectSynergids
dc.subjectTetraploid
dc.subjectangiosperm
dc.subjectapomixis
dc.subjectembryo
dc.subjectevolution
dc.subjectpollen
dc.subjectpollination
dc.subjectpolyploidy
dc.titleSporophytic apomixis in polyploid Anemopaegma species (Bignoniaceae) from central Brazilen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dspace.entity.typePublication
unesp.advisor.lattes7010826495155959
unesp.author.orcid0000-0002-1331-0783[2]
unesp.author.orcid0000-0002-6162-8702[3]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Biociências, Letras e Ciências Exatas, São José do Rio Pretopt
unesp.departmentZoologia e Botânica - IBILCEpt

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