Cytogenetics and embryology of Eupatorium laevigatum (Compositae)

dc.contributor.authorBertasso-Borges, Maristela Sanches
dc.contributor.authorColeman, James Robert [UNESP]
dc.contributor.institutionCentro Universitário de Rio Preto
dc.contributor.institutionCentro Universitário de Votuporanga
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:04:14Z
dc.date.available2014-05-20T14:04:14Z
dc.date.issued2005-03-01
dc.description.abstractEmbryological studies indicate Eupatorium laevigatum to have Antennaria type diplospory with precocious embryony. The embryo sac is of the Polygonum type and the polar nuclei fuse before anthesis (maturation of the stamens). Endosperm development is autonomous and the central cell divides only after the initial stages of embryo formation. It is estimated that about 10% of the florets in anthesis contain an undivided egg which can be used for sexual reproduction. The study of microsporogenesis revealed abnormalities in chromosome pairing which result in the formation of univalents, bivalents, trivalents and higher polyvalents, with the consequent production of lagging chromosomes, unbalanced nuclei, micronuclei and sterile pollen. We found that, as represented by the material studied, E. laevigatum is an autohexaploid (2n = 6x = 60) in which each chromosome of a basic set of ten chromosomes is repeated six times and that E. laevigatum is an essentialy obligate apomictic.en
dc.description.affiliationCentro Universitário de Rio Preto
dc.description.affiliationCentro Universitário de Votuporanga
dc.description.affiliationUniversidade Estadual Paulista Instituto de Biociências, Letras e Ciências Exatas de São José do Rio Preto Departamento de Botânica
dc.description.affiliationUnespUniversidade Estadual Paulista Instituto de Biociências, Letras e Ciências Exatas de São José do Rio Preto Departamento de Botânica
dc.format.extent123-128
dc.identifierhttp://dx.doi.org/10.1590/S1415-47572005000100022
dc.identifier.citationGenetics and Molecular Biology. Sociedade Brasileira de Genética, v. 28, n. 1, p. 123-128, 2005.
dc.identifier.doi10.1590/S1415-47572005000100022
dc.identifier.fileS1415-47572005000100022.pdf
dc.identifier.issn1415-4757
dc.identifier.scieloS1415-47572005000100022
dc.identifier.urihttp://hdl.handle.net/11449/22543
dc.language.isoeng
dc.publisherSociedade Brasileira de Genética
dc.relation.ispartofGenetics and Molecular Biology
dc.relation.ispartofjcr1.493
dc.relation.ispartofsjr0,638
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectEupatoriumen
dc.subjectApomixisen
dc.subjectplant cytogeneticsen
dc.subjectPlant embryologyen
dc.subjectAsteraceaeen
dc.titleCytogenetics and embryology of Eupatorium laevigatum (Compositae)en
dc.typeArtigo
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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