Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/897402
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dc.contributor.authorBOLDRINI, K. R.pt_BR
dc.contributor.authorADAMOWSKI, E. V.pt_BR
dc.contributor.authorSILVA, N.pt_BR
dc.contributor.authorPAGLIARINI, M. S.pt_BR
dc.contributor.authorVALLE, C. B. dopt_BR
dc.date.accessioned2011-08-05T11:11:11Zpt_BR
dc.date.accessioned2011-08-05T11:11:11Zpt_BR
dc.date.available2011-08-05T11:11:11Zpt_BR
dc.date.available2011-08-05T11:11:11Zpt_BR
dc.date.created2011-08-05pt_BR
dc.date.issued2011pt_BR
dc.identifier.citationGenetics and Molecular Research, v. 10, n.1, p. 169-176, 2011.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/897402pt_BR
dc.descriptionBrachiaria humidicola is a grass adapted to seasonally swampy grasslands in Africa; two cultivars, ?common? and Llanero, are widely used in Brazilian pastures. New cultivars are in great demand in order to diversify current production systems to achieve improved quality and yield. Cytological analyses of 55 accessions of this species available from the Embrapa Beef Cattle germplasm collection revealed that 27 are apomictic and have 2n = 54 chromosomes. Chromosome pairing as bi- to nonavalent associations at diakinesis indicated a basic chromosome number in this species of x = 6, as found in other closely related Brachiaria species. Thus, these 27 accessions are nonaploid (2n = 9x = 54). Abnormalities were found in the meiosis of these accessions, at variable frequencies. The most common abnormalities were those related to irregular chromosome segregation, which led to unbalanced gamete formation; but chromosome stickiness, cell fusion, and absence of cytokinesis were also recorded. Although some accessions have a low frequency of meiotic abnormalities, ensuring potentially good pollen viability, these cannot be used in hybridization due to a lack of sexual accessions with the same ploidy level.pt_BR
dc.language.isoengeng
dc.rightsopenAccesseng
dc.titleMeiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2011-08-05T11:11:11Zpt_BR
dc.subject.thesagroBrachiaria Humidicolapt_BR
dc.subject.thesagroGramínea Forrageirapt_BR
dc.subject.thesagroMelhoramento Genético Vegetalpt_BR
dc.subject.thesagroPastagempt_BR
riaa.ainfo.id897402pt_BR
riaa.ainfo.lastupdate2011-08-05pt_BR
dc.contributor.institutionK. R. BOLDRINI, 1Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá; E.V. Adamowski, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; N. Silva, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; M.S. Pagliarini, Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá; CACILDA BORGES DO VALLE, CNPGC.pt_BR
Aparece nas coleções:Artigo em periódico indexado (CNPGC)

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