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Abnormal cytokinesis in microsporogenesis of Brachiaria humidicola (Poaceae: Paniceae). Repositório Alice
ADAMOWSKI, E. V.; BOLDRINI, K. R.; PAGLIARINI, M. S.; VALLE, C. B. do.
Microsporogenesis was evaluated in the Brachiaria humidicola collection of the Embrapa Beef Cattle Center, represented by 60 acessions. One acession (H121) presented an abnormal pattern of cytokinesis that had never been reported in this genus. Among 900 meiocytes analyzed in the first division, 10.7% underwent precocious and multiple cytokinesis in metaphase I, fractionating the genome and the cytoplasm into two or more parts. The expected cytokinesis after telophase I did not occur. The abnormal meiocytes from the first division entered the second division but the second cytokinesis after telophase II was also abnormal. Among the 857 meiocytes analyzed in the second division, 10.9% presented abnormal, incomplete or total absence of cytokinesis. Dyads and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Braquiária; Brachiaria humidicola; Citocinese; Campo Grande; Mato Grosso do Sul; Brasil; Feed crops; Feed grasses; Citokinesis; Brazil; Melhoramento genético vegetal; Citogenética vegetal; Planta Forrageira; Brachiaria humidicola; Meiose; Plant breeding; Cytogenetics.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/326647
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Meiotic behavior in nonaploid accessions of Brachiaria humidicola (Poaceae) and implications for breeding. Repositório Alice
BOLDRINI, K. R.; ADAMOWSKI, E. V.; SILVA, N.; PAGLIARINI, M. S.; VALLE, C. B. do.
Brachiaria 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...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Pastagem; Melhoramento genético vegetal; Gramínea forrageira; Brachiaria humidicola.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/897402
Registros recuperados: 2
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