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2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae). Repositório Alice
GALLO, P. H; MICHELETTI, P. L.; BOLDRINI, K. R.; RISSO-PASCOLOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do..
Microsporogenesis of several Brachiaria species of the Brazilian collection at Embrapa Beef Cattle has been analyzed in detail. This paper reports abnormal cytokinesis in three accessions of three different species (Brachiaria humidicola, 2n = 4x = 36, Brachiaria decumbens, 2n = 4x = 36, and Brachiaria dura, 2n = 6x = 54). Chromosomes paired in bi-, tri-, and quadrivalents in these accessions, whereas chromosome segregation at meiosis I was characterized by exclusion of laggards as micronuclei. In a high number of meiocytes, the first sign of cytokinesis appeared only in metaphase II and did not divide the meiocyte into a dyad. Total absence of cytokinesis was also detected among meiocytes in the second division. Since in both cases the two metaphase...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Melhoramento genético vegetal; Citogenética vegetal; Poliploidia; Planta Forrageira; Gramínea forrageira; Braquiária; Brachiaria humidicola; Brachiaria decumbens; Brachiaria dura; Campo Grande; Mato Grosso do Sul; Brasil; Plant breeding; Cytogenetics; Polyploidy; Feed crops; Feed grasses; Brazil.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/326409
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Chromosome number and microsporogenesis of two accessions of Brachiaria dura Stapf (Poaceae) Biota Neotropica
Risso-Pascotto,Claudiceia; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
The two accessions of B. dura analyzed (DU01 and DU02) are hexaploid (2n = 6x = 54), derived from x = 9. Meiotic abnormalities, such as precocious chromosome migration to the poles, laggards and micronuclei, were recorded in low frequency in both accessions. The few multivalent chromosome association at diakinesis and meiotic stability suggested that hexaploidy probably resulted from chromosome doubling. In DU02, chromosome transfer (cytomixis) among meiocytes, involving part or the entire genome was observed. The implication of these findings for the Brachiaria breeding is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria dura; Meiosis; Chromosome number; Cytomixis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000200024
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