01172naa a2200193 a 450000100080000000500110000800800410001910000230006024500980008326000090018152005960019065000150078665000350080165000130083665300160084970000220086570000200088777300710090716625922010-04-27       2009    bl ---       0--  u    #d1 aRISSO-PASCOTTO, C.  aChromosome number and microsporogenesis of two accessions of Brachiaria dura Stapf (Poaceae).  c2009  aThe 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.  aBrachiaria  aMelhoramento Genético Vegetal  aPastagem  aBraquiária1 aPAGLIARINI, M. S.1 aVALLE, C. B. do  tBiota Neotropicagv.9, n.2, p. 257-263, 2009. Short Communication.