01468naa a2200229 a 450000100080000000500110000800800410001910000250006024500850008526000090017052007950017965000250097465000350099965000130103465300220104765300160106965300220108570000230110770000220113070000200115277300660117215127972009-10-13       2003    bl ---       0--  u    #d1 aMENDES-BONATO, A. B.  aNormal microspore production after cell fusion in Brachiaria jubata (Gramineae).  c2003  aCytogenetic studies were carried out on 22 accessions of Brachiaria jubata from the Embrapa Beef Cattle Brachiaria collection. One accession was diploid (2n = 2x = 18) and the remaining 21 were tetraploid (2n = 4x = 36). Among five tetraploid accessions, a specific and constant pattern of cell fusion involving only two microsporocytes was recorded. Meiosis proceeded normally from prophase I to the end, giving rise to an octad with normal microspores that developed into fertile pollen grains. Regular octad formation was possible because each cellular chromosome set was maintained in its proper domain, spindles were correctly positioned, and cytokinesis planes were formed in the correct places. Such behavior of meiosis in syncytes has never been reported in any other plant species.  aGramínea Forrageira  aMelhoramento Genético Vegetal  aPastagem  aBrachiaria jubata  aBraquiária  aMicrosporogênese1 aRISSO-PASCOTTO, C.1 aPAGLIARINI, M. S.1 aVALLE, C. B. do  tGenetics and Molecular Biologygv.26, n. 4, p. 517-520, 2003.