01794naa a2200277 a 450000100080000000500110000800800410001910000200006024501360008026000090021652009520022565000260117765000120120365000180121565000350123365000130126865000220128165300160130365300110131965300170133065300230134765300210137070000220139170000200141377300830143313268502018-01-29       2008    bl uuuu     u00u1 u    #d1 aFUZINATO, V. A.  aEvaluation of microsporogenesis in an interspecific Brachiaria hybrid (Poaceae) collected in distinct years.h[electronic resource]  c2008  aMicrosporogenesis in an interspecific Brachiaria hybrid, grown in the field under natural environmental conditions in Brazilian savannas, was analyzed in three distinct years of collection. Several types of meiotic abnormalities were recorded during those three years, but varied in type and frequency depending on the year. The average temperature and rainfall 15 days before collection was unusually high in those years. The percentage of abnormal meiocytes recorded was 62% in 2001, 73% in 2004, and 77% in 2005. The abnormalities observed during microsporogenesis compromised pollen viability by generating unbalanced gametes or affecting nucleolus organization. The environmental conditions under which the hybrid was growing could have affected the genetic control of meiosis. More detailed studies, under controlled conditions, are necessary to better understand the effects of environmental factors on Brachiaria microsporogenesis hybrids.  aCitogenética vegetal  aHibrido  aMeio ambiente  aMelhoramento genético vegetal  aPastagem  aPlanta Forrageira  aBraquiária  aBrasil  aCampo Grande  aMato Grosso do Sul  aMicrosporogênse1 aPAGLIARINI, M. S.1 aVALLE, C. B. do  tGenetics and Molecular Research, Ribeirão Pretogv.7, n. 2, p. 424-432, 2008.