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Evaluation of microsporogenesis in an interspecific Brachiaria hybrid (Poaceae) collected in distinct years
Fuzinatto, V. A; Pagliarini, M. S; Valle, C. B.
  • Fuzinatto, V. A; Universidade Estadual de Maringá. Departamento de Biologia Celular e Genética. Maringá. BR
  • Pagliarini, M. S; Universidade Estadual de Maringá. Departamento de Biologia Celular e Genética. Maringá. BR
  • Valle, C. B; Embrapa Gado de Corte. Campo Grande. BR
Genet. mol. res. (Online) ; 7(2): 424-432, 2008. tab, ilus
Article in English | LILACS | ID: lil-640996
ABSTRACT
Microsporogenesis 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.
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Full text: Available Index: LILACS (Americas) Main subject: Brachiaria / Meiosis Language: English Journal: Genet. mol. res. (Online) Journal subject: Molecular Biology / Genetics Year: 2008 Type: Article Affiliation country: Brazil Institution/Affiliation country: Embrapa Gado de Corte/BR / Universidade Estadual de Maringá/BR

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Full text: Available Index: LILACS (Americas) Main subject: Brachiaria / Meiosis Language: English Journal: Genet. mol. res. (Online) Journal subject: Molecular Biology / Genetics Year: 2008 Type: Article Affiliation country: Brazil Institution/Affiliation country: Embrapa Gado de Corte/BR / Universidade Estadual de Maringá/BR