Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria ( Gramineae ) hybrid
Genet. mol. biol
;
29(1): 122-125, 2006. ilus, tab
Article
in English
| LILACS
| ID: lil-424747
RESUMO
This paper reports a case of abnormal spindle orientation during microsporogenesis in an interspecific hybrid of the tropical grass Brachiaria. In the affected plant, prophase I was normal. In metaphase I, bivalents were regularly co-oriented but distantly positioned and spread over the equatorial plate. In anaphase I, chromosomes failed to converge into focused poles due to parallel spindle fibers. As a consequence, in telophase I, an elongated nucleus or several micronuclei were observed in each pole. In the second division, the behavior was the same, leading to polyads with several micronuclei. A total of 40 percent of meiotic products were affected. The use of this hybrid in production systems needing good-quality seeds is discussed.
Full text:
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Index:
LILACS (Americas)
Main subject:
Brachiaria
/
Meiosis
/
Microtubules
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2006
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Empresa Brasileira de Pesquisa Agropecuária Gado de Corte/BR
/
Universidade Estadual de Maringá/BR
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