Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria ( Gramineae ) hybrid
Genet. mol. biol
; Genet. mol. biol;29(1): 122-125, 2006. ilus, tab
Article
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| LILACS
| ID: lil-424747
Biblioteca responsable:
BR26.1
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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
LILACS
Asunto principal:
Brachiaria
/
Meiosis
/
Microtúbulos
Idioma:
En
Revista:
Genet. mol. biol
Asunto de la revista:
GENETICA
Año:
2006
Tipo del documento:
Article
País de afiliación:
Brasil
Pais de publicación:
Brasil