Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid

AUTOR(ES)

Mendes-Bonato, Andréa Beatriz, Pagliarini, Maria Suely, Valle, Cacilda Borges do

FONTE

Genetics and Molecular Biology

DATA DE PUBLICAÇÃO

2006

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% of meiotic products were affected. The use of this hybrid in production systems needing good-quality seeds is discussed.

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