Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid
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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Sociedade Brasileira de Genética
2006
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oai:scielo:S1415-475720060001000232006-03-10Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybridMendes-Bonato,Andréa BeatrizPagliarini,Maria SuelyValle,Cacilda Borges do Brachiaria interspecific hybrid meiosis spindle abnormality tropical grass 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.info:eu-repo/semantics/openAccessSociedade Brasileira de GenéticaGenetics and Molecular Biology v.29 n.1 20062006-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100023en10.1590/S1415-47572006000100023 |
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Mendes-Bonato,Andréa Beatriz Pagliarini,Maria Suely Valle,Cacilda Borges do |
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Mendes-Bonato,Andréa Beatriz Pagliarini,Maria Suely Valle,Cacilda Borges do Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid |
author_facet |
Mendes-Bonato,Andréa Beatriz Pagliarini,Maria Suely Valle,Cacilda Borges do |
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Mendes-Bonato,Andréa Beatriz |
title |
Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid |
title_short |
Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid |
title_full |
Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid |
title_fullStr |
Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid |
title_full_unstemmed |
Abnormal spindle orientation during microsporogenesis in an interspecific Brachiaria (Gramineae) hybrid |
title_sort |
abnormal spindle orientation during microsporogenesis in an interspecific brachiaria (gramineae) hybrid |
description |
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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Sociedade Brasileira de Genética |
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2006 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100023 |
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AT mendesbonatoandreabeatriz abnormalspindleorientationduringmicrosporogenesisinaninterspecificbrachiariagramineaehybrid AT pagliarinimariasuely abnormalspindleorientationduringmicrosporogenesisinaninterspecificbrachiariagramineaehybrid AT vallecacildaborgesdo abnormalspindleorientationduringmicrosporogenesisinaninterspecificbrachiariagramineaehybrid |
_version_ |
1756418983151534080 |