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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
30/09/2009 |
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Data da última atualização: |
20/05/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MENDES-BONATO, A. B.; JUNQUEIRA FILHO, R. G.; PAGLIARINI, M. S.; VALLE, C. B. do; PENTEADO, M. I. de O. |
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Afiliação: |
ANDRÉA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; ROBERTO GARGIONE JUNQUEIRA FILHO, UNIVERSIDADE ESTDUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC; MARIA ISABEL DE OLIVEIRA PENTEADO, SPRI. |
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Título: |
Unusual cytological patterns of microsporogenesis in Brachiaria decumbens: abnormalities in spindle and defective cytokinesis causing precocious cellularization. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Cell Biology International, v. 26, n. 7, p. 641-646, July 2002. |
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ISSN: |
1065-6995 |
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DOI: |
https://doi.org/10.1006/cbir.2002.0929 |
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Idioma: |
Inglês |
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Conteúdo: |
Cytogenetic studies carried out in the tetraploid accession BRA001068 of Brachiaria decumbens, also known as cv. Basilisk, revealed an unusual pattern of microsporogenesis. The spindle in metaphase I and anaphase I became heavily stained with propionic carmine. In telophase I, the interzonal microtubules continued to be intensely stained, and during the phragmoplast formation the fibers were pushed to the cell wall, persisting until prophase II, even after cytokinesis. Due to its tetraploid condition, the accession presented many cells with precocious chromosome migration to the poles in metaphase I and laggards in anaphase I that gave rise to micronuclei in telophase I. While in other polyploid accessions of Brachiaria micronuclei remained in this condition until the second cytokinesis, the micronuclei in this accession organized their own spindle in the second division. In several microsporocytes, the micronuclei with their minispindle were divided further into microcytes by additional cytokinesis. Some curious planes of cytokinesis were found in some cells, with partitioning of cytoplasm into cells of irregular shape. The result consisted of a high frequency of abnormal products of meiosis. Quadrivalents were observed in diakinesis at low frequency, which suggests a segmental allotetraploid and the inability of both genomes to co-ordinate their activities, leading to multiple spindle and precocious cellularization. In spite of abnormal meiotic products reducing pollen fertility, seed production was normal. Enough normal pollen was available to fertilize the central-cell nucleus of the embryo sac and produce normal endosperm in this pseudogamous aposporous apomictic accession. MenosCytogenetic studies carried out in the tetraploid accession BRA001068 of Brachiaria decumbens, also known as cv. Basilisk, revealed an unusual pattern of microsporogenesis. The spindle in metaphase I and anaphase I became heavily stained with propionic carmine. In telophase I, the interzonal microtubules continued to be intensely stained, and during the phragmoplast formation the fibers were pushed to the cell wall, persisting until prophase II, even after cytokinesis. Due to its tetraploid condition, the accession presented many cells with precocious chromosome migration to the poles in metaphase I and laggards in anaphase I that gave rise to micronuclei in telophase I. While in other polyploid accessions of Brachiaria micronuclei remained in this condition until the second cytokinesis, the micronuclei in this accession organized their own spindle in the second division. In several microsporocytes, the micronuclei with their minispindle were divided further into microcytes by additional cytokinesis. Some curious planes of cytokinesis were found in some cells, with partitioning of cytoplasm into cells of irregular shape. The result consisted of a high frequency of abnormal products of meiosis. Quadrivalents were observed in diakinesis at low frequency, which suggests a segmental allotetraploid and the inability of both genomes to co-ordinate their activities, leading to multiple spindle and precocious cellularization. In spite of abnormal meiotic products reducing pollen fert... Mostrar Tudo |
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Palavras-Chave: |
Braquiária; Microsporogênese. |
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Thesagro: |
Brachiaria Decumbens; Citogenética Vegetal; Gramínea Forrageira; Meiose; Melhoramento Genético Vegetal; Pastagem. |
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Thesaurus Nal: |
Cytokinesis; Meiosis. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02736naa a2200313 a 4500
001 1512827
005 2025-05-20
008 2002 bl uuuu u00u1 u #d
022 $a1065-6995
024 7 $ahttps://doi.org/10.1006/cbir.2002.0929$2DOI
100 1 $aMENDES-BONATO, A. B.
245 $aUnusual cytological patterns of microsporogenesis in Brachiaria decumbens$babnormalities in spindle and defective cytokinesis causing precocious cellularization.$h[electronic resource]
260 $c2002
520 $aCytogenetic studies carried out in the tetraploid accession BRA001068 of Brachiaria decumbens, also known as cv. Basilisk, revealed an unusual pattern of microsporogenesis. The spindle in metaphase I and anaphase I became heavily stained with propionic carmine. In telophase I, the interzonal microtubules continued to be intensely stained, and during the phragmoplast formation the fibers were pushed to the cell wall, persisting until prophase II, even after cytokinesis. Due to its tetraploid condition, the accession presented many cells with precocious chromosome migration to the poles in metaphase I and laggards in anaphase I that gave rise to micronuclei in telophase I. While in other polyploid accessions of Brachiaria micronuclei remained in this condition until the second cytokinesis, the micronuclei in this accession organized their own spindle in the second division. In several microsporocytes, the micronuclei with their minispindle were divided further into microcytes by additional cytokinesis. Some curious planes of cytokinesis were found in some cells, with partitioning of cytoplasm into cells of irregular shape. The result consisted of a high frequency of abnormal products of meiosis. Quadrivalents were observed in diakinesis at low frequency, which suggests a segmental allotetraploid and the inability of both genomes to co-ordinate their activities, leading to multiple spindle and precocious cellularization. In spite of abnormal meiotic products reducing pollen fertility, seed production was normal. Enough normal pollen was available to fertilize the central-cell nucleus of the embryo sac and produce normal endosperm in this pseudogamous aposporous apomictic accession.
650 $aCytokinesis
650 $aMeiosis
650 $aBrachiaria Decumbens
650 $aCitogenética Vegetal
650 $aGramínea Forrageira
650 $aMeiose
650 $aMelhoramento Genético Vegetal
650 $aPastagem
653 $aBraquiária
653 $aMicrosporogênese
700 1 $aJUNQUEIRA FILHO, R. G.
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
700 1 $aPENTEADO, M. I. de O.
773 $tCell Biology International$gv. 26, n. 7, p. 641-646, July 2002.
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| 2. |  | AFONSO, T. M.; HADLICH, J. C.; IGARASI, M. S.; RODRIGUES, V. S.; QUIRINO, C. R.; CARVALHO, G. M. C. Avaliação do desempenho animal, características de carcaça e qualidade da carne de diferentes cruzamentos com curraleiro Pé-duro. Revista RG News, v. 4, n. 3, p. 35, 2018. Edição especial dos Anais do V Congresso Brasileiro de Recursos Genéticos, Fortaleza, nov. 2018.| Tipo: Resumo em Anais de Congresso |
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| 3. | | AFONSO, T. M.; CARVALHO, G. M. C.; HADLICH, J. C.; RODRIGUES, V. de S.; BARROS, D. A.; VASCONCELOS, A. B. de; IGARASI, M. S. Use of crosses for sustainability in livestock farming in the Brazilian Meio-Norte region. Revista Brasileira de Zootecnia, v. 49, e20190228, 2020.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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