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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
04/01/2005 |
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Data da última atualização: |
31/08/2007 |
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Autoria: |
RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do; JANK, L. |
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Título: |
Asynchronous meiosis in an interspecific hybrid of Brachiaria ruziziensis and B. brizantha. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Plant Cell Reports, Berlin, v. 23, n. 5, p. 304 - 310, Nov. 2004. |
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Idioma: |
Inglês |
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Notas: |
CNPGC. |
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Conteúdo: |
Male meiosis is generally synchronous in higher plants. The regulation of the cell cycle is still not well understood, and a powerful tool for gaining an understanding of this regulation is the development of mutations that affect cell-cycle synchrony. We report here asynchronous microsporogenesis in an interspecific hybrid between two important tropical grasses. In young spikelets of the interspecific hybrid 49.10% of anther meiocytes entered meiosis, exhibiting typical phases of the first and second divisions, while the other 50.90% showed distinctive features of early prophase. In older spikelets, anthers containing mature pollen grains also displayed meiocytes still undergoing meiosis. At this time, the latter cells were enclosed by the exine wall. Despite asynchrony, all cells completed meiosis. Old anthers contained only pollen grains that appeared to be in the same stage of development. Pollen fertility was estimated to be 52.76% in dehiscent anthers. An independent genetic control for meiosis synchrony and meiotic stages is suggested. |
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Palavras-Chave: |
Cytology. |
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Thesagro: |
Brachiaria Brizantha; Brachiaria Ruziziensis; Citologia; Hibridação; Meiose; Melhoramento Genético Vegetal. |
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Thesaurus Nal: |
interspecific hybridization; meiosis; plant breeding. |
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Categoria do assunto: |
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Marc: |
LEADER 01882naa a2200289 a 4500
001 1325705
005 2007-08-31
008 2004 bl --- 0-- u #d
100 1 $aRISSO-PASCOTTO, C.
245 $aAsynchronous meiosis in an interspecific hybrid of Brachiaria ruziziensis and B. brizantha.
260 $c2004
500 $aCNPGC.
520 $aMale meiosis is generally synchronous in higher plants. The regulation of the cell cycle is still not well understood, and a powerful tool for gaining an understanding of this regulation is the development of mutations that affect cell-cycle synchrony. We report here asynchronous microsporogenesis in an interspecific hybrid between two important tropical grasses. In young spikelets of the interspecific hybrid 49.10% of anther meiocytes entered meiosis, exhibiting typical phases of the first and second divisions, while the other 50.90% showed distinctive features of early prophase. In older spikelets, anthers containing mature pollen grains also displayed meiocytes still undergoing meiosis. At this time, the latter cells were enclosed by the exine wall. Despite asynchrony, all cells completed meiosis. Old anthers contained only pollen grains that appeared to be in the same stage of development. Pollen fertility was estimated to be 52.76% in dehiscent anthers. An independent genetic control for meiosis synchrony and meiotic stages is suggested.
650 $ainterspecific hybridization
650 $ameiosis
650 $aplant breeding
650 $aBrachiaria Brizantha
650 $aBrachiaria Ruziziensis
650 $aCitologia
650 $aHibridação
650 $aMeiose
650 $aMelhoramento Genético Vegetal
653 $aCytology
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
700 1 $aJANK, L.
773 $tPlant Cell Reports, Berlin$gv. 23, n. 5, p. 304 - 310, Nov. 2004.
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Embrapa Gado de Corte (CNPGC) |
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| 7. |  | MEIRELES, E. J. L.; SILVA, S. C. da; ASSAD, E. D.; XAVIER, L. de S. Caracterização do risco climático na cultura do feijoeiro no Estado do Mato Grosso. In: CONGRESSO BRASILEIRO DE AGROMETEOROLOGIA, 10., 1997, Piracicaba, SP. Agrometeorologia, monitoramento ambiental e agricultura sustentável: anais. Piracicaba: Sociedade Brasileira de Agrometeorologia: ESALQ, 1997. p. 351-353.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| 15. | | SILVA, S. C. da; MEIRELES, E. J. L.; ASSAD, E. D.; XAVIER, L. de S.; CUNHA, M. A. C. da. Caracterização do risco climático para a cultura do arroz de terras altas no Estado de Mato Grosso. In: REUNIÃO NACIONAL DE PESQUISA DE ARROZ, 6., 1998, Goiânia, GO. Perspectivas para a cultura do arroz nos ecossistemas de várzeas e terras altas: painel, conferências e mesas-redondas. Santo Antônio de Goiás: Embrapa Arroz e Feijão, 1999. v. 2. p. 139-143. (Embrapa Arroz e Feijão. Documentos, 96).| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| Registros recuperados : 24 | |
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