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| 122. |  | JANK, L.; VALLE, C. B. do; RESENDE, R. M. S. Novas alternativas forrageiras para pastagens tropicais. In: CONGRESSO INTERNACIONAL DE ZOOTECNIA, 7.; CONGRESSO NACIONAL DE ZOOTECNIA, 10.; REUNIÃO NACIONAL DE ENSINO DE ZOOTECNIA, 11.; FÓRUM DE ENTIDADES DE ZOOTECNIA, 28.; FÓRUM DE COORDENADORES DE CURSOS DE ZOOTECNIA DAS UNIVERSIDADES BRASILEIRAS, 1., 2005, Campo Grande, MS. Produção animal e responsabilidade: [anais]. Campo Grande, MS: ABZ: UEMS: UFMS: CPAP: MAPA, 2005. Zootec 2005 15 p. 1 CD-ROM. Zootec 2005.| Biblioteca(s): Embrapa Gado de Corte. |
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| 137. | | FELISMINO, M. F.; PAGLIARINI, M. S.; VALLE, C. B. do; RESENDE, R. M. S. Meiotic stability in two pre-selected and promising interspecific Brachiaria (Poaceae) hybrids. In: INTERNATIONAL SYMPOSIUM ON FORAGE BREEDING, 3., 2011, Bonito, MS. Breeding forage for climate change adaptation and mitigation - eco-efficient animal produtction: proceedings. [Campo Grande, MS: Embrapa Gado de Corte], 2011. 184-187 1 CD-ROM| Biblioteca(s): Embrapa Gado de Corte. |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Gado de Corte. |
|
Data corrente: |
04/01/2005 |
|
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: |
-- |
|
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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