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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
10/08/2011 |
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Data da última atualização: |
16/11/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
RICCI, G. L.; KANESHIMA, A. M. de S.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
Gléia Laverde Ricci, UEM; Alice Maria de Souza-Kaneshima, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic behavior in Brachiaria humidicola (Poaceae) hybrids. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Euphytica, v. 182, n. 3, p.355-361, Dec. 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
In the genus Brachiaria, genetic variation can be exploited directly from germplasm collections or released using sexual reproduction in normally apomictic polyploids. The discovery of a natural sexual polyploid accession H031 of Brachiaria humidicola collected in Africa, opened new opportunities to exploit the genetic variation in this species. This accession was crossed with an apomictic cultivar BRS Tupi with the same chromosome number (2n = 36) and 361 F1 hybrids were obtained. Following visual selection for leafiness, vigor, growth habit, and the mode of reproduction, 50 hybrids were selected for further agronomic evaluation. The parents and 45 of the 50 selected hybrids were evaluated for the regularity of meiosis. In the female parent (H031), meiosis was somewhat irregular, with 16.3% of abnormal tetrads, whereas the male (cv. BRS Tupi) meiosis was very regular, with only 3.1% of abnormal tetrads. Among hybrids (sexual and apomictic), the percentage of abnormal tetrads ranged from 15.8 to 98.3%. The abnormalities included irregular chromosome segregation, chromosome stickiness and the absence of cytokinesis. Considering that apomixis in the genus Brachiaria is pseudogamic, and that meiotic aberrations can compromise pollen viability, the results of this study present another parameter to aid selection for more stable microsporogenesis. Apomictic derivatives with stable meiosis are candidates for new cultivars whereas sexual hybrids can be retained in breeding for another round of recombination. MenosIn the genus Brachiaria, genetic variation can be exploited directly from germplasm collections or released using sexual reproduction in normally apomictic polyploids. The discovery of a natural sexual polyploid accession H031 of Brachiaria humidicola collected in Africa, opened new opportunities to exploit the genetic variation in this species. This accession was crossed with an apomictic cultivar BRS Tupi with the same chromosome number (2n = 36) and 361 F1 hybrids were obtained. Following visual selection for leafiness, vigor, growth habit, and the mode of reproduction, 50 hybrids were selected for further agronomic evaluation. The parents and 45 of the 50 selected hybrids were evaluated for the regularity of meiosis. In the female parent (H031), meiosis was somewhat irregular, with 16.3% of abnormal tetrads, whereas the male (cv. BRS Tupi) meiosis was very regular, with only 3.1% of abnormal tetrads. Among hybrids (sexual and apomictic), the percentage of abnormal tetrads ranged from 15.8 to 98.3%. The abnormalities included irregular chromosome segregation, chromosome stickiness and the absence of cytokinesis. Considering that apomixis in the genus Brachiaria is pseudogamic, and that meiotic aberrations can compromise pollen viability, the results of this study present another parameter to aid selection for more stable microsporogenesis. Apomictic derivatives with stable meiosis are candidates for new cultivars whereas sexual hybrids can be retained in breeding for anot... Mostrar Tudo |
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Thesagro: |
Brachiaria Humidicola; Melhoramento Genético Vegetal; Pastagem. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02093naa a2200193 a 4500
001 1897754
005 2011-11-16
008 2011 bl uuuu u00u1 u #d
100 1 $aRICCI, G. L.
245 $aMeiotic behavior in Brachiaria humidicola (Poaceae) hybrids.$h[electronic resource]
260 $c2011
520 $aIn the genus Brachiaria, genetic variation can be exploited directly from germplasm collections or released using sexual reproduction in normally apomictic polyploids. The discovery of a natural sexual polyploid accession H031 of Brachiaria humidicola collected in Africa, opened new opportunities to exploit the genetic variation in this species. This accession was crossed with an apomictic cultivar BRS Tupi with the same chromosome number (2n = 36) and 361 F1 hybrids were obtained. Following visual selection for leafiness, vigor, growth habit, and the mode of reproduction, 50 hybrids were selected for further agronomic evaluation. The parents and 45 of the 50 selected hybrids were evaluated for the regularity of meiosis. In the female parent (H031), meiosis was somewhat irregular, with 16.3% of abnormal tetrads, whereas the male (cv. BRS Tupi) meiosis was very regular, with only 3.1% of abnormal tetrads. Among hybrids (sexual and apomictic), the percentage of abnormal tetrads ranged from 15.8 to 98.3%. The abnormalities included irregular chromosome segregation, chromosome stickiness and the absence of cytokinesis. Considering that apomixis in the genus Brachiaria is pseudogamic, and that meiotic aberrations can compromise pollen viability, the results of this study present another parameter to aid selection for more stable microsporogenesis. Apomictic derivatives with stable meiosis are candidates for new cultivars whereas sexual hybrids can be retained in breeding for another round of recombination.
650 $aBrachiaria Humidicola
650 $aMelhoramento Genético Vegetal
650 $aPastagem
700 1 $aKANESHIMA, A. M. de S.
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tEuphytica$gv. 182, n. 3, p.355-361, Dec. 2011.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 617 | |
| 170. |  | ROCHA, M. da; CHIARI, L.; SALGADO, L. R.; VALLE, C. B. do; DOURADO, D. M. Caracterização molecular de acessos de Brachiaria spp. usando RAPD. In: SILVEIRA, A. B. da.; DOURADO, D. M.; ANDRADE, L. P. de.; GERVÁSIO, M. S. P.; RIOS, R. A. G. M.; MATIAS, R. (Org.). Bio(in)formação: produção do curso de Ciências Biológicas 2011. Campo Grande, MS: Ed. Anhanguera Uniderp, 2011. p. 291-304 Trabalho 18.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 171. | | ROCHA, M. da; CHIARI, L.; VALLE, C. B. do; SALGADO, L. R.; LEGUIZAMON, G. O. C. Caracterização molecular de acessos de Brachiaria spp. usando RAPD. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 2., 2006, Campo Grande, MS. Anais [da]... 2. ed. Campo Grande, MS: Embrapa Gado de Corte, 2006. 1 p. 1 CD-ROM. CNPGC.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 174. | | VALÉRIO, J. R.; BARBOSA, L. R.; VALLE, C. B. do; RABAIOLLI, M.; OLIVEIRA, M. C. M. Screening Brachiaria hybrids for resistance to the pasture spittlebug Notozulia entreriana (Berg, 1879) (Hemiptera : Cercopidae) in central Brazil. In: INTERNATIONAL GRASSLAND CONGRESS, 21.; INTERNATIONAL RANGELAND CONGRESS, 8., 2008, Huhhot, China. Multifunctional grasslands in a changing world: proceedings. Guangzhou: Guangdong People´s Publishing House, 2008. v. 2. p. 394.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Gado de Corte. |
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| 175. | | VALÉRIO, J. R.; BARBOSA, L. R.; VALLE, C. B. do; RABAIOLLI, M.; OLIVEIRA, M. C. M. Screening Brachiaria hybrids for resistance to the pasture spittlebug Notozulia entreriana (Berg, 1879) (Hemiptera:Cercopidae) in central Brazil. In: INTERNATIONAL GRASSLAND CONGRESS, 21.; INTERNATIONAL RANGELAND CONGRESS, 8., 2008, Hohhot, China. Multifunctional grasslands in a changing world. Guangzhou: Guangdong People´s Publ., 2008. v. 2, p. 394.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Florestas. |
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| 178. | | CHIARI, L.; BITENCOURT, G. de A.; VALLE, C. B. do; JANK, L. Extração de RNA de folhas e raízes de Brachiaria decumbens e Panicum maximum 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. 163-166 1 CD-ROM| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| Registros recuperados : 617 | |
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