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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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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: |
null
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 3 | |
| 1. |  | QUEIROZ, V. T.; GUIMARAES, C. T.; ANHERT, D.; MOTAS, J. W. S.; PEREIRA, M. G.; DAHER, R. F.; MIRANDA, V. R. M.; BARROS, E. G.; MOREIRA, M. A. Mapping of major QTLs associated with witches broom resistance in cocoa. Genetics and Molecular Biology, Ribeirão Preto, v. 23, n. 3, p. 227, 2000. Edição dos resumos do 46º Congresso Nacional de Genética, Águas de Lindóia, SP, 2000.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 2. | | GUIMARAES, C. T.; QUEIROZ, V. T.; MOTA. J. W. S.; PEREIRA, M. G.; DAHER, R. F.; MIRANDA, V. R. M.; ANHERT, D.; BARROS, E. G.; MOREIRA, M. A. A cocoa genetic linkage map and QTL detection for witches broom resistance. In: INTERNATIONAL CONFERENCE ON THE STATUS OF PLANT & ANIMAL GENOME RESEARCH, 7., 1999, San Diego. Final program & abstracts guide. New York: SCHERAGO International, 1999. p. 194.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| 3. | | QUEIROZ, V. T.; GUIMARAES, C. T.; ANHERT, D.; SCHUSTER, I.; DAHER, R. T.; PEREIRA, M. G.; MIRANDA, V. R. M; LOGUERCIO, L. L.; BARROS, E. G.; MOREIRA, M. A. Identification of a major QTL in cocoa (Theobroma cacao L.) associated with resistance to witches' broom disease. Plant Breeding, Berlin, v. 122, n. 3, p. 268-272, 2003.| Tipo: Artigo em Periódico Indexado |
| Biblioteca(s): Embrapa Milho e Sorgo. |
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| Registros recuperados : 3 | |
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