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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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Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
09/04/1997 |
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Data da última atualização: |
14/09/2015 |
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Autoria: |
VASCONCELLOS, C. A.; FREIRE, F. M.; SANTOS, H. L. dos; PITTA, G. V. E.; ALVES, V. M. C. |
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Afiliação: |
VERA MARIA CARVALHO ALVES, CNPMS. |
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Título: |
Avaliação da disponibilidade de fósforo e adubação fosfatada para a cultura do milho. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
In: EMBRAPA. Centro de Nacional de Pesquisa de Milho e Sorgo. Relatório técnico anual do Centro Nacional de Pesquisa de Milho e Sorgo 1992-1993. Sete Lagoas, 1994. p. 218-219. |
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Idioma: |
Português |
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Palavras-Chave: |
Adubacao fosfatada; Disponibilidade; Maize; Phosphate. |
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Thesagro: |
Fósforo; Milho; Zea Mays. |
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Thesaurus NAL: |
fertilizers; phosphorus. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/80072/1/Avaliacao-disponibilidade.pdf
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Marc: |
LEADER 00873naa a2200265 a 4500
001 1474950
005 2015-09-14
008 1994 bl uuuu u00u1 u #d
100 1 $aVASCONCELLOS, C. A.
245 $aAvaliação da disponibilidade de fósforo e adubação fosfatada para a cultura do milho.$h[electronic resource]
260 $c1994
650 $afertilizers
650 $aphosphorus
650 $aFósforo
650 $aMilho
650 $aZea Mays
653 $aAdubacao fosfatada
653 $aDisponibilidade
653 $aMaize
653 $aPhosphate
700 1 $aFREIRE, F. M.
700 1 $aSANTOS, H. L. dos
700 1 $aPITTA, G. V. E.
700 1 $aALVES, V. M. C.
773 $tIn: EMBRAPA. Centro de Nacional de Pesquisa de Milho e Sorgo. Relatório técnico anual do Centro Nacional de Pesquisa de Milho e Sorgo 1992-1993. Sete Lagoas, 1994. p. 218-219.
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Embrapa Milho e Sorgo (CNPMS) |
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