| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Corte. |
|
Data corrente: |
10/08/2011 |
|
Data da última atualização: |
16/11/2011 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
RICCI, G. L.; KANESHIMA, A. M. de S.; PAGLIARINI, M. S.; VALLE, C. B. do. |
|
Afiliação: |
Gléia Laverde Ricci, UEM; Alice Maria de Souza-Kaneshima, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
|
Título: |
Meiotic behavior in Brachiaria humidicola (Poaceae) hybrids. |
|
Ano de publicação: |
2011 |
|
Fonte/Imprenta: |
Euphytica, v. 182, n. 3, p.355-361, Dec. 2011. |
|
Idioma: |
Inglês |
|
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 |
|
Thesagro: |
Brachiaria Humidicola; Melhoramento Genético Vegetal; Pastagem. |
|
Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
|
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.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Corte (CNPGC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 86 | |
| 6. |  | VALE, M. L. C. do; SCIVITTARO, W. B.; SOUSA, R. O. de; TEIXEIRA, D. A. Avaliação do efeito do NBPT sobre as perdas de nitrogênio por volatilização da amônia através dos parâmetros de um modelo logístico. In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS GRADUAÇÃO DA EMBRAPA CLIMA TEMPERADO, 3., 2010, Pelotas. resumos e palestras... Pelotas: Embrapa Clima Temperado, 2010. Anais: Carreira, ética e inovação: o que você está fazendo? Pelotas: Embrapa Clima Temperado, 2010. Editado por Ivan Rodrigues de Almeida, Leonardo Ferreira Dutra e Jamir Luis Silva da Silva. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
|   |
| 10. | | BAYER, C.; ZSCHORNACK, T.; CAMARGO, E.; SCIVITTARO, W. B.; SOUSA, R. O. de. Estratégias mitigadoras de emissão de gases do efeito estufa pela lavoura de arroz. In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 9., 2015, Pelotas. Ciência e tecnologia para otimização da orizicultura: anais. Brasília, DF: Embrapa; Pelotas: Sosbai, 2015.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
|  |
| 12. | | SILVA, V. T.; SILVA, G. T.; LUCAS, N. F.; SCIVITTARO, W. B.; SOUSA, R. O. DE. Potencial de aquecimento global de cultivares de arroz sob irrigação por inundação contínua e intermitente. In: SEMANA INTEGRADA UFPEL, 6.; CONGRESSO DE INICIAÇÃO CIENTÍFICA, 19., 2020, Pelotas. [Anais... Pelotas: UFPel, 2020.]. 4 p. CIC.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
| |
| 20. | | VEÇOZZI, T. A.; SOUSA, R. O. de; SCIVITTARO, W. B.; WEINERT, C.; TARRILLO, V. R. C. Soil solution and plant nitrogen on irrigated rice under controlled release nitrogen fertilizers. Ciência Rural, Santa Maria, v. 48, n. 1, p. 1-5, 2018.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Clima Temperado. |
| |
| Registros recuperados : 86 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
