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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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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 : 7 | |
| 2. |  | STECCA, C. S.; BUENO, A. de F.; PASINI, A.; SILVA, D. M.; ANDRADE, K.; FILHO, D. M. Z. Side-Effects of Glyphosate to the Parasitoid Telenomus remus Nixon (Hymenoptera: Platygastridae). Neotropical entomology, v. 45, n. 2, p. 192-200, 2016.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Soja. |
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| 3. | | STECCA, C. S.; ZIRONDI, D.; MANTOVANI, M. A.; FRANÇA, L. F. T.; SILVA, D. M.; PASINI, A.; BUENO, A. F. Seletividade de inseticidas reguladores de crescimento a adultos de Podisus nigrispinus em laboratório. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 24., 2012, Curitiba. SEB-40 anos de avanços da Ciência Entomológica Brasileira: anais. [Curitiba]: SEB, 2012. Disponível em: <http://www.cbe2012.com.br/_apps/anais_web/trabalhos_selecionar.php>.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 4. | | SILVA, D. M.; BUENO, A. F.; FRANÇA, L. F. T. de; MANTOVANI, M. A. M.; STECCA, C. S.; MOSCARDI, F.; MARTINELLI, S. Diferentes fontes alimentares na preferência de oviposição de Spodoptera frugiperda (Lepidoptera: noctuidae). In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 24., 2012, Curitiba. SEB-40 anos de avanços da Ciência Entomológica Brasileira: anais. [Curitiba]: SEB, 2012.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 5. | | SILVA, D. M.; BUENO, A. F.; FRANÇA, L. F. T.; MANTOVANI, M. A. M.; STECCA, C. S.; LEITE, N.; OLIVEIRA, M. C. N. de; MOSCARDI, F. Biologia e preferência alimentar de spodoptera frugiperda (Lepidoptera: noctuidae) em diferentes fontes hospedeiras. In: CONGRESSO BRASILEIRO DE SOJA, 6., 2012, Cuiabá. Soja: integração nacional e desenvolvimento sustentável: resumos. Brasília, DF: Embrapa, 2012. p. 47, res. 61.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 6. | | SILVA, D. M.; BUENO, A. F.; MANTOVANI, M. A. M.; FRANÇA, L. F. T. de; STECCA, C. S.; MOSCARDI, F.; MARTINELLI, S. Preferência de oviposição de Spodoptera eridania (Lepidoptera: Noctuidae). In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 24., 2012, Curitiba. SEB-40 anos de avanços da Ciência Entomológica Brasileira: anais. [Curitiba]: SEB, 2012. Disponível em: <http://www.cbe2012.com.br/_apps/anais_web/trabalhos_selecionar.php>.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| 7. | | STECCA, C. S.; MANTOVANI, M. A.; FRANÇA, L. F. T.; SILVA, D. M.; DENEZ, M. M.; PASINI, A.; BUENO, A. de F. Seletividade de inseticidas inibidores de processos metabólicos a adultos de Podisus nigrispinus em laboratório. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 24., 2012, Curitiba. SEB-40 anos de avanços da Ciência Entomológica Brasileira: anais. [Curitiba]: SEB, 2012. Disponível em: <http://www.cbe2012.com.br/_apps/anais_web/trabalhos_selecionar.php>.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Soja. |
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| Registros recuperados : 7 | |
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