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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
01/02/2010 |
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Data da última atualização: |
01/02/2010 |
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Tipo da produção científica: |
Artigo em Anais de Congresso / Nota Técnica |
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Autoria: |
FUZINATTO, V. A.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
VERIDIANA APARECIDA FUZINATTO, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic behavior in progenies from a hybrid between B. ruziziensis and B. brizantha (Poaceae). |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
In:SIMPÓSIO INTERNACIONAL SOBRE MELHORAMENTO DE FORRAGEIRAS, 2., 2009, Campo Grande, MS. [Anais]... Campo Grande, MS: Embrapa Gado de Corte, 2009. II SIMF. Comitê editorial: Liana Jank; Lucimara Chiari; Rosângela Maria Simeão Resende. |
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Páginas: |
3 p. |
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Descrição Física: |
1 CD-ROM. |
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Idioma: |
Inglês |
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Notas: |
Resumo C 07. |
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Conteúdo: |
In the last three decades, the extensive use of some Brachiaria cultivars created directly from the natural genetic variability has placed Brazil as the major beef cattle exporter in the world. Interspecific hybridization is difficult to accomplish because only a few species are compatible (VALLE; SAVIDAN, 1996; VALLE; PAGLIARINI, 2009). Compatibility has been found among some species of the Group 5 (RENVOIZE et al., 1996): B. brizantha, B. decumbens and B. ruziziensis. Due to correlation between polyploidy and apomixis, Brachiaria breeding is not easy. Polyploid accessions with desirable agronomic characteristics are apomictics (VALLE; SAVIDAN, 1996), and sexuality is found only in diploid accessions. To overcome the barrier between sexual diploid and apomictic tetraploid accessions, Ferguson and Crowder (1974) proposed to create a cross-compatible, sexual tetraploid plant by doubling the chromosome number. The barrier was overcome a decade later, in Belgium, when diploid accessions of B. ruziziensis were tetraploidized with colchicine (SWENNE et al., 1981). In the genus Brachiaria, apomixis is pseudogamic, which means that viable gametes are necessary to fertilize the secondary nucleus of the embryo sac to guarantee endosperm development to produce healthy seeds (VALLE; SAVIDAN, 1996). But, in the genus, polyploidy is highly correlated with abnormal meiosis (MENDES-BONATO et al., 2002a; RISSOPASCOTTO et al., 2006). Previous cytogenetic analysis of F1 generations of B. ruziziensis x B. brizantha hybrids (RISSO-PASCOTTO et al., 2005) have been conducted and revealed that they differ in amount and kinds of meiotic abnormalities, indicating that selection for meiotic stability is possible among them. In this study, we analyzed for the first time, the microsporogenesis of six progenies of a crossing between a sexual tetraploidized accession of B. ruziziensis and a natural tetraploid of B. brizantha, in attempt to select apomictic progenies with high meiotic stability and high seed production to be released as new cultivars. MenosIn the last three decades, the extensive use of some Brachiaria cultivars created directly from the natural genetic variability has placed Brazil as the major beef cattle exporter in the world. Interspecific hybridization is difficult to accomplish because only a few species are compatible (VALLE; SAVIDAN, 1996; VALLE; PAGLIARINI, 2009). Compatibility has been found among some species of the Group 5 (RENVOIZE et al., 1996): B. brizantha, B. decumbens and B. ruziziensis. Due to correlation between polyploidy and apomixis, Brachiaria breeding is not easy. Polyploid accessions with desirable agronomic characteristics are apomictics (VALLE; SAVIDAN, 1996), and sexuality is found only in diploid accessions. To overcome the barrier between sexual diploid and apomictic tetraploid accessions, Ferguson and Crowder (1974) proposed to create a cross-compatible, sexual tetraploid plant by doubling the chromosome number. The barrier was overcome a decade later, in Belgium, when diploid accessions of B. ruziziensis were tetraploidized with colchicine (SWENNE et al., 1981). In the genus Brachiaria, apomixis is pseudogamic, which means that viable gametes are necessary to fertilize the secondary nucleus of the embryo sac to guarantee endosperm development to produce healthy seeds (VALLE; SAVIDAN, 1996). But, in the genus, polyploidy is highly correlated with abnormal meiosis (MENDES-BONATO et al., 2002a; RISSOPASCOTTO et al., 2006). Previous cytogenetic analysis of F1 generations of B. ruz... Mostrar Tudo |
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Palavras-Chave: |
Braquiária. |
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Thesagro: |
Brachiaria Brizantha; Brachiaria Ruziziensis; Gramínea Forrageira; 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 02956naa a2200241 a 4500
001 1631869
005 2010-02-01
008 2009 bl uuuu u00u1 u #d
100 1 $aFUZINATTO, V. A.
245 $aMeiotic behavior in progenies from a hybrid between B. ruziziensis and B. brizantha (Poaceae).
260 $c2009
300 $a3 p.$c1 CD-ROM.
500 $aResumo C 07.
520 $aIn the last three decades, the extensive use of some Brachiaria cultivars created directly from the natural genetic variability has placed Brazil as the major beef cattle exporter in the world. Interspecific hybridization is difficult to accomplish because only a few species are compatible (VALLE; SAVIDAN, 1996; VALLE; PAGLIARINI, 2009). Compatibility has been found among some species of the Group 5 (RENVOIZE et al., 1996): B. brizantha, B. decumbens and B. ruziziensis. Due to correlation between polyploidy and apomixis, Brachiaria breeding is not easy. Polyploid accessions with desirable agronomic characteristics are apomictics (VALLE; SAVIDAN, 1996), and sexuality is found only in diploid accessions. To overcome the barrier between sexual diploid and apomictic tetraploid accessions, Ferguson and Crowder (1974) proposed to create a cross-compatible, sexual tetraploid plant by doubling the chromosome number. The barrier was overcome a decade later, in Belgium, when diploid accessions of B. ruziziensis were tetraploidized with colchicine (SWENNE et al., 1981). In the genus Brachiaria, apomixis is pseudogamic, which means that viable gametes are necessary to fertilize the secondary nucleus of the embryo sac to guarantee endosperm development to produce healthy seeds (VALLE; SAVIDAN, 1996). But, in the genus, polyploidy is highly correlated with abnormal meiosis (MENDES-BONATO et al., 2002a; RISSOPASCOTTO et al., 2006). Previous cytogenetic analysis of F1 generations of B. ruziziensis x B. brizantha hybrids (RISSO-PASCOTTO et al., 2005) have been conducted and revealed that they differ in amount and kinds of meiotic abnormalities, indicating that selection for meiotic stability is possible among them. In this study, we analyzed for the first time, the microsporogenesis of six progenies of a crossing between a sexual tetraploidized accession of B. ruziziensis and a natural tetraploid of B. brizantha, in attempt to select apomictic progenies with high meiotic stability and high seed production to be released as new cultivars.
650 $aBrachiaria Brizantha
650 $aBrachiaria Ruziziensis
650 $aGramínea Forrageira
650 $aMelhoramento Genético Vegetal
650 $aPastagem
653 $aBraquiária
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tIn:SIMPÓSIO INTERNACIONAL SOBRE MELHORAMENTO DE FORRAGEIRAS, 2., 2009, Campo Grande, MS. [Anais]... Campo Grande, MS: Embrapa Gado de Corte, 2009. II SIMF. Comitê editorial: Liana Jank; Lucimara Chiari; Rosângela Maria Simeão Resende.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Registros recuperados : 617 | |
| 102. |  | JANK, L.; VALLE, C. B. do; RESENDE, R. M. S. Novas alternativas forrageiras para pastagens tropicais. In: CONGRESSO INTERNACIONAL DE ZOOTECNIA, 7.; CONGRESSO NACIONAL DE ZOOTECNIA, 10.; REUNIÃO NACIONAL DE ENSINO DE ZOOTECNIA, 11.; FÓRUM DE ENTIDADES DE ZOOTECNIA, 28.; FÓRUM DE COORDENADORES DE CURSOS DE ZOOTECNIA DAS UNIVERSIDADES BRASILEIRAS, 1., 2005, Campo Grande, MS. Produção animal e responsabilidade: [anais]. Campo Grande, MS: ABZ: UEMS: UFMS: CPAP: MAPA, 2005. Zootec 2005 15 p. 1 CD-ROM. Zootec 2005.| Biblioteca(s): Embrapa Gado de Corte. |
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| 108. | | MILES, J. W.; MAASS, B. L.; VALLE, C. B. do. Reports of working groups. In: MILES, J.W.; MAASS, B.L.; VALLE, C.B. do, ed. Brachiaria: biology, agronomy and improvement. Cali: CIAT / Brasilia: EMBRAPA-CNPGC, 1996. p.272-277. (CIAT.Publication, 259). CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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| 118. | | PEIXOTO, L. T.; VALLE, C. B. do; RESENDE, R. M. S. Avaliação agronômica de híbridos de Brachiaria humidicola. In: JORNADA CIENTÍFICA DA EMBRAPA GADO DE CORTE, 4., 2008, Campo Grande, MS. Anais [da]... Campo Grande, MS: Embrapa Gado de Corte, 2008. 1 CD-ROM. Editores técnicos Valdemir Antônio Laura, Paulo Henrique Nogueira Biscola. 2 p. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Gado de Corte. |
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| Registros recuperados : 617 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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