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18. | | SILVA, V. A. da; TEIXEIRA, S. R.; BERNARDO, W. F. Reflexões sobre sucessão e identidade entre produtores de leite que visitaram a Embrapa Gado de Leite. In: CONGRESSO INTERNACIONAL DO LEITE, 8.; SIMPÓSIO SOBRE SUSTENTABILIDADE DA PECUÁRIA DE LEITE NO BRASIL, 10.; WORKSHOP SOBRE POLÍTICAS PÚBLICAS PARA O AGRONEGÓCIO DO LEITE, 8.; WORKSHOP DE QUALIDADE DO LEITE, 2., 2010, Juiz de Fora. Fórum das Américas: leite e derivados: anais. Juiz de Fora: Embrapa Gado de Leite, 2010. 1 CD-ROM. Biblioteca(s): Embrapa Gado de Leite. |
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Registros recuperados : 92 | |
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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. |
Registro Completo
Biblioteca(s): |
Embrapa Gado de Corte. |
Data corrente: |
30/09/2009 |
Data da última atualização: |
13/10/2009 |
Autoria: |
MENDES-BONATO, A. B.; RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do. |
Afiliação: |
ANDRÉA BEATRIZ MENDES-BONATO, UEM; CLAUDICÉIA RISSO-PASCOTTO, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
Título: |
Normal microspore production after cell fusion in Brachiaria jubata (Gramineae). |
Ano de publicação: |
2003 |
Fonte/Imprenta: |
Genetics and Molecular Biology, v.26, n. 4, p. 517-520, 2003. |
Idioma: |
Português |
Conteúdo: |
Cytogenetic studies were carried out on 22 accessions of Brachiaria jubata from the Embrapa Beef Cattle Brachiaria collection. One accession was diploid (2n = 2x = 18) and the remaining 21 were tetraploid (2n = 4x = 36). Among five tetraploid accessions, a specific and constant pattern of cell fusion involving only two microsporocytes was recorded. Meiosis proceeded normally from prophase I to the end, giving rise to an octad with normal microspores that developed into fertile pollen grains. Regular octad formation was possible because each cellular chromosome set was maintained in its proper domain, spindles were correctly positioned, and cytokinesis planes were formed in the correct places. Such behavior of meiosis in syncytes has never been reported in any other plant species. |
Palavras-Chave: |
Brachiaria jubata; Braquiária; Microsporogênese. |
Thesagro: |
Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
Marc: |
LEADER 01468naa a2200229 a 4500 001 1512797 005 2009-10-13 008 2003 bl --- 0-- u #d 100 1 $aMENDES-BONATO, A. B. 245 $aNormal microspore production after cell fusion in Brachiaria jubata (Gramineae). 260 $c2003 520 $aCytogenetic studies were carried out on 22 accessions of Brachiaria jubata from the Embrapa Beef Cattle Brachiaria collection. One accession was diploid (2n = 2x = 18) and the remaining 21 were tetraploid (2n = 4x = 36). Among five tetraploid accessions, a specific and constant pattern of cell fusion involving only two microsporocytes was recorded. Meiosis proceeded normally from prophase I to the end, giving rise to an octad with normal microspores that developed into fertile pollen grains. Regular octad formation was possible because each cellular chromosome set was maintained in its proper domain, spindles were correctly positioned, and cytokinesis planes were formed in the correct places. Such behavior of meiosis in syncytes has never been reported in any other plant species. 650 $aGramínea Forrageira 650 $aMelhoramento Genético Vegetal 650 $aPastagem 653 $aBrachiaria jubata 653 $aBraquiária 653 $aMicrosporogênese 700 1 $aRISSO-PASCOTTO, C. 700 1 $aPAGLIARINI, M. S. 700 1 $aVALLE, C. B. do 773 $tGenetics and Molecular Biology$gv.26, n. 4, p. 517-520, 2003.
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Embrapa Gado de Corte (CNPGC) |
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