| |
|
|
| Registros recuperados : 172 | |
| 4. |  | VALLE, C. B. do; PAGLIARINI, M. S. Biology, cytogenetics, and breeding of Brachiaria. In: SINGH, R. J. (Ed.). Genetic resources, chromosome engineering, and crop improvement: forage crops. Boca Raton: CRC, 2009. (Genetic resources, chromosome engineering, and crop improvement series; v. 5). p. 104-151.| Biblioteca(s): Embrapa Gado de Corte. |
|   |
| 8. | | PAGLIARINI, M. S.; FUZINATTO, V. A.; VALLE, C. B. do. Comportamento meiótico de progênies híbridas do gênero Brachiaria (Poaceae). In: CONGRESSO BRASILEIRO DE MELHORAMENTO DE PLANTAS, 5., 2009, Guarapari. O melhoramento e os novos cenários da agricultura: anais. Vitória: Incaper, 2009. 1 CD-ROM. (Incaper. Documentos, 11). CBMP 2009. Organizado por Romário Gava Ferrão, Frederico de Pina Matta, Maria Amélia Gava Ferrão, João Cândido de Souza, Adelaide de F. S. da Costa, Liliâm Maria Ventorim Ferrão. 4 p. 1 CD-ROM.| Biblioteca(s): Embrapa Gado de Corte. |
| |
| Registros recuperados : 172 | |
|
|
|
 | 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: |
BOLDRINI, K. R.; PAGLIARINI, M. S.; VALLE, C. B. D. |
|
Afiliação: |
K. R. BOLDRINI, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
|
Título: |
Cell fusion and cytomixis during microsporogenesis in Brachiaria humidicola (Poaceae). |
|
Ano de publicação: |
2006 |
|
Fonte/Imprenta: |
South African Journal of Botany, v.72, p.478-481, 2006. Issue 3. Short Communication. |
|
Idioma: |
Português |
|
Conteúdo: |
During cytological analysis of microsporogenesis in 28 polyploid accessions of Brachiaria humidicola (Poaceae) from the Embrapa Beef
Cattle germplasm collection for breeding purposes, cell fusions were recorded in two accessions and chromosome transfer among meiocytes in
one of them. Cell fusion between two to more than ten cells was recorded from prophase I to telophase II. In the syncyte, each nucleus maintained its integrity. In one of these accessions, cytomixis with characteristics never reported in any other plant species was recorded. It occurred among very small meiocytes that transferred the entire genome or part of it to normal meiocytes. Chromosome transfer occurred preferentially during telophase I and, during migration, chromatin showed structural alteration. Both abnormalities compromise pollen fertility. In the Brachiaria genus, polyploid accessions are, in general, apomictic, albeit pseudogamous. Consequently, fertile pollen is essential to fertilize the central nucleus of the embryo sac and ensure viable seeds production. Thus, accessions with high frequencies of meiotic abnormalities might be eliminated early from the breeding program. |
|
Palavras-Chave: |
Braquiária; Microsporogênese. |
|
Thesagro: |
Brachiaria Humidicola; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem. |
|
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
|
Marc: |
LEADER 01843naa a2200217 a 4500
001 1512791
005 2009-10-13
008 2006 bl --- 0-- u #d
100 1 $aBOLDRINI, K. R.
245 $aCell fusion and cytomixis during microsporogenesis in Brachiaria humidicola (Poaceae).
260 $c2006
520 $aDuring cytological analysis of microsporogenesis in 28 polyploid accessions of Brachiaria humidicola (Poaceae) from the Embrapa Beef Cattle germplasm collection for breeding purposes, cell fusions were recorded in two accessions and chromosome transfer among meiocytes in one of them. Cell fusion between two to more than ten cells was recorded from prophase I to telophase II. In the syncyte, each nucleus maintained its integrity. In one of these accessions, cytomixis with characteristics never reported in any other plant species was recorded. It occurred among very small meiocytes that transferred the entire genome or part of it to normal meiocytes. Chromosome transfer occurred preferentially during telophase I and, during migration, chromatin showed structural alteration. Both abnormalities compromise pollen fertility. In the Brachiaria genus, polyploid accessions are, in general, apomictic, albeit pseudogamous. Consequently, fertile pollen is essential to fertilize the central nucleus of the embryo sac and ensure viable seeds production. Thus, accessions with high frequencies of meiotic abnormalities might be eliminated early from the breeding program.
650 $aBrachiaria Humidicola
650 $aGramínea Forrageira
650 $aMelhoramento Genético Vegetal
650 $aPastagem
653 $aBraquiária
653 $aMicrosporogênese
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. D.
773 $tSouth African Journal of Botany$gv.72, p.478-481, 2006. Issue 3. Short Communication.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Corte (CNPGC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
