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| Registros recuperados : 24 | |
| 14. |  | PAGLIARINI, M. S.; RISSO-PASCOTTO, C.; SOUZA-KANESHIMA, A. M. de; VALLE, C. B. do. Analysis of meiotic behavior in selecting potential genitors among diploid and artifcially induced tetraploid accessions of Brachiaria ruziziensis (Poaceae). Euphytica, Wageningen, Holanda, v. 164, n.1 , p. 181-187, nov. 2008.| Biblioteca(s): Embrapa Gado de Corte. |
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| 20. | | BOLDRINI, K. R.; MICHELETTI, P. L.; RISSO-PASCOTTO, C.; ADAMOWSKI, E. V.; PAGLIARINI, M. S.; VALLE, C. B. Um novo mecanismo de formação de gametas 2n em Brachiaria (POACEAE). In: CONGRESSO BRASILEIRO DE GENÉTICA, 51., 2005, Águas de Lindóia. Da Bioestatística à Bioinformática - a era da Genômica: [anais]. Águas de Lindóia: Sociedade Brasileira de Genética, 2005. p. 523 1 CD-ROM.| Biblioteca(s): Embrapa Gado de Corte. |
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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
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
10/07/2009 |
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Data da última atualização: |
20/07/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MENDES-BONATO, A. B.; RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
ANDREA BEATRIZ MENDES-BONATO, UNIVERSIDADE ESTADUAL DE MARINGÁ; CLAUDICÉIA RISSO-PASCOTTO, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Chromosome number and meiotic behaviour in Brachiaria jubata (Gramineae). |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Journal of Genetics, Bangalore, v. 85, n. 1, p. 83-87, Apr. 2006. |
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Idioma: |
Inglês |
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Notas: |
Research note. |
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Conteúdo: |
The production of new genetic variability through hybridization has been undertaken in Brachiaria, an important forage grass genus of African origin widely used in pastures in the Brazilian tropics. Although the genus comprises about 100 species, only a few of them present favourable agronomic attributes and are explored. In the genus Brachiaria, the majority of species and accessions are polyploid and apomictic, which makes breeding through hybridization more complex. Sexuality has been found in diploids and eventually among tetraploids with normal meiosis. Brachiaria jubata presents good forage value and adaptation to riverbanks and lake margins, and is therefore relevant to pasture systems in the tropics. Furthermore, the most interesting form of resistance to spittlebugs?antibiosis?was identified in one accession of B. jubata. Thus its interest in the Brazilian breeding programme lies in the possibility of using hybridization to transfer high resistance to this insect to susceptible accessions. This paper reports chromosome numbers and meiotic behaviour in 21 accessions of this species as a tool in selecting promising ones for crossing. Only one accession was found to be diploid; the others were tetraploid. Microsporogenesis was normal in the diploid accession, while among the tetraploid ones, irregular chromosome segregation leading to unbalanced gamete formation was common but variable. Pollen fertility among tetraploid accessions was high. |
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Palavras-Chave: |
Brachiaria jubata; Braquiária. |
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Thesagro: |
Citogenética; Gramínea Forrageira; Meiose; Melhoramento Genético Vegetal; Pastagem; Poliploidia. |
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Thesaurus NAL: |
Chromosome number; Meiosis; Microsporogenesis. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02315naa a2200301 a 4500
001 1327023
005 2023-07-20
008 2006 bl uuuu u00u1 u #d
100 1 $aMENDES-BONATO, A. B.
245 $aChromosome number and meiotic behaviour in Brachiaria jubata (Gramineae).
260 $c2006
500 $aResearch note.
520 $aThe production of new genetic variability through hybridization has been undertaken in Brachiaria, an important forage grass genus of African origin widely used in pastures in the Brazilian tropics. Although the genus comprises about 100 species, only a few of them present favourable agronomic attributes and are explored. In the genus Brachiaria, the majority of species and accessions are polyploid and apomictic, which makes breeding through hybridization more complex. Sexuality has been found in diploids and eventually among tetraploids with normal meiosis. Brachiaria jubata presents good forage value and adaptation to riverbanks and lake margins, and is therefore relevant to pasture systems in the tropics. Furthermore, the most interesting form of resistance to spittlebugs?antibiosis?was identified in one accession of B. jubata. Thus its interest in the Brazilian breeding programme lies in the possibility of using hybridization to transfer high resistance to this insect to susceptible accessions. This paper reports chromosome numbers and meiotic behaviour in 21 accessions of this species as a tool in selecting promising ones for crossing. Only one accession was found to be diploid; the others were tetraploid. Microsporogenesis was normal in the diploid accession, while among the tetraploid ones, irregular chromosome segregation leading to unbalanced gamete formation was common but variable. Pollen fertility among tetraploid accessions was high.
650 $aChromosome number
650 $aMeiosis
650 $aMicrosporogenesis
650 $aCitogenética
650 $aGramínea Forrageira
650 $aMeiose
650 $aMelhoramento Genético Vegetal
650 $aPastagem
650 $aPoliploidia
653 $aBrachiaria jubata
653 $aBraquiária
700 1 $aRISSO-PASCOTTO, C.
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tJournal of Genetics, Bangalore$gv. 85, n. 1, p. 83-87, Apr. 2006.
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