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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
30/07/2008 |
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Data da última atualização: |
25/07/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ADAMOWSKI, E. de V.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
ELENIZA DE VICTOR ADAMOWSKI, UNIVERSIDADE ESTADUAL DE MARINGÁ; MARIA SUELY PAGLIARINI, UNIVERSIDADE ESTADUAL DE MARINGÁ; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
Meiotic behaviour in three interspecific three-way hybrids between Brachiaria ruziziensis and B. brizantha (Poaceae: Paniceae). |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Journal of Genetics, Bangalore, v. 87, n. 1, p. 33-38, Apr. 2008. |
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Idioma: |
Inglês |
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Notas: |
Research article. |
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Conteúdo: |
The meiotic behaviour of three three-way interspecific promising hybrids (H17, H27, and H34) was evaluated. These hybrids resulted from the crosses between B. ruziziensis × B. brizantha and crossed to another B. brizantha. Two half-sib hybrids (H27 and H34) presented an aneuploid chromosome number (2n = 4x = 33), whereas hybrid H17 was a tetraploid (2n = 4x = 36), as expected. Chromosome paired predominantly as multivalents suggesting that genetic recombination and introgression of specific target genes from B. brizantha into B. ruziziensis can be expected. Arrangement of parental genomes in distinct metaphase plates was observed in H27 and H34, which have different male genitors. Hybrids H17 and H34 have the same male genitor, but did not display this abnormality. In H17, abnormalities were more frequent from anaphase II, when many laggard chromosomes appeared, suggesting that each genome presented a different genetic control for meiotic phase timing. Despite the phylogenetic proximity among these two species, these three hybrids presented a high frequency of meiotic abnormalities, mainly those related to irregular chromosome segregation typical of polyploids, H34, 69.1%; H27, 56.1% and H17, 44.9%. From the accumulated results obtained through cytological studies in Brachiaria hybrids, it is evident that cytogenetical analysis is of prime importance in determining which genotypes can continue in the process of cultivar development and which can be successfully used in the breeding. Hybrids with high frequency of meiotic abnormalities can seriously compromise seed production, a key trait in assuring adoption of a new apomictic cultivar of Brachiaria for pasture formation. MenosThe meiotic behaviour of three three-way interspecific promising hybrids (H17, H27, and H34) was evaluated. These hybrids resulted from the crosses between B. ruziziensis × B. brizantha and crossed to another B. brizantha. Two half-sib hybrids (H27 and H34) presented an aneuploid chromosome number (2n = 4x = 33), whereas hybrid H17 was a tetraploid (2n = 4x = 36), as expected. Chromosome paired predominantly as multivalents suggesting that genetic recombination and introgression of specific target genes from B. brizantha into B. ruziziensis can be expected. Arrangement of parental genomes in distinct metaphase plates was observed in H27 and H34, which have different male genitors. Hybrids H17 and H34 have the same male genitor, but did not display this abnormality. In H17, abnormalities were more frequent from anaphase II, when many laggard chromosomes appeared, suggesting that each genome presented a different genetic control for meiotic phase timing. Despite the phylogenetic proximity among these two species, these three hybrids presented a high frequency of meiotic abnormalities, mainly those related to irregular chromosome segregation typical of polyploids, H34, 69.1%; H27, 56.1% and H17, 44.9%. From the accumulated results obtained through cytological studies in Brachiaria hybrids, it is evident that cytogenetical analysis is of prime importance in determining which genotypes can continue in the process of cultivar development and which can be successfully used in the b... Mostrar Tudo |
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Palavras-Chave: |
Braquiária; Marandu. |
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Thesagro: |
Brachiaria Brizantha; Brachiaria Ruziziensis; Citogenética Vegetal; Gramínea Forrageira; Hibridação; Hibrido; Meiose; Melhoramento Genético Vegetal; Planta Forrageira. |
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Thesaurus Nal: |
Cytogenetics; Forage grasses; Hybridization; Hybrids; Meiosis; Plant breeding. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02752naa a2200361 a 4500
001 1326512
005 2023-07-25
008 2008 bl uuuu u00u1 u #d
100 1 $aADAMOWSKI, E. de V.
245 $aMeiotic behaviour in three interspecific three-way hybrids between Brachiaria ruziziensis and B. brizantha (Poaceae$bPaniceae).
260 $c2008
500 $aResearch article.
520 $aThe meiotic behaviour of three three-way interspecific promising hybrids (H17, H27, and H34) was evaluated. These hybrids resulted from the crosses between B. ruziziensis × B. brizantha and crossed to another B. brizantha. Two half-sib hybrids (H27 and H34) presented an aneuploid chromosome number (2n = 4x = 33), whereas hybrid H17 was a tetraploid (2n = 4x = 36), as expected. Chromosome paired predominantly as multivalents suggesting that genetic recombination and introgression of specific target genes from B. brizantha into B. ruziziensis can be expected. Arrangement of parental genomes in distinct metaphase plates was observed in H27 and H34, which have different male genitors. Hybrids H17 and H34 have the same male genitor, but did not display this abnormality. In H17, abnormalities were more frequent from anaphase II, when many laggard chromosomes appeared, suggesting that each genome presented a different genetic control for meiotic phase timing. Despite the phylogenetic proximity among these two species, these three hybrids presented a high frequency of meiotic abnormalities, mainly those related to irregular chromosome segregation typical of polyploids, H34, 69.1%; H27, 56.1% and H17, 44.9%. From the accumulated results obtained through cytological studies in Brachiaria hybrids, it is evident that cytogenetical analysis is of prime importance in determining which genotypes can continue in the process of cultivar development and which can be successfully used in the breeding. Hybrids with high frequency of meiotic abnormalities can seriously compromise seed production, a key trait in assuring adoption of a new apomictic cultivar of Brachiaria for pasture formation.
650 $aCytogenetics
650 $aForage grasses
650 $aHybridization
650 $aHybrids
650 $aMeiosis
650 $aPlant breeding
650 $aBrachiaria Brizantha
650 $aBrachiaria Ruziziensis
650 $aCitogenética Vegetal
650 $aGramínea Forrageira
650 $aHibridação
650 $aHibrido
650 $aMeiose
650 $aMelhoramento Genético Vegetal
650 $aPlanta Forrageira
653 $aBraquiária
653 $aMarandu
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tJournal of Genetics, Bangalore$gv. 87, n. 1, p. 33-38, Apr. 2008.
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| 4. |  | VALLE, C. B. do. Brachiaria: Seleção vs. melhoramento. In: VALERIO, J.R.; MACEDO, M.C.M. Coletânea de seminários técnicos 1988/1991 (Resumos). Campo Grande, MS : EMBRAPA-CNPGC, 1994. p. 23 (EMBRAPA-CNPGC. Documentos, 55). CNPGC.| Biblioteca(s): Embrapa Gado de Corte. |
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