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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
29/06/2012 |
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Autoria: |
BERNARD, M.; BERNARD, S. |
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Título: |
Meiotic pairing in hybrids between tetraploid Triticale and related species: new elements concerning the chromosome constitution of tetraploid Triticale. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Theoretical and Applied Genetics, v. 70, n. 4, p. 390-399, 1985. |
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Idioma: |
Inglês |
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Conteúdo: |
Two F5 strains of tetraploid triticale (2n= 4x=28), obtained from 6x triticaleX2 rye progenies, were crossed with diploid and tetraploid rye, some durum and bread wheats, and various 8x and 6x triticale lines. Meiosis in the different hybrid combinations was studied. The results showed that the haploid complement of these triticales consists of seven chromosomes from rye and seven chromosomes from wheat. High frequencies of PMCs showing trivalents were observed in hybrids involving the reference genotypes of wheat and triticale. These findings proved that several chromosomes from the wheat component have chromosome segments coming from two parental wheat chromosomes. The origin of these heterogeneous chromosomes probably lies in homoeologous pairing occurring at meiosis in the 6x triticaleX2x rye hybrids from which 4x triticale lines were isolated. A comparison among different hybrids combinations indicated that the involvement of D-genome chromosomes in homoeologous pairing is quite limited. In contrast, meiotic patterns in 4x triticale X 2x rye hybrids showed a quite high pairing frequency between some R chromosomes and their A and B homoeologues. |
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Palavras-Chave: |
Genome affinity; Genome re-arrangement. |
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Thesaurus Nal: |
chromosome pairing; interspecific hybridization. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01783naa a2200181 a 4500
001 1840936
005 2012-06-29
008 1985 bl --- 0-- u #d
100 1 $aBERNARD, M.
245 $aMeiotic pairing in hybrids between tetraploid Triticale and related species$bnew elements concerning the chromosome constitution of tetraploid Triticale.
260 $c1985
520 $aTwo F5 strains of tetraploid triticale (2n= 4x=28), obtained from 6x triticaleX2 rye progenies, were crossed with diploid and tetraploid rye, some durum and bread wheats, and various 8x and 6x triticale lines. Meiosis in the different hybrid combinations was studied. The results showed that the haploid complement of these triticales consists of seven chromosomes from rye and seven chromosomes from wheat. High frequencies of PMCs showing trivalents were observed in hybrids involving the reference genotypes of wheat and triticale. These findings proved that several chromosomes from the wheat component have chromosome segments coming from two parental wheat chromosomes. The origin of these heterogeneous chromosomes probably lies in homoeologous pairing occurring at meiosis in the 6x triticaleX2x rye hybrids from which 4x triticale lines were isolated. A comparison among different hybrids combinations indicated that the involvement of D-genome chromosomes in homoeologous pairing is quite limited. In contrast, meiotic patterns in 4x triticale X 2x rye hybrids showed a quite high pairing frequency between some R chromosomes and their A and B homoeologues.
650 $achromosome pairing
650 $ainterspecific hybridization
653 $aGenome affinity
653 $aGenome re-arrangement
700 1 $aBERNARD, S.
773 $tTheoretical and Applied Genetics$gv. 70, n. 4, p. 390-399, 1985.
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