Meiotic expression of modified chromosome constitution and structure in × Triticosecale Wittmack
The chromosome constitution and the meiotic behaviour of plants in the F3, F4 and F6 progenies of one cross between 6x-triticale (female) and Triticum aestivum (male) were analysed. C-banding of meiosis proved to be a good method to score the individual levels of pairing, to verify the chromosome constitution, and to detect structural variations. Amongst the plants examined, the chromosome constitution varied in the third genome (0-7" D and 0-6" R), and all plants had the whole A and B genomes in common. Rye chromosomes presented some modifications in distribution of heterochromatin. Other karyological variations such as D/R centric fusions or telocentrics were also occasionally observed. Segregation for missing heterochromatin in the telomeres of the arm 3RS was found amongst the plants. Chromosome pair 3R showed significantly more chiasmata in plants in which heterochromatin is deleted (– –) or present (+ +) in both telomeres than in heterozygous (– +). Both heterochromatin and chromosome constitution are discussed in relation to factors affecting meiotic pairing and interest in setting out new hybridizations. © 1990 The Genetical Society of Great Britain.
| Main Authors: | , , |
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| Format: | journal article biblioteca |
| Language: | eng |
| Published: |
1990
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| Online Access: | http://hdl.handle.net/20.500.12792/4365 |
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