Breeding for hard red winter wheat cultivars adapted to conventional-till and no-till systems in northern latitudes |
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| Authors: | D J Cox |
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| Institution: | (1) AFRC Institute of Grassland and Environmental Research, Welsh Plant Breeding Station, Plas Gogerddan, SY23 3EB Aberystwyth, Dyfed, UK |
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| Abstract: | Summary Monosomic alien addition lines combining individual F. drymeja chromosomes and the L. multiflorum complement were isolated from the cross between the triploid hybrid L. multiflorum (4x) × F. drymeja (2x) and diploid L. multiflorum (2x). Chromosome pairing in the addition lines was studied at metaphase 1 of meiosis and the relationship between single F. drymeja chromosomes and the corresponding homologous pair in L. multiflorum is discussed. Trivalent frequency in the addition lines was higher than expected from observations of chromosome pairing in the triploid hybrid and there were differences between lines in the number of trivalent associations formed. There is some evidence to suggest that trivalent frequency is not entirely dependent on chromosome length and that transmission of the alien chromosome in the female is dependent on the size of the added chromosome. Morphological studies were made to assess the phenotypic effects of the addition of single F. drymeja chromosomes to the L. multiflorum complement. Two plants (2n=14) with recombination between a L. multiflorum and a F. drymeja chromosome were identified. |
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| Keywords: | Festuca drymeja Lolium multiflorum Italian ryegrass addition lines chromosome pairing transmission |
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