New sources of compact spike morphology determined by the genes on chromosome 5A in hexaploid wheat
2012
Kosuge, K. | Watanabe, N. | Melnik, V. M. | Laikova, L. I. | Goncharov, N. P.
Little is known about the relationship between compact spike loci in hexaploid wheat species. We studied two new compact spike mutants of common wheat Triticum aestivum L. (2n = 6x = 42, genome formula BBAADD). The new compact spike genes, C 739 of MCK 739 and Cp of near-isogenic line Mironovskaya 808 (Vrn1), were mapped using aneuploid stocks and microsatellite markers. The C 739 and Cp loci were distally linked with the microsatellite marker Xbarc319 in the F2 populations of MCK 739 × ‘Novosibirskaya 67’ and Cp-Mironovskaya 808 (Vrn1) × ‘Saratovskaya 29’. It was evident that the loci affecting compact spikes in T. aestivum mutants were located on chromosome 5AL distal from Q locus. These loci also affected to semi-dwarfism. We named this locus Cp1 (C ompact p lant 1) for all accessions. Cp1 was allelic to C 17648 gene located on the chromosome 5AL of tetraploid wheat [Triticum durum Desf. (2n = 4x = 28, genome formula BBAA)]. These dominant genes on chromosome 5AL will be utilized as new gene resources of compact spike morphology in hexaploid wheat. Relationship between loci Q and Cp1 was also discussed.
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