RDNA VARIABILITY IN SOME TRITICEAE AND TH E FORMS OF TRITICUM-AESTIVUM OBTAINED BY WILD HYBRIDIZATION

The variability of rDNA in genomes of some species of Triticum and Aeg ilops used in breeding programmes for wheat improvement was studied. A lso, the forms of T. aestivum obtained by hybridization and Aegilops c ylindrica served as the objects of interest. The genetic distances wer e defined between some Triticum and Aegilops species, inside the A. ta usehii and A. cylindrica.populations, and between different cultivars and forms as a result of wild hybridization in T. aestivum. The extent of genetic divergence was evaluated and the schemes (trees) for genet ic relationship in the forms studied was constructed.