INDUCED MUTATIONS OF WINTER WHEAT CAUSED BY GAMMA-RAYS FIXED ON PLANT HEIGHT AND STEM STRUCTURE

The objectives of our investigations are to describe the variation by mutations of stem architecture of the main groups of modern Ukrainian winter wheat varieties (8 varieties) due to their interactions with dose specific. Agronomic-value traits like as general short stem, dwarfs and semi-dwarfs have been investigated too. New perspective mutant lines have been obtained in terms of investigation. Main components for mutation breeding successful was genotype-mutagen interaction (due to factor analyses). By sensibility (in sense of number of mutations and type of mutations) genotypes can be subdivided on two groups. At the first group only varieties, which created with gamma-rays were observed. Gamma-rays were not useful for obtaining mutations by plant architecture for radiomutants varieties. Higher level of short-stem and semi-dwarfs mutation were inducted by 200 – 250 Gy doses, while for dwarfs in spite of dwarfs, which were observed more after 250 Gy. Semi-dwarfs as mutations significance responded to gamma-rays action by changes with doses.