Winter wheat mutations by plant height and structure caused by chemical supermutagens

The objectives of our investigations are to describe the variation by mutations of stem architecture of the modern Ukrainian winter wheat varieties due to their interactions with mutagen concentration and genotype-mutagen interaction specific. Agronomic-value mutations like as short stem, dwarfs and semi-dwarfs have been investigated too. New perspective mutant lines have been obtained in terms of mutation breeding program. Main components for mutation breeding successful was genotype-mutagen interaction (due to factor analyses). By mutation occurs (in sense of mutation rate and spectra) genotypes can be subdivided on two groups. At the first group only varieties, which obtained with nitrosoalkylurea were observed. At second group other six varieties. Nitrosoalkylurea were less useful for obtaining mutations by plant architecture for any varieties. Higher level of short-stem and semi-dwarfs mutation were inducted by NMU 0.025%. Semi-dwarfs as mutations significance responded to nitrosoalkylurea action by genotype-mutagen interaction.