Izhboldin O. Ecogenetic variability of winter wheat under the gamma rays action

Dissertation is devoted to the possibilities of using ecogenetic variability under the influence of gamma-rays to increase the biodiversity of winter wheat agrocenoses on the basis of local resources to obtain stable high-grain-productive and high-quality systems. Regularities and ways of using-gamma rays as an ecogenetic factor are established. The aim of the work was to investigate the ecological and genetic bases of creating high-productive and quality stable agrocenoses of winter wheat by increasing biodiversity through gamma-rays induction based on regional (local) varieties material. According to the results of scientific research at different levels of the organization of agrocenoses of cereals for the first time showed the relationship between variability at the cellular level and the consequences for the plant organism as a whole in terms of variability in characteristics; determined traits of depression for varieties of regional (local) breeding for the possibility of their use as source forms under the action of gamma rays; establishing the prospects for the use of local resources to increase artificial biodiversity in terms of total variability and stability in the mutation process; identified features of the emergence of new plant forms depending on model traits and genotypic features; the comparison of local and leading European material from the point of view of formation of stable high-yielding and high-quality agrocenoses of winter grain in the conditions of climate change is investigated; inserted key parameters that can be improved due to the mutation process for gamma rays; the mechanisms of formation of the basic economic and valuable traits of bread wheat and features of change in realization at mutational processes are defined; improved method of monitoring mutagenic activity by determining chromosomal aberrations, modeling mutagenic depression in the first generation under the influence of non-specific genetically active factors, methods of using gamma-rays to obtain promising useful forms with inherited changes, ways to improve the formation process using local material; received further development of methods for using moderate doses of gamma-rays depending on the genotype of the original form, methods for evaluating the effectiveness of physical mutagens in the context of adequate source material, methods for assessing productivity and grain quality of winter wheat.