Kryvoruchko L. Variability of agronomic-valuable traits and features of selection for productivity of winter wheat in stressful environmental conditions

The work is aimed at solving such a problem as establishing of the peculiarities of the formation of agronomic valuable traits of winter wheat in the years with different times of the renewal of spring vegetation. It was found that among all studied indexes, (harvest index, linear spike density index, potential productivity index, micro-distributions index, intensity index) had, for all studied periods of spring vegetation recovery time, a stable genetic variation coefficient. According to the results of the research, from all the diversity of vegetative traits, stable genetic correlations were observed between yield capacity and plant height, and yield capacity and length of the upper internode at the first and second term sowing during early vegetation. Through the use of cluster analysis and dendrogram analysis of the distribution of winter wheat varieties and breeding lines by the best groups in the first and second sowing periods, it was established that early and late vegetations, which operated during the years of study, as stress factors, identified the same winter wheat varieties, that were placed in the best cluster groups in both the first and second sowing periods. It is established that the location of winter wheat varieties and lines by clusters on the dendrogram corresponds to their origin, and winter wheat varieties combine unique combinations of genes alleles that provide both the formation of important economically useful traits, and adaptation to biotic and abiotic, and abiotic increased adaptive properties. Winter wheat varieties Karmelyuk, Sanzhara were created.