Buniak N. Breeding and genetic features of creating source material for hulless spring barley variety development

The dissertation provides theoretical generalization and practical solution to the scientific task of creating new source material in hulless spring barley breeding for productivity, lodging resistance, and disease resistance. This was achieved by establishing breeding and genetic evaluation of spring barley collection samples in terms of productivity and quantitative traits when taking into account the "genotype–environment" interaction in various ecological niches and determining the inheritance of yield components in hybrid populations of hulless spring barley in the conditions of the northern Forest Steppe of Ukraine. New barley lines were introduced into the breeding process, and new barley varieties with a combination of high yield, stability, and resistance to the most common diseases were created. For the first time, the morphological and biochemical features of collection samples of hulless and covered spring barley were determined, and new sources were identified in terms of productivity, resistance to abiotic and biotic factors, and their breeding value was determined. The varieties Vzirets` and CDC McGwire were identified as valuable source material in breeding for resistance to foliar diseases. The samples Dianthus, Li-1059, Li-1096, Li-1089, Erie, and Gateway were identified for their high protein content (≥ 16.0%), while the hulless barley samples CDC ExPlus, Roseland, CDC Lophy-1, CDC McGwire, CDC Gainer, and CDC Clear were for high starch content (≥ 60.0%). In co-authorship, were created the barley varieties Svitoch Nosivskyi and Nosivchanyn (the share of authorship in each variety is 15%) which were put on the State Register of Plant Varieties Suitable for Dissemination in Ukraine. Spring barley varieties Dyvo Nosivshchyny, and Hubernatorskyi were developed and submitted for the state qualification examination to the Ukrainian Institute for Plant Variety Examination.