Barley samples evaluation for adaptability in grain oil content under the Khakassia conditions

The aim of the study is to determine the indicators of adaptability of barley varieties grown in the conditions of the Republic of Khakassia, and to identify a possible relationship between the oil content in the grain of barley samples and the level of their stability for this biochemical trait. In the work, 6 samples of hulled barley were used, grown for two years on the territory of the Beisky and Altai Regions of the Republic of Khakassia. Weather conditions during the growing season significantly differed both by years and by study points. The oil content in barley grain was carried out by a known chemical method in a Soxhlet apparatus according to GOST 29033-91. For barley accessions, two parameters of ecological plasticity of accessions (coefficient of variation Cv and stress resistance index d) and three stability parameters of accessions (indicator of the level and stability of the variety PUSS, the homeostatic parameter Hom, and the index of the breeding value of the variety Cs) were calculated for this trait. It was determined that the minimum value of plasticity and the maximum value of stability (and, accordingly, the minimum sum of ranks) in terms of oil content in the grain for the conditions of Khakassia was distinguished by the Vitim barley sample. The Buyan barley sample turned out to be the least valuable in terms of adaptability with the maximum sum of ranks. It was shown that barley samples with a higher oil content in the grain were characterized by increased values of all stability parameters for this trait, and the indicated positive relationship was statistically proven for the Cs parameter. The found result may testify in favor of the fact that the selection of barley for the maximum stability of samples on the basis of "oil content in the grain" will not be accompanied by a decrease in its oil content.