Evaluation of barley accessions on the content of antioxidants in grain in the conditions of Eastern Siberia

The aim of the study is to determine the adaptive potential of barley accessions by the total antioxidant content (TAC) in the grain and 1000 grain weight, as well as to analyze the relationship between these traits of barley, on the one hand, and the adaptability indicators of accessions for them, on the other. The object of the study was 10 accessions of hulled barley, which were grown under the conditions of Eastern Siberia in three ecological points: Krasnoyarsk Territory, Republic of Khakassia and Republic of Tyva. The HTC values for these items were respectively: 1.50, 1.25, 0.93. In barley accessions, the TAC value was determined using the Tsvet Yauza-01-AA device; gallic acid was used as a reference sample. According to these two traits of barley accessions, 5 indicators of their adaptability were calculated: the coefficient of ecological variation Cv, the stress resistance index d, the homeostatic parameter Hom, the indicator of the level and stability of the variety PUSS, the parameter of the selection value of the variety Cs. It was found that the highest level of TAC in the grain was characteristic of the Uvatsky and Acha accessions. Biom and Abalak accessions positively stood out in terms of grain size. It is shown that the optimal values of the adaptability parameters and their smallest sum of ranks in terms of the TAC value in the grain were characteristic of the accessions Acha and Biom, and those in terms of the weight of 1000 grains were noted in the same accession of Takmak barley. It was found that the relationship between the average values of TAC in the grain of barley accessions and the indicators of their stability of variety stability indicator and Cs for this trait was positive and significant. The presence of a positive relationship between the average value of 1000 grain weight and the stability parameter Cs for the specified feature was statistically proven. The demonstrated result may indicate that when sampling barley for an increased value of TAC in grain, the stability of the manifestation of this trait under different growing conditions is likely to increase.