ANALYSIS OF ADAPTIVE POTENTIAL OF SPRING BARLEY VARIETIES AND LINES BY CHARACTERISTIC «WEIGHT OF 1000 GRAINS»

The adaptive potential of varieties and promising lines of spring barley under the conditions of Predkamskaya zone of the Republic of Tatarstan (RT) 2019-2021 was estimated by statistical parameters calculated by the indicator "mass of 1000 grains". By the method of two-factor analysis of variance we established the significant effects of year conditions, genotypes and their interaction on the indicator "mass of 1000 grains". Determination of the influence of factors and their interaction in the total phenotypic variation of the trait "mass of 1000 grains" showed that in the conditions of Predkamskaya zone of RT the main contribution to such variation is made by the factor "years" (82,7%). The contribution of genotypes in the total variation of the trait was 10.5%, the specific interaction "genotype x year" accounts for 6.8%. The high indicator of the general adaptive capacity (OACi), which characterizes the genotype by the ability to provide the maximum level of manifestation of the trait in the whole set of environments, was noted in the varieties Orlan, Volga 22 and Endan (2,07; 4,68 and 3,45g, respectively). High values of variants of specific adaptive ability (σ2CACi) were noted in varieties Nur, Endan, line K-20-17 (141,85;130,19; 128,59, respectively). The most adapted genotypes to a number of environments in the conditions of Predkamsky zone of the RT were varieties Povolzhsky 22 and Fandaga, characterized by high values of relative stability (Sgi=19.3 and 19.5%, respectively). The best genotypes, combining high index of 1000 grains weight with stability were varieties Povolzhskiy 22 and Fandaga (Sgi=28,12 and 25,64, respectively). Judging by the value of the linear regression coefficient (bi), the varieties Nur (1,17), Endan (1,11) and line K-20-17 (1,13) had the greatest responsiveness to changes in environmental conditions. The lowest index of genotype-environment interaction (σ2(G x E)gi=2,31) was in the variety Endan, which indicates its narrow adaptation to a certain type of conditions