INTEGRATED CHARACTERISTICS OF THE ADAPTIVE ACTIVITY LEVEL OF WINTER RYE TETRA-PLOID SAMPLES UNDER THE NORTH-WEST OF THE RUSSIAN FEDERATION CONDITIONS

The purpose of the study is to evaluate tetraploid varieties of winter rye in terms of plasticity, ecologi-cal stability, adaptability, intensity in changing growing conditions and to identify varieties that are the best in terms of these indicators. The degree of realization of a consistently high yield is determined by the genotype and the influence of specific soil-climatic and temporal conditions. An integrated assess-ment of the level of adaptive potential of plasticity and stability of varieties makes it possible to select among the studied assortment the most high-yielding and ecologically adaptive forms of plants adapted to a wide range of cultivation conditions. Evaluation of ten varieties of tetraploid winter rye (Secale cereale tetraploidum nudipaleatum) was carried out in 2018–2021, according to fourteen parameters of adaptabil-ity, plasticity and stability of the trait – grain yield: by regression coefficient (bi), ecological plasticity index (O), multiplicative coefficient (ai), intensity index (I), ecological plasticity index (I.E.P.), adaptability coeffi-cient (C.A.), ecovalence (Wi), stability index (SI), stability index (Ϭd2), stability level indicator (A), geno-typic effect (Ɛi), coefficient of variation (V). Mathematical processing of experimental data was carried out by the method of two-factor analysis of variance without repetitions. It was revealed that the formation of rye yield is determined by 89.4 % by the conditions of the growing year and by 7.9 % by the variety. A high average yield level was obtained in varieties Siberia 4 (+0.86), Praleska (+0.63), Flame (+0.55) to the standard Verasen. A high level of adaptive activity was revealed by the sum of ranks – 14 parameters in the varieties Siberia 4 (Ʃ ranks = 50), Plamya (Ʃ ranks = 57), Praleska (Ʃ ranks = 61), Siberia 3 (Ʃ ranks = 70), Siberia (Ʃ ranks = 71).