Integrated characteristics of the adaptive activity level of winter rye tetraploid 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, ecological 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 assessment 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 adaptability, 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 coefficient (C.A.), ecovalence (Wi), stability index (SI), stability index (Ϭd2), stability level indicator (A), genotypic 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).