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The study of the inherited features of the genotype and the directions of variability of breeding-valuable traits of strawberry varieties and hybrid forms is an integral part of most researches in the field of this crop breeding. The purpose of this work was to determine the most promising strawberry varieties and hybrid selections by a complex of economically significant characteristics based on the assessment of their selection and genetic potential. In the period 2018–2020, 7 varieties and 17 inter-variety hybrids of strawberry were studied. Using methods of multivariate mathematical statistics, including calculation of factor contributions, estimation of principal components, and cluster analysis of the hierarchical algorithm using the Ward method, the variability of strawberry genotypes in terms of crop structure and quality was estimated. It is shown that variety genotype makes a decisive contribution to the variability of the studied forms. The model of the ideal variety was used as a comparative criterion for promising varieties and hybrid selections. As a result of clustering and combining the studied forms in the intervals of Euclidean distances, a high assessment was made for the selection and genetic potential of strawberry varieties Onda, Belrubi, Florence and Nelli, as well as hybrid forms with their participation.

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The happening global and local fluctuations of climate caused the changes in manifestation of the temperature stresses in the plants in terms of their strength and time of occurrence in vegetation period. The most regions of the south of Russia (especially in the plain territories) experienced warming of climate, and the temperature stresses began to appear more frequently in spring and in summer. With an aim to analyze the direction of change in temperature regime the structure and spectrums of variability in the mean-diurnal fluctuations of the maximum and minimum temperatures of air were studied for a long period (1950-2019) in the Kuban river horticulture zone of Krasnodar Territory. The defense and adaptive reactions of the sweet cherry varieties (in their drought resistance) to the change in external environment limits were brought to light. The yielding capacity of the genotypes of plants was studied from position of their response to the temperature stresses. The obtained results permitted to identify the varieties of sweet cherry, resistant to the stresses of the spring and summer period, when they are grown in conditions of the higher temperatures and considerable moisture deficit. The results of work will be helpful in control of the sweet cherry varieties productivity on the basis of knowledge on manifestation of the varieties’ genetic peculiarities in their phenotype in the new climatic conditions.