The genetic-selection improvement of approaches to the study of the fruit cultures adaptation to the stresses of the spring and summer period

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.