The effect of the load of bushes with shoots on the stress resistance of grapes of the varieties Vladimir, Dmitry, Kurchansky

Due to the currently observed global and local climate changes, there is an imbalance in the biological cycles of plants, a change in their resistance to biotic and abiotic stressors. The level of realization of the potential of economic productivity of grape varieties in the Krasnodar Territory is low and amounts to 60%. At the heart of its increase is the optimization of the placement of grape plantations, taking into account varietal characteristics and variety-oriented, zone-oriented technologies of grape cultivation. Varietal agrotechnology, which provides for the establishment of an optimal load of grape bushes with shoots, plays an important role in regulating the growth of the grape bush and its individual parts, the formation of plant resistance to stressors and the quality of viticulture products. Due to the more frequent manifestation of stressful weather conditions during the growing season of grapes, namely, insufficient soil moisture in combination with high temperature and low humidity, an urgent area of research is the study of stress resistance indicators under different loads of bushes with shoots. The purpose of the research is to study the effect of the load of bushes with shoots on the stress resistance of grape varieties of domestic selection Vladimir, Dmitry, Kurchansky. Indicators characterizing the stress resistance of plants, such as electrolyte yield, hydration, water deficiency and loss of water by leaves (water retention capacity), have been studied. A variety-specific reaction of grape plants to changes in the load of bushes with shoots under stressful conditions (insufficient precipitation and high air temperature) has been established. Increasing the load in Dmitry and Kurchansky grape varieties improves stress resistance indicators, such as tissue hydration, water deficiency and water retention capacity. The Vladimir variety had the best performance with a minimum and average load of bushes with shoots.

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