Study of the water regime dynamics of cherry in the summer period

Russian Research Institute of Fruit Crop Breeding (VNIISPK), 302530 Zhilina, Oryol, Oryol Region, Russia

^* Corresponding author: ozherelieva@vniispk.ru

Abstract

The research was carried out on the basis of the VNIISPK Laboratory of Fruit Plant Resistance Physiology in 2019-2020. The research object was the Novella cherry variety on the clonal rootstocks of the institute selection. The purpose of this research is to study the dynamics of the water regime of the Novella variety on clonal rootstocks and to identify the most adapted scion-rootstock cherry combinations. A strong relationship was determined between the cherry leaves hydration and the average daily air temperature (r = 0.99). During the ripening period of the fruits of the Novella variety scion-rootstock combinations, the maximum decrease in the total water in the leaves was recorded. The water content decreased as the age of the leaves increased. The decrease in water content in the Novella scion-rootstock combinations was accompanied by an increase in the dry matter content in the leaf tissues. There was a strong relationship between the dry matter accumulation in the leaves and the average daily air temperature (r = -0.99). The water deficit in the leaves depended on the hydrothermal regime of the summer period. Correlation (r = 0.76) between the leaves water deficit and the average daily air temperature, the amount of precipitation (r = -0.77) and the HTC (r = -0.83). The highest water deficiency indicator in leaves was found during shoots growth and formation of the leaf apparatus in the Novella variety on clonal rootstocks. The conducted studies allowed to identify adapted scion-rootstock combinations of Novella/Rubin, V-2-180, 74340, 74336, 74332, which, against the background of water content decrease and dry matter accumulation were characterized by the lowest water deficit of leaves in the summer.