Experimental analysis of leaf drought resistance at the collection of clonal apple rootstocks bred by the Michurinsk State Agrarian University

Abstract

the dynamics of the chemical components content at plum fruits was studied for the growing seasons 2018-2021, significantly different in terms of average monthly temperatures and precipitation amounts. On average, during the study period, 10.8-16.2 % of soluble solids, 8.1-9.2 % of sugars, 1.5-3.4 % of titrated acids, -4.3-10.5 mg/100 g of vitamin C accumulated in fruits. the sugar-acid index varied from 4.1 to 4.4. In the studied plum cultivars during the research period, positive correlations of a high level were noted between the content of soluble solids and the amount of sugars in the fruit (at the level of 0.99), as well as between the content of vitamin C and titrated acidity (0.88). the positive effect of sufficient moisture on the level of accumulation of sugars, soluble solids and vitamin C in fruits was also recorded. A negative correlation was observed between the values of the average monthly summer temperatures and the vitamin C content.