Biochemical Characteristics of Drought-Resistance of the Scab-Immune and Non Immune Apple-Tree Varieties

This work outlines the findings of physiological-biochemical and anatomic research of the apple-tree varieties differing in ecological-geographical origin with varying scab-immunity under the drought conditions. The most significant parameters, responsible for drought adaptability of the apple-trees. The study was given to peculiarities of moisture status, pigment complex during the drought season of vegetation. The data on the mechanisms of the chlorophylls (а+b), carotinoids protective action to improve the drought resistance of apple-trees are presented. The enhanced immunity of variety was established to have positive impact on its drought resistance, improves its ecological plasticity. The highly droughtresistant apple-tree varieties were singled out for growing in the North-Caucasian region of the Russian Federation.

Keywords: Apple-Tree, Scab, Drought Resistance, Water Content, Chlorophylls Totality, Carotinoids, Xeromorphic Characters.