PHYSIOLOGICAL FEATURES OF THE LEAF OF FRUIT CROPS IN THE SUMMER
In present work, the physiological characteristics of the leaves of three fruit crops - plum, sweet cherry and pear - were studied during the summer period. Three varieties were selected for each crop culture. Zoned varieties for the south of Russia were taken as control varieties. The obtained results showed that the plum variety Milena of the NCDSCHVW breeding exceeded the values of the control variety in terms of water-retaining capacity and stability of cell membranes in the leaves. The sweet cherry variety Sashenka of the domestic breeding was characterized by high levels of pigment content and relative water content in the leaves, which corresponded to the values of the control variety Alaya. Among the studied pear varieties, high values of the analyzed physiological parameters were found in the Flamenco variety. According to the obtained data, the selected varieties of Russian breeding proved to be resistant during the studied summer period and, in some respects, had a higher potential for growth and development than the control varieties.