In recent years, in the ATU Gagauzia (Republic of Moldova), the mass introduction of a number of certified virus-free clones of classic European varieties into the assortment has received special scientific and industrial interest. The main planting of the vineyards is carried out with the planting material of these clones. However, the physiological characteristics of growth, photosynthetic activity and productivity of European clones of grapes in the conditions of ATU Gagauzia have not been sufficiently studied. In this regard, it becomes relevant to study the type of supports, the shape of the bushes, the growth management system in the cultivation of European clones and the development of scientific foundations for these agricultural practices associated with the enhancement of the photosynthetic activity of the leaf surface and the biological productivity of shoots and bushes. This article explored the morphological and physiological parameters of growth of the leaf area surface grapes variety Merlot clone 348, conditions in ATU Gagauzia (Republic of Moldova), at different ways of doing growth of bushes (the hanging and vertical). In order to establish the basic patterns of development of annual shoots, we studied the introduced clone 348 of the Merlot variety for the number of shoots, the development of linear growth, the diameter of the shoots, and the development of the volume of growth in the phases of the growing season. It was found that the number of shoots in clone 348 of the Merlot variety varied from 25.3 to 28.3 pcs./bush with an average of 22.5-28.0 leaves, the length of the one-year growth is 136428 m/ha, the volume of the bush growth is 2.31 dm3, the area of leaf blades is 0.0221 cm2, the leaf area of vine plantations of this clone is 41778.3-45748.7 m2/ha. The content of plastid pigments, their ratio and state, the dynamics of chlorophylls and carotenoids in leaves are important indicators of the photosynthetic activity of plants. The concentration of chlorophyll a is 8.634, chlorophyll b 4.548; the sum chlorophylls a + b – 13.182 and carotenoids - 2.461 mg/g absolutely dry matter. The average number of bunches in clone 348 of the Merlot variety is 35.8-40.1 pcs./bush, the average bunch weight is 133.1-176.4 g, the yield is 5.34-6.32 kg/bush or 129.4-153.2 c/ha. Mass concentration of sugars 210-271 g/dm3, titratable acids 8.3-9.8 g/dm3.