COMPARATIVE ANALYSIS OF MECHANICAL COMPOSITION AND DYNAMICS OF PHYSICOCHEMICAL PARAMETERS IN “ARENI SEV” GRAPE VARIETY AND ITS CLONES

Within the scope of this study, a comparative analysis was conducted on the mechanical composition and dynamics of physicochemical parameters of the Vitis vinifera cultivar “Areni Sev” and its clones: “Nosr Areni”, “Areni Sev Clone №9”, “Areni Sev Clone №15”, and “Areni Sev Clone Berqatu”. The investigations were carried out in 2024–2025 at the National Grape Collection Vineyard located in the Ejmiatsin region of Armavir Province, Armenia. The dynamics of sugar accumulation, titratable acidity, and pH were examined, along with structural and compositional indicators of the bunch and berries, in accordance with the methodology developed by N.N. Prostoserdov. The obtained results demonstrate that clonal selection significantly improves the agrobiological and technological characteristics of the “Sev Areni” variety. In particular, “Nosr Areni” and “Areni Sev Clone №9” stand out with superior bunch structural indices, higher pulp-to-juice ratios, and more intensive dynamics of sugar accumulation. The cluster composition index was 3.21 for the “Areni Sev” variety, with the highest values recorded for “Areni Sev Clone №9” and “Nosr Areni”. Differences in mechanical composition in terms of berry number, seed mass, and skeletal proportion indicate the influence of genetic mutations on productivity and juice yield. The obtained data confirm that the studied clones are promising for the production of high-quality wines and can be purposefully applied to enhance winemaking efficiency under Armenian climatic conditions.