Skripnik V. Assessment of the manifestation level of adaptability and productivity of seedless grape genotypes and selection of promising ones for the further breeding process

varieties and obtaining a high-quality product. The scientific novelty of this research lied in the fact that for the first time in Ukraine a comprehensive study of introduced grape varieties that are genetically and geographically distant was performed in order to replenish the local assortment of seedless varieties according to modern world tendencies. Based on the screening of research material, source literature, and practical experience, optimal levels of manifestation of valuable characteristics and adaptability of introduced seedless varieties in the conditions of the Northern Black Sea region were determined (productivity > 12 t/ha, marketability > 70 %, seedlessness class I-II, etc.). For further usage in the breeding process, varieties suitable as donors of valuable traits were selected via breeding, phytopathological, and molecular genetic methods. They are “Kishmish tairovskii”, “Flame seedless”, “Attika”, “Mars”, “Jupiter” and others. A level of manifestation and inheritance of main valuable traits were studied in hybrid combinations bred in the Institute of Viticulture and Winemaking named after V. E. Tairov and their seedless parent varieties. It was proved that the more genetically and geographically complex origin a variety has and the more Vitis species are present in its genotype, the more complex and diverse the splitting in the F1 generation will be in the following characteristics: berry color, bunch size, berry size, vigor, etc. Scientifically substantiated recommendations regarding using “Kishmish tairovskii”, “Jupiter”, “Sultanina”, “Beogradska besemena”, “Flame seedless”, “Kishmish luchistii”, “Gleanora” and “Attika” in the breeding of highly productive seedless grape cultivars, suitable for the conditions of the Northern Black Sea region, were developed. According to the results of the hybridological analysis, the following hybrid combinations: “Victoria” x “Jupiter”, “Kobzar” x “Rusensko bez seme”, “Kobzar” x “Kishmish tairovskii”, were characterized by a high amount of viable seedlings (from 2.5 to 9.5 %) including promising seedless genotypes (from 0.4 to 0.8 %).