Purpose. To carry out a comprehensive study and evaluation of new varieties of potatoes (Solanum tuberosum L.) according to the main economic and valuable indicators: yield, resistance to diseases and the content of starch and dry matter. Methods. The qualification examination of potato varieties for suitability for distribution in Ukraine (PSP) is carried out throughout the territory of Ukraine within the soil and climate zones of the Forest Steppe and Polissia in accordance with the Methodology for the qualification examination of plant varieties for suitability for distribution in Ukraine (General part) and the Methodology for the examination of varieties potato plants and groups of vegetable, melon, spicy-tasty plants for their suitability for distribution in Ukraine. Results. Economic and valuable characteristics of new potato varieties ‘Acoustic’, ‘Lady Amarilla’, ‘Sensation’, ‘Mia’, ‘Baltic Fire’, included in the State Register of plant varieties suitable for distribution in Ukraine (hereinafter – Register of varieties), were studied. An analysis of the varietal potential of potatoes was carried out based on the results of the qualification examination of the varieties. It was established that the yield of the stu­died potato varieties in all years of examination was higher in the forest-steppe zone and exceeded the yield obtained in the Polissia zone. In particular, the productivity of the varie­ty ‘Sensation’ by 29%, ‘Mia’ by 20%, ‘Lady Amarilla’ by 16%, ‘Baltic Fire’ by 19%, ‘Acoustic’ by 21%. Varieties ‘Sensation’ (24.3–33.8 t/ha) and ‘Acoustic’ (25.5–30.2 t/ha) produced the highest yield over the years of research. The varieties ‘Lady Amarilla’ and ‘Baltic Fire’ prevailed in terms of qua­lity indicators: the starch content in their tubers was 13.7–15.4% and 13.3–13.9%; dry matter content 22.2–23.2% and 21.5–22.0%, respectively. Disease and pest damage was generally average, with late blight causing the most dama­ge to crops in the Polissia zone. Conclusions. Based on the results of the qualification examination, five positive expert opinions were prepared for the PSP. All studied varieties are recommended for growing in the Forest-Steppe and Polissia zones. Cancer-resistant potato varieties are proposed for introduction in disease foci and use as parental components and obtaining disease-resistant offspring. Cancer-resistant potato varieties are recommended to be grown in areas where the disease is likely to be detected and used in bree­ding to obtain new cancer-resistant varieties.

Purpose. Analysis of plant micropropagation technologies for the creation of viable interspecific hybrids and varieties of Actinidia Lindl. Methods. General scientific – hypothesis, experiment, observation, analysis, synthesis method for drawing conclusions. Results. The introduction of in vitro technologies is now becoming the dominant commercial method of large-scale and rapid production of seedlings with stable inheritance of variety traits, high multiplication rate, preservation of economically valuable traits in the absence of production seasonality and time constraints. In addition to reproduction, the breeding process is also accelerated, including mutagenesis and hybridization. It is important to obtain not only a sterile explant, but also a morphogenically active one, that is, a plant that takes roots and subsequently regenerates in vitro. The best in terms of decontamination efficiency is the method of treatment with hypochlorite and the addition of PPM biocide to the nutrient medium, but under these conditions, the lowest survival of explants in all samples was noted. The efficiency of introduction into aseptic culture at the first stage of micropropagation is also affected by the biological characteristics of the primary explants. In studies with nutrient media for A. arguta, it was found that of the elements of mineral nutrition, only 11 ions are necessary for life: five macro- (N, K, P, Mg, S) and six microelements (Cl, Fe, B, Mo, Na, I). Plants in vitro have a lower dry matter content and a greater amount of moisture, including free moisture, which is quickly lost when the water balance is disturbed. Conclusions. The abi­lity to regenerate is more pronounced in the species A. chinensis and A. deliciosa, and to a lesser extent in A. arguta. For A. chinensis, the use of hydroponic technology for the adaptation of regenerants at the ex vitro stage is effective.