The results of many years of research on propagation of promising forms of clonal stocks of apple trees of the Michurinsk State Agrarian University selection in the mother plantation by stooling, by herbaceous cuttings and by clonal micropropagation are presented. According to the complex of economic and biological features, promising clonal rootstocks of an apple tree with high shoot-forming capacity in the mother plant were identified: dwarf apple trees 2-3-49, 2-15-2, 2-15-15, 3-4-7, 5-21-27; semi dwarf apple trees 2-3-14, 2-9-49, 2-9-102, 2-12-10, 5-24-1, 5-27-1. The rootstocks that are promising for propagation by herbaceous cuttings – 2-3-14, 2-3-49, 2-12-10, 2-15-15, 3-4-7, 5-21-93; at the same time, treatment with exogenous promoters such as IBA and NAA at a concentration of 50 mg/l increases the yield and quality of stock material. A modified MSO nutrient medium with the addition of 0.5-1.0 mg/l of 6-BAP and 0.1-0.2 mg/l of IBA is selected for the clonal micropropagation of apple stocks.

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оценка устойчивости к засолению гибридных сеянцев яблони, полученных от топкросс-скрещиваний. Выявлено влияние как аддитивных, так и неаддитивных генных взаимодействий на формирование устойчивости при некотором преобладании последних. Выделены доноры и гибридные семьи с высокой комбинационной способностью, перспективные для практического использования в селекции на устойчивость к засолению. Выделены гибридные сеянцы-источники высокой и стабильной устойчивости. Ключевые слова: яблоня, селекция, солеустойчивость, гибридные сеянцы, доноры, наследование, комбинационная способность. Summary. Evaluation of apple hybrid seedlings obtained from topcross-crosses for resistance to salinity was carried out. The infl uence of both additive and non-additive gene interactions on the formation of resistance with some predominance of the lasts was revealed. Donors and hybrid combinations with high combining ability, promising for practical use in breeding for resistance to salinization were identifi ed. Hybrid seedlings as sources of high and stable resistance were singled out.