Object of the research: peculiarities of the soya samples resistance manifestation of different ecological and geographical origin to Fusarium, bacteriosis, virus diseases, Etiella Zinckenella, drought and cold in the conditions of artificial infectious and provocative backgrounds and its connection with valuable farming features, the determination of the type of ecological samples plasticity by the complex of valuable farming features and the establishment of its peculiarities manifestation, the selection of valuable samples for replenishing the bank of plant genetic resources and using it as the initial material in the crop selection. Purpose of the research: determination of the peculiarities of the resistance manifestation to the complex of harmful organisms and stressful environmental conditions of the world gene pool samples and modern soya varieties, the selection of integrated resistance sources in combination with valuable farming features, the formation on its basis the peculiarities collections and further introduction into breeding programs. Methods of the research: general scientific, field, laboratory, statistical. Novelty: the establishment of the peculiarities of the soya samples resistance of various ecological and geographical origin and modern varieties to the complex of harmful organisms of biotic genesis and abiotic factors in combination with valuable farming features; the study differs from the previously known works by using a set of field and laboratory methods for determining genotypes with the combination of valuable features, and the creation on its basis a valuable source for the final soya bean selection. For the first time in the conditions of the eastern part of the Ukraine’s forest-steppe on the artificial infectious background, the features of the soya samples resistance of various ecological and geographical origin to the complex of dominant species of root rot are determined, as well as the resistance to bacteriosis, virus diseases, Etiella Zinckenella on the provocative backgrounds. The samples with stable high resistance (individual, group, complex) over the years were found. The samples reaction to the environmental stress factors under controlled conditions of temperature and humidity was determined as well as the level of resistance to cold and drought; genotypes with a combination of resistance to diseases, pests, drought, cold and high productivity were revealed. The dependence of the main productivity elements on the genotype resistance level to harmful organisms was defined. The efficiency of the express method for evaluating soya samples of different ecological and geographical origin and new varieties for resistance to fusarium root rot in the laboratory conditions was determined. Results: Six samples of soya with complex resistance to biotic and abiotic factors and its combination with productivity, which were transferred for the registration at the National Center of Plant Genetic Resources of Ukraine. A resistant material to fusarium root rot, bacteriosis, virus diseases, Etiella Zinckenella, cold and drought material, which is used in the soya selection laboratory of the Institute of Plant Cultivation named after V. Ya. Yuriev is determined. A "Method for evaluating the resistance of soya to fusariosis pathogens " was developed. One soya variety was created with the participation of the applicant; it was transferred to the state variety trial. The catalogue of the initial material for soya breeding was formed for the resistance to the main pathogens of diseases and pests. The method of breeding value estimation as to the combination of valuable farming features according to ecological plasticity was given. Degree of introduction: the developed method was tested in the laboratory of soya selection at the Institute of Plant Cultivation. Fields of introduction: scientific institutions of NAAS, National Academy of Sciences and the Ministry of Agrarian Policy of Ukraine, educational institutions, agrarian formations of agro-industrial complex of Ukraine.
