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Relevance. Mung bean is a new culture of versatile use for the Middle Volga region; it has a complex of valuable economic and biological properties. When studying seeds, seedlings and mung bean plants as raw materials for the pharmaceutical industry, it was revealed that this culture also has a biocidal effect on phytopathogens. The purpose of our research is to study the biological activity of the juice from the sprouts of mung bean on the seedlings of spring soft wheat for the subsequent creation of theoretical foundations for the development and use of mung bean as a growth stimulant and protection of wheat seedlings from phytopathogenic organisms.Methods. To obtain juice, three-day seedlings of mung bean of the Saltan variety were taken. Three varieties of spring soft wheat created at the Volga Research Institute of Breeding and Seed Production named after P.N. Konstantinov were used in the experiments — Kinelskaya 2020, Kinelskaya jubilee, Kinelskaya Zvezda.Results. The effect of juice from green and etiolated mung bean seedlings on phytopathogens and the growth of spring wheat seeds in the early stages of organogenesis was studied. It was found that the juice of green seedlings has a pronounced biocidal and stimulating activity. Thus, in the tested variants, the formation of primary roots exceeded the control by 15–26%, the length of primary roots exceeded the control by 248– 297% and the length of sprouts — by 337–403%. There were no signs of damage in all tested variants. In the juice of etiolated seedlings, such activity is less pronounced. Only at a concentration of cell juice of 1% in the studied wheat varieties, an excess over the control was observed: the formation of primary roots — by106–112%, the length of primary roots — by109–127% and the length of sprouts 108–125%. In other versions of this experiment, the results were ambiguous. The defeat of phytopathogens manifested itself, but the number of affected wheat seeds decreased as the concentration of cell juice solutions increased.

The work’s results on introducing a new (for the region) agricultural cropper – mung bean, Vignaradiata (L.) Wilczek are presented in the article. This is an ancient cropper of southern origin, which has a set of valuable economical and biological properties and qualities. The spread of this cropper was limited recently by its requirements for climatic conditions. However, global and local climate changes on the planet contribute to the advancement of crop production’s boundaries to the north. In particular, research shows that the Samara region turned out to be currently the farthest northern geographical point in the world where the mung bean can grow. The mung bean study has been carried out since 2013 in order to determine the possibility of breeding’s work beginning leading to the creation of varieties with the purpose to the environmental conditions of the Middle Volga. The starting breeding material was developed. The “Saltan” variety was created on the base of single-seed descent method, which exceeded the seed parent form in terms of productivity and the bush height. This variety was transferred to the Russian Federation’s State Expert Committee on Examining and Protection of successful breeds in 2020. On the basis of the previous studies, it can be concluded that the mung bean plants in the Middle Volga region do not have distortion in the cycle’s developmental scion. The stage processes are stable and adapted to the local climatic conditions; the productivity and size of these plants correspond to the required crop’s indicators; the life form bushing-is saved; self-seeding is not formed. The plants successfully breed by artificial means; the vegetative way of breeding was not revealed. It is necessary to continue studying the influence of biotic and abiotic environmental factors on the production process in specific weather and climatic conditions of the area alongside the selection process.