The relevance is due to the introduction of the subtropical fruit crop Zizyphus jujuba (unabi) to the Volgograd region. For the first time in the conditions of the Volgograd region, the material on the biochemical properties of various varieties of unabi fruits was analyzed and generalized. The ranking of shrubs by change to conditions is based on the fixation of environmental factors and the bioecology of plant individuals based on their physiological and biochemical parameters in field and laboratory conditions. The purpose of the research is to rank the shrubs according to the degree of resistance to stress factors. The objects are plant genotypes of Z. jujuba: large-fruited, medium-fruited and small-fruited. Experimental plantings with their participation are cultivated at the collection site of the Federal Research Center of Agroecology of the Russian Academy of Sciences (Volgograd, Russia).