Modern crop cultivation technologies use biological products with adaptogenic and biofungicidal properties. The article studies the influence of Streptomyces sp on the growth, development, and formation of buckwheat crops. The treatment of seeds with biological products reduces field germination; however, their environmental sustainability increases. The maximum grain yield of 249.7 g/m2 was obtained when applying actinomycetes in the amount of 2.0 l per ton of seeds. The ability of the biological product to preserve the activity of nodes and shoots increased the number of inflorescences. The dynamics of biosynthesis and the fractional composition of chlorophyll in the leaves were studied. The biosynthesis of pigments was the most intensive during during seed treatment with Streptomyces sp in the amount of 1.0 to 1.5 l/t of seeds. The relative amount of chlorophyll “a” to chlorophyll “b” during the intensive development and mass flowering was relatively stable (2.5 ... 2.7). In the phase of fruit formation, in the control plants and plants treated with Rizoplan and actinomycetes (0.5 l/t), the proportion of chlorophyll b increased. In variants with a lower proportion of chlorophyll “b”, the seed productivity of plants was higher.

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Fagopyrum cymosum Meissn. is a wild perennial species of buckwheat, which grows in southwest Asia. Despite rather active economic use of perennial buckwheat, only the most general information concerning the morphology and reproductive biology of the species is found in the literature. At the same time, such information could be useful for conducting genetic-selection works. In the case of the introduction of F. cymosum into the territory of European Russia, a comprehensive study of a new species will be required. The purpose of this study is a complete morphological description, identification of flowering and nectar features, evaluation of pollen fertility and seed productivity of perennial buckwheat F. cymosum in the Republic of Tatarstan. As a result of the studies, a morphological characteristic of perennial buckwheat is given. The strong branching of shoots and flower-bearing axes of F. cymosum was revealed. It turned out that the structure of the buckwheat flower is characterized by high variability. Flowers with the highest frequency were found with the formula P5A8G(3) (83,3%) and P5A9G(3) (10,7%). Among the anomalous flowers, variants with a variable number of stamens were most often encountered. Perennial buckwheat in the Republic of Tatarstan was pollinated by wild Hymenoptera and Diptera. The sugariness of perennial buckwheat nectar compared to the selection varieties of buckwheat was insignificant, averaged 0,03 mg of sugar per flower. The fertility of pollen fluctuated within 87,5-96,8%, depending on the weather conditions. The real seed productivity of perennial buckwheat varied from 26,7 to 186,0 seeds per plant. As a result of the study the authors have concluded that perennial buckwheat can be grown in the conditions of the Middle Volga Region as an annual crop.