New Agronomically Valuable Strains of the Genus Streptomyces and Their Biochemical Characteristics

Organic farming is a global trend that increases the demand for biological preparations for use in agricultural production. The paper characterizes new actinomycete isolates from soil samples taken in various agrocenoses of the Vyatka-Kama Urals. As a result of preliminary testing (about 350 strains), strains 8Al3, N27-25 and P15-2 were isolated on the basis of antifungal activity. The cultures were identified by 16S rRNA as bacteria of the genus Streptomyces. The active substance with antifungal effect — scopafungin was identified using HPLC-MS/MS. Along with the inhibitory effect on phytopathogenic fungi, these strains produce auxins in the presence of 100 mcg/ml of L-tryptophan (17.4–20.8 mcg/ml), have cellulolytic activity and have a stimulating effect on germination and accumulation of dry biomass by wheat, clover and mustard seedlings. Possessing a complex of beneficial properties for plants, Streptomyces strains 8Al3, N27-25 and P15-2 can be used as candidates for the creation of biological preparations with fungicidal and phytostimulating effects.