STUDY OF ACTINOBACTERIA IN SALINE SOILS OF THE ARID ZONE

Grigoryan Lilit Norayrovna  -  candidate of biological sciences, leading researcher of the scientific laboratory of biotechnology, Federal State Budgetary Educational Institution of Higher Education "Astrakhan State University named by V.N. Tatishchev", Russia, 414056, Astrakhan, st. Tatishcheva, 20a, lilyagrigoryan90@gmail.com

Batayeva Yulia Viktorovna  -  doctor of biological sciences, docent , Leading Researcher, Department of Biological Technologies, Federal State Budgetary Educational Institution Higher Education Astra-khan State University Russian State Agrarian University - MTAA named after K.A. Timiryazev, Russia, 127550, Moscow, st. Timiryazevskaya, 49, aveatab@mail.ru

Rusakov Alexander Vyacheslavovich  -  student, Federal State Budgetary Educational Institution Higher Education Astra-khan State University Russian State Agrarian University - MTAA named after K.A. Timiryazev, Russia, 127550, Moscow, st. Timiryazevskaya, 49,

The study involved 23 samples of alluvial meadow, brown semi-desert, alluvial sod, and light chestnut soils with varying degrees of salinity (dry residue from 0.3% to 2.9%). The physiological groups revealed included heterotrophs, including microorganisms capable of assimilating high (saprotrophs) and low (oligotrophs) concentrations of organic matter. These included microscopic fungi and bacteria, including actinobacteria. A comparative analysis of the quantitative composition of microorganisms, obtained by inoculating soil dilutions onto solid nutrient media, showed that the maximum number of microorganisms was observed on the starch-casein medium, which was an order of magnitude higher than the number of microorganisms isolated on other nutrient media. As a result, 3 isolates (No. 2, No. 11, No. 18) were selected that showed high phytostimulating activity.

Key words: microbiota, soil microorganisms, degraded soils, arid zone, phytostimulating activity.