Rhizosphere Bacteria of the Genus Pseudomonas from Oil-Contaminated Soils as a Basis for Biopreparations in Phytoremediation

New Pseudomonas spp. strains with phytostimulating properties were isolated from the rhizosphere of wild grasses growing in oil-contaminated sites. The strains grew at temperatures ranging from 6 to 37°C, in the presence of 3–5% NaCl and 2–3 mM Ni, Cd, Cu, and Zn. Eight isolates exhibited phosphate-mobilizing activity. Four strains–antagonists of soil phytopathogens were found to have genes required for the biosynthesis of 2,4-diacetylphloroglucinol and pyrrolnitrin, and one strain had genes for phenazine-1-carboxylic acid. In microvegetation experiments, six strains increased wheat biomass by 8–20% compared to the non-inoculated control. The selected cultures can be recommended as a basis for biopreparations aimed at plant protection and growth stimulation, including use in soils contaminated with petroleum products.