[Biodegradation of phenanthrene by Pseudomonas bacteria bearing rhizospheric plasmids in model plant-microbial associations].

The consumption phenanthrene in soil by model plant-microbial associations including natural and transconjugant plasmid-bearing rhizospheric strains of Pseudomonas fluorescens and P. aureofaciens degrading polycyclic aromatic hydrocarbons was studied. It was shown that phytoremediation of soil polluted with phenanthrene in the rhizosphere of barley (Hordeum sativum L.) was inefficient with the absence of the degrading strains. Inoculation of barley seeds with both natural and transconjugant plasmid-bearing Pseudomonas strains able to degrade polycyclic aromatic hydrocarbons (PAH) protected plants from the phytotoxic action of phenanthrene and favored its degradation in soil. Rape (Brassica napus L.) was shown to be an appropriate sentinel plant, sensitive to phenanthrene, which can be used for testing the efficiency of phenanthrene degradation in soil. The biological test with the use of sensitive rape plants can be applied for estimation of the efficiency of phyto/bioremediation of PAH-polluted soils.