Pareniuk O. Particularities of microcenosis formation on the radionuclide-contaminated soil and ways of rhizosphere microflora influence on the 137Cs accumulation by plants

Species composition of bacteria from exclusion zone and zone of unconditional (obligatory) resettlement of the Chernobyl nuclear power plant contaminated soil were analyzed. Dominant species were determined. It is shown that the intensity of cellulolytic activity of soil microorganisms in ecosystems is stable over time, indicating a high buffering capacity of soil. It was shown that the strain Bacillus megaterium UKM B-5724 from the collection of the Institute of Microbiology and Virology of NASU has a high ability to accumulate radionuclides. It was found that certain types of microorganisms can either reduce or increase the ratio of 137Cs transfer from the substrate to the plant. It is shown that this property is independent of the localization of the microorganism on the surface of the root, for all analyzed bacteria belong to the rhizospheric group. Azotobacter chroococcum UKM B-6003-20A stimulated the radionuclide transfer to plants up to 1.5 times, while the best bacteria for reducing its accumulation is Burkholderia sp IMER-B1-53 - 1.3 times in comparison with the control.