Soil Mechanisms of Reducing uptake of Cadmium by Barley Plants with Application of Rhizosphere Bacteria Stimulating Plant Growth
In the pot experiment the effects of plant growth-promoting rhizobacteria of the genus Pseudomonas on the growth, elemental chemical composition of barley plants and the composition of cadmium compounds were studied in an artificially contaminated with heavy metal gray forest soil. Application of the effective bacteria P. fluorescens 21 significantly reduced the untake of Cd by vegetative mass and roots of plants at the heading stage. The positive effect of this bacterium was associated with the strengthening of barrier functions of soils in relation to Cd due to the sequestration of the metal in relatively stable complexes and organic compounds in the first half of the growing season. In the absence of negative influence of Cd contamination of soil on plant growth introduction bacteria of the genus Pseudomonas in uncontaminated soils did not have a significant effect on biomass of plants contaminated with heavy metal, despite the decrease in the concentrations of P, Fe and micronutrients Zn, Mn and Cu in different plant organs.