Bioremediation of Ni (II) cation-contaminated soils by bacteria

The interaction of plant growth-promoting bacteria with plants and their ability to clean up contaminated soil has attracted more attention in recent years. In this study, three rhizobacteria strains (Enterobacter ludwigi, Enterobacter cloacae, and Pseudomonas aeruginosa) were examined to determine their individual and combined synergistic effects on the remediation of Ni -contaminated soils. Wheat was used as a test plant. Wheat seedlings were sown in soils containing 57.42, 95.7, and 191.4 mg/kg of nickel and were then given a 30-day treatment with a mixture of the rhizosphere bacteria Enterobacter ludwigi, Enterobacter cloacae, and Pseudomonas aeruginosa. Next, plant height, biomass in the stems and roots, and chlorophyll content were measured. It was discovered that plant growth characteristics were greatly improved when a consortium of three bacterial strains was used as opposed to the outcome when only one strain was used. The outcomes demonstrated the potential for synergistic bioremediation of Ni-contaminated soils and enhancement of plant development among the studied rhizobacteria. The findings of this study offer solid evidence in using an inexpensive, highly efficient microorganism-based bioremediation for soils contaminated with nickel.

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