Influence of rhizospheric microbial inoculation and tolerant plant species on the rhizoremediation of lindane
2011
Abhilash, P.C. | Srivastava, Shubhi | Srivastava, Pankaj | Singh, Bindu | Jafri, Amina | Singh, Nandita
Application of rhizospheric microbes to enhance the phytoremediation of organic pollutants has gained considerable attention recently due to their beneficial effects on the survival and growth of plants in contaminated soil sites. The present study was demonstrated to test the combined rhizoremediation potential of Staphylococcus cohnii subspecies urealyticus in the presence of tolerant plant Withania somnifera grown in lindane spiked soil. Withania was grown in garden soil spiked with 20mgkg⁻¹ of lindane and inoculated with 100ml of microbial culture (8.1×10⁶CFU). Effect of microbial inoculation on plant growth, lindane uptake, microbial biomass carbon, dehydrogenase activity, residual lindane concentration and lindane dissipation percentage were analyzed. The microbial inoculation significantly enhances the growth and lindane uptake potential of test plant (p<0.05). Furthermore, there was an enhanced dissipation of lindane observed in microbial inoculated soil than the dissipation rate in non-inoculated soil (p<0.01) and the dissipation rate was positively correlated with the soil dehydrogenase activity and microbial biomass carbon (p<0.05). The study concludes that the integrated use of tolerant plant species and rhizospheric microbial inoculation can enhance the dissipation of lindane, and have practical application for the in situ remediation of contaminated soils.
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