Abstract
The translocation of heavy metals (HMs) from the rhizosphere to plant systems constitutes a fundamental mechanism governing HM uptake. Microbial augmentation has emerged as a promising strategy to enhance this process. The study investigates the mechanism of enhanced translocation of heavy metals (HMs) from artificially polluted soil to Chrysopogon zizanioides, facilitated by Bacillus xiamenensis VITMSJ3. Pb, Ni, and Cd translocation to the roots and shoots of C. zizanioides was examined, revealing a significant increase of over 15% in HM uptake upon treatment with Bacillus xiamenensis VITMSJ3 (Accession number MT822866). VITMSJ3 exhibited biofilm formation capabilities, attributed to quorum sensing molecule production, and demonstrated resistance to Pb and Ni upto 4000 ppm and Cd upto 450 ppm, respectively. Moreover, VITMSJ3 displayed plant growth-promoting bacterial (PGPB) traits such as, indole-3-acetic acid (IAA), phosphate, ammonia, siderophore, and hydrogen cyanide (HCN) production. Amplification of candidate genes responsible for HM resistance (pbr for Pb, ncc for Ni, cadA for Cd) corroborated the genetic basis of resistance. SEM-EDAX micrographs confirmed HM uptake and translocation along with the presence of VITMSJ3. Enzymatic analysis revealed the synthesis of superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST), peroxidase (POD), and ascorbate peroxidase (APX), implicating their involvement in ROS detoxification. Overall, the study underscores the efficacy of B. xiamenensis VITMSJ3 in enhancing HM translocation, thereby elucidating its potential for phytoremediation applications.
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The authors are thankful to VIT-Vellore, for the assistance throughout the research. We extend our gratitude towards Technology Business Incubator (TBI) for AAS analysis, and SEM facility for the help during sample analysis. The authors would like to thank Dr. Prabavathy from MSSRF-Chennai for providing the reporter strains CVO26 and NTL4.
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MSW: Conceptualization, Experimental designing and implementation, Manuscript writing; SS: Supervision, Validation; JWO: Work plan and Methods, Editing, Compiling data, Communication.
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Wagh, M.S., Sivarajan, S. & Osborne, J.W. Deciphering the enhanced translocation of Pb, Ni and Cd from artificially polluted soil to Chrysopogon zizanioides augmented with Bacillus xiamenensis VITMSJ3. 3 Biotech 14, 180 (2024). https://doi.org/10.1007/s13205-024-04001-x
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DOI: https://doi.org/10.1007/s13205-024-04001-x