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Microbial and plant-assisted heavy metal remediation in aquatic ecosystems: a comprehensive review

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Abstract

Heavy metal (HM) pollution in aquatic ecosystems has an adverse effect on both aquatic life forms as well as terrestrial living beings, including humans. Since HMs are recalcitrant, they accumulate in the environment and are subsequently biomagnified through the food chain. Conventional physical and chemical methods used to remove the HMs from aquatic habitats are usually expensive, slow, non-environment friendly, and mostly inefficient. On the contrary, phytoremediation and microbe-assisted remediation technologies have attracted immense attention in recent years and offer a better solution to the problem. These newly emerged remediation technologies are eco-friendly, efficient and cost-effective. Both phytoremediation and microbe-assisted remediation technologies adopt different mechanisms for HM bioremediation in aquatic ecosystems. Recent advancement of molecular tools has contributed significantly to better understand the mechanisms of metal adsorption, translocation, sequestration, and tolerance in plants and microbes. Albeit immense possibilities to use such bioremediation as a successful environmental clean-up technology, it is yet to be successfully implemented in the field conditions. This review article comprehensively discusses HM accumulation in Indian aquatic environments. Furthermore, it describes the effect of HMs accumulation in the aquatic environment and the role of phytoremediation as well as microbe-assisted remediation in mitigation of the HM toxicity. Finally, the review concludes with a note on the challenges, opportunities and future directions for bioremediation in the aquatic ecosystems.

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Acknowledgements

This work was supported by an extramural grant [BT(Estt)/RD-3/2014] from the Department of Biotechnology, West Bengal, India, and a research grant of Ramanujan Fellowship from Science and Engineering Research Board (SERB), India (SR/S2/RJN-106/2012) to AG. SH would like to thank Asutosh College, University of Calcutta for financial support.

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AG conceived the idea. SH and AG wrote and revised the manuscript.

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Correspondence to Abhrajyoti Ghosh.

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The authors declare that there is no conflict of interest.

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Haldar, S., Ghosh, A. Microbial and plant-assisted heavy metal remediation in aquatic ecosystems: a comprehensive review. 3 Biotech 10, 205 (2020). https://doi.org/10.1007/s13205-020-02195-4

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  • DOI: https://doi.org/10.1007/s13205-020-02195-4

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