Pedosphere 32(1): 198--210, 2022
ISSN 1002-0160/CN 32-1315/P
©2022 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Biosurfactant-assisted phytoremediation of potentially toxic elements in soil: Green technology for meeting the United Nations Sustainable Development Goals
Songita SONOWAL1, Amy R. NAVA2, Sanket J. JOSHI3, Siddhartha Narayan BORAH4, Nazim F. ISLAM5, Soumya PANDIT6, Ram PRASAD1, Hemen SARMA5
1Department of Botany, School of Life Sciences, Mahatma Gandhi Central University, Motihari 845401(India)
2Department of Molecular&Cellular Physiology, Stanford University, Stanford, CA 94305(USA)
3Oil&Gas Research Center, Central Analytical and Applied Research Unit, Sultan Qaboos University, Muscat 123(Oman)
4Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039(India)
5Institutional Biotech Hub(IBT Hub), Department of Botany, Nanda Nath Saikia College, Titabar 785630(India)
6Department of Life Sciences, School of Basic Sciences and Research, Sharda University, Greater Noida 201306(India)
ABSTRACT
      Biosurfactants are biomolecules produced by microorganisms, low in toxicity, biodegradable, and relatively easy to synthesize using renewable waste substrates. Biosurfactants are of great importance with a wide and versatile range of applications, including the bioremediation of contaminated sites. Plants may accumulate soil potentially toxic elements (PTEs), and the accumulation efficacy may be further enhanced by the biosurfactants produced by rhizospheric microorganisms. Occasionally, the growth of bacteria slows down in adverse conditions, such as highly contaminated soils with PTEs. In this context, the plant's phytoextraction capacity could be improved by the addition of metal-tolerant bacteria that produce biosurfactants. Several sources, categories, and bioavailability of PTEs in soil are reported in this article, with the focus on the cost-effective and sustainable soil remediation technologies, where biosurfactants are used as a remediation method. How rhizobacterial biosurfactants can improve PTE recovery capabilities of plants is discussed, and the molecular mechanisms in bacterial genomes that support the production of important biosurfactants are listed. The status and cost of commercial biosurfactant production in the international market are also presented.
Key Words:  bacterial genome,metal-tolerant bacteria,phytoextraction technology,plant growth-promoting rhizobacteria,rhizospheric microorganism
Citation: Sonowal S, Nava A R, Joshi S J, Borah S N, Islam N F, Pandit S, Prasad R, Sarma H. 2022. Biosurfactant-assisted phytoremediation of potentially toxic elements in soil: Green technology for meeting the United Nations Sustainable Development Goals. Pedosphere. 32(1): 198–210.
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