Pedosphere 35(1): 249--263, 2025
ISSN 1002-0160/CN 32-1315/P
©2025 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Mechanisms of microbe-assisted metal tolerance in phytoremediators: A review |
Swati SACHDEV1, Chetan KESWANI2, Tatiana MINKINA2, Kuldeep BAUDDH3 |
1 Department of Liberal Education, Era University, Lucknow 226003 (India);
2 Academy of Biology and Biotechnology, Southern Federal University, Rostov-on-Don 44090 (Russia);
3 Institute of Environment and Sustainable Development, Rajiv Gandhi South Campus (RGSC), Banaras Hindu University, Barkachha, Mirzapur 231001 (India) |
| ABSTRACT |
| Escalating anthropogenic activities have caused heavy metal contamination in the environmental matrices. Due to their recalcitrant and toxic nature, their occurrence in high titers in the environment can threaten survival of biotic components. To take the edge off, remediation of metal-contaminated sites by phytoremediators that exhibit a potential to withstand heavy metal stress and quench harmful metals is considered an eco-sustainable approach. Despite the enormous potential, phytoremediation technique suffers a setback owing to high metal concentrations, occurrence of multiple pollutants, low plant biomass, and soil physicochemical status that affect plants at cellular and molecular levels, inducing morphological, physiological, and genetic alterations. Nevertheless, augmentation of soil with microorganisms can alleviate the challenge. A positive nexus between microbes, particularly plant growth-promoting microorganisms (PGPMs), and phytoremediators can prevent phytotoxicity and augment phytoremediation by employing strategies such as production of secondary metabolites, solubilization of phosphate, and synthesis of 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase and phytohormones. Microbes can mediate tolerance in plants by fortifying their antioxidant machinery, which maintains redox homeostasis and alleviates metal-induced oxidative damage in the plants. Associated microbes can also activate stress-responsive genes in plants and abridge metal-induced toxic effects. An in-depth exploration of the mechanisms employed by plant-associated microbes to trigger tolerance in phytoremediators is crucial for improving their phytoremediation potential and real-world applications. The present article attempts to comprehensively review these mechanisms that eventually facilitate the development of improved/new technology for soil ecosystem restoration. |
| Key Words: biosorption,chelation,microbial metabolites,oxidative stress,phytoextraction,phytostabilization,root exudates |
| Citation: Sachdev S, Keswani C, Minkina T, Bauddh K. 2025. Mechanisms of microbe-assisted metal tolerance in phytoremediators: A review. Pedosphere. 35(1): 249-263. |
|
查看全文 |
|
|
|
