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Plant-associated Microbe System in Treatment of Heavy Metals–contaminated Soil: Mechanisms and Applications

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Abstract

Owing to the ecological applicability, phytoremediation has attracted extensive attention in the remediation of heavy metals–contaminated soil, but the slow plant growth and low remediation efficiency limit its application. Recently, the developed plant-associated microbes has opened up promising areas of research in the field of phytoremediation technology. Various plant growth–promoting rhizobacterias (PGPR) are suggested to be involved in the phytoremediation of heavy metals–contaminated soils, thereby significantly enhancing the removal efficiency of heavy metals. Currently, the published reviews focus on the resistance mechanism of plants and microorganisms to heavy metals, but the function and regulatory machinery of PGPR on phytoremediation have been overlooked. This paper will give a critical review on the processes of PGPR in phytoremediation, including both direct and indirect mechanisms such as (i) the secretion of siderophores, organic acids, biosurfactants, and redox processes and (ii) stimulating plant growth or enhancing their resistance via N fixation, P solubilization, and phytohormone and aminocyclopropane-1-carboxylic acid deaminase synthesis. Moreover, the development of PGPR in phytoremediation is prospected. This work would help readers and researchers better understand the principle and application of PGPR in promoting phytoremediation heavy metals–contaminated soil.

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Funding

This work was supported by the National key research and development plans of special project for site soils (2018YFC1800600), the National Key R&D Program of China, High efficient Development and Utilization of Water Resource (2019YFC0408202), the National Natural Science Foundation of China (NSFC) (21876050), Shanghai Rising-Star Program (19QB1405300).

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Authors and Affiliations

  1. National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai, 200237, China

    Zhiming Ren, Rui Cheng, Peng Chen, Yuanyuan Xue, Hong Xu, Guangtuan Huang, Wei Zhang & Lehua Zhang

  2. Shanghai Municipal Engineering Design Institute (Group) Co. Ltd, Shanghai, 200092, China

    Yao Yin

  3. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control On Chemical Process, East China University of Science and Technology, Shanghai, 200237, China

    Guangtuan Huang, Wei Zhang & Lehua Zhang

  4. Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China

    Wei Zhang & Lehua Zhang

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  1. Zhiming Ren
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Highlights

1. Application of plant-associated microbes has opened up promising areas of phytoremediation technology.

2. Various PGPR are involved in the enhancing the removal efficiency of heavy metals in soil.

3. Further research on the application of PGPR in phytoremediation is prospected.

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Ren, Z., Cheng, R., Chen, P. et al. Plant-associated Microbe System in Treatment of Heavy Metals–contaminated Soil: Mechanisms and Applications. Water Air Soil Pollut 234, 39 (2023). https://doi.org/10.1007/s11270-023-06061-w

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