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Volume 14
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10.3390/toxics14070615
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Article

Physicochemical and Microbial Regulation Inhibit Rice Mercury Accumulation in the Karst Region with High Geological Background

by
Yanxin Hu
1,2,
Zhengcheng Song
2,
Lu Qiao
1,2,
Xinyu Liang
2,3,
Shaochen Yang
2,
Junyao Yan
2,
Langfei Wei
2,3,
Jinjuan Li
1 and
Ping Li
2,*
1
College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
2
Laboratory of Karst Environmental Evolution and Ecological Security, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3
University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Toxics 2026, 14(7), 615; https://doi.org/10.3390/toxics14070615
Submission received: 16 June 2026 / Revised: 8 July 2026 / Accepted: 13 July 2026 / Published: 15 July 2026
(This article belongs to the Topic Soil/Sediment Remediation and Wastewater Treatment)
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Abstract

Methylmercury (MeHg) accumulation in rice is a major source of human MeHg exposure in some inland areas, yet the mechanism controlling mercury (Hg) accumulation in high geological background (HGB) regions remains poorly understood. Here, a field-scale remediation experiment was conducted in a karst HGB region of Guizhou, China, using a synergistic strategy combining selenium foliar spraying and calcium oxide-based soil conditioner. The combined treatment reduced total Hg and MeHg concentrations in rice grains by 63.0% and 80.0%, respectively. The root uptake from the soil–water system was found to be the primary pathway controlling Hg transfer into rice grain. Mechanistically, the soil conditioner increased soil pH and reduced bioavailable Hg, porewater Hg, and soil MeHg by 53.6%, 59.8%, and 62.6%, respectively, whereas selenium foliar spraying promoted Hg–Se complexation and reduced Hg mobility in the paddy system. In parallel, the combined treatment suppressed Hg-methylating microorganism (e.g., Geobacter decreased by 65%) and hgcAB gene (hgcA: −65%; hgcB: −58%), while enriching Hg-resistant taxa and merA-mediated detoxification pathway. These coupled physicochemical and microbial processes substantially reduced Hg bioavailability, MeHg production, and Hg bioaccumulation in rice grain of the paddy ecosystem, providing an effective strategy for mitigating Hg-related food safety risk in the karst HGB region.
Keywords: mercury; high geological background; rice; remediation; microbial regulation mercury; high geological background; rice; remediation; microbial regulation

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MDPI and ACS Style

Hu, Y.; Song, Z.; Qiao, L.; Liang, X.; Yang, S.; Yan, J.; Wei, L.; Li, J.; Li, P. Physicochemical and Microbial Regulation Inhibit Rice Mercury Accumulation in the Karst Region with High Geological Background. Toxics 2026, 14, 615. https://doi.org/10.3390/toxics14070615

AMA Style

Hu Y, Song Z, Qiao L, Liang X, Yang S, Yan J, Wei L, Li J, Li P. Physicochemical and Microbial Regulation Inhibit Rice Mercury Accumulation in the Karst Region with High Geological Background. Toxics. 2026; 14(7):615. https://doi.org/10.3390/toxics14070615

Chicago/Turabian Style

Hu, Yanxin, Zhengcheng Song, Lu Qiao, Xinyu Liang, Shaochen Yang, Junyao Yan, Langfei Wei, Jinjuan Li, and Ping Li. 2026. "Physicochemical and Microbial Regulation Inhibit Rice Mercury Accumulation in the Karst Region with High Geological Background" Toxics 14, no. 7: 615. https://doi.org/10.3390/toxics14070615

APA Style

Hu, Y., Song, Z., Qiao, L., Liang, X., Yang, S., Yan, J., Wei, L., Li, J., & Li, P. (2026). Physicochemical and Microbial Regulation Inhibit Rice Mercury Accumulation in the Karst Region with High Geological Background. Toxics, 14(7), 615. https://doi.org/10.3390/toxics14070615

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