首页|Ecological adaptation of antimony-oxidizing bacteria (SbOB) drives habitat-specific bioremediation potential

Ecological adaptation of antimony-oxidizing bacteria (SbOB) drives habitat-specific bioremediation potential

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Antimony-oxidizing bacteria (SbOB) play vital roles in Sb detoxification, yet their environmental adaptation mechanisms remain unclear. Through comparative analysis of Sb-contaminated groundwater and soil ecosystems in Xikuangshan mining area, we revealed striking habitat-driven divergence in SbOB survival strategies, focusing on community diversity, ribosomal RNA operon (rrn) copies, niche breadth, and gene profiles. Results showed that SbOB markedly enhanced alpha-diversity in groundwater but minimally affected soil communities. Taxonomically, Hydrogenophaga, Pseudomonas, and Aeromonas prevailed in groundwater, whereas Acidobacteria, Chloroflexi, and Gemmatimonadaceae dominated soil ecosystems. Genomic traits revealed groundwater SbOB uniquely linked Sb oxidation (aioA) and metabolic pathways for sulfur oxidation (soxB), CO2 fixation (cbbL), and N2 fixation (nifH), enabling versatile energy acquisition. These taxa demonstrated rapid responses to fluctuating organic inputs via higher rrn copies, expanding their niche through autotrophy. Additionally, oxidative stress tolerance genes enabled them to thrive under oxygen fluctuations in groundwater. Conversely, soil SbOB with lower rrn copies prioritized antibiotic resistance for niche competition. These findings establish a habitat-specific framework for Sb bioremediation. Groundwater SbOB consortia, with their multifunctional metabolic toolkit, are prime candidates for engineering bioaugmentation systems to simultaneously detoxify Sb(III) and mitigate cocontaminants (e.g., sulfides, nitrate) in mining-impacted aquifers.

Antimony pollutionOxidative detoxificationGenetic trade-offEnvironmental adaptationSOILSENVIRONMENTCOMMUNITIESSPECIATION

Wang, Weiqi、Zhang, Xinyue、Li, Min、Liu, Xiaoyan、Yang, Kang、Tuovinen, Olli H.、Wang, Hongmei

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China Univ Geosci||Zhejiang Univ||Zhejiang University Department of Environmental Engineering

China Univ Geosci

The Ohio State University Department of Microbiology

China Univ Geosci||China Univ Geosci

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2025

Environmental pollution

Environmental pollution

SCI
ISSN:0269-7491
年,卷(期):2025.380(Sep.1)
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