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Interplay between vanadium distribution and microbial community in soil-plant system.

Han Zhang1, Shu Cheng2, Wenyue Yan2

  • 1School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing 100083, China.

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PubMed
Summary

This study reveals how vanadium (V) affects soil microbes and plants near a V smelter. Specific bacteria help plants absorb and detoxify vanadium, offering strategies for contaminated site remediation.

Keywords:
EndosphereMetagenomicsRhizosphereSoil-plant systemVanadium biogeochemistry

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Area of Science:

  • Environmental Science
  • Microbiology
  • Biogeochemistry

Background:

  • Vanadium (V) distribution and transformation are crucial in soil-plant systems, influencing microbial diversity and plant uptake.
  • Limited understanding exists regarding microbial responses to V stress across different soil-plant compartments and the metabolic pathways involved.

Purpose of the Study:

  • To investigate V distribution in soil-plant systems near a V smelter.
  • To reveal microbial adaptation and V transformation processes in bulk soil, rhizosphere, and endosphere.
  • To identify metabolic functions driving V transformation and plant V uptake.

Main Methods:

  • 16S rRNA sequencing and metagenomics were employed to analyze microbial communities and functions.
  • Analysis of V distribution and environmental variables (pH, OM, AP) in soil and plant tissues.
  • Phytoextraction potential of Bothriochloa ischaemum (L.) Keng. (BK) was assessed.

Main Results:

  • Bothriochloa ischaemum (BK) showed significant phytoextraction potential (TF = 0.74 ± 0.26).
  • Environmental factors significantly influenced soil community composition, with distinct assembly processes in bulk soil, rhizosphere, and endosphere.
  • Metagenomics identified coordinated metabolic pathways for V uptake and translocation, with specific microbes mitigating V stress through reduction and complexation.

Conclusions:

  • Microbial communities in soil and plant compartments play a coordinated role in V uptake, translocation, and detoxification.
  • Specific bacteria like Nocardioide, Microvirga, Solirubrobacter, and Enterobacter possess genes for V reduction, complexation, and detoxification.
  • Findings provide insights for developing mitigation strategies for vanadium-contaminated sites.