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Related Experiment Video

Updated: Apr 23, 2026

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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Root-Driven Reactive Oxygen Species Controls Multidimensional Arsenic Speciation in the Rice Rhizosphere.

Xing Liu1, Longgang Chu1, Haiyi Chen1

  • 1State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing210023, P. R. China.

Environmental Science & Technology
|April 21, 2026
PubMed
Summary
This summary is machine-generated.

Reactive oxygen species (ROS) significantly influence arsenic speciation in rice paddy soils, impacting food safety. This study reveals ROS hotspots correlate with reduced arsenic(III) levels in the rhizosphere.

Keywords:
arsenic speciesin situ spatial distributionreactive oxygen speciesrhizosphere microenvironment

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Area of Science:

  • Environmental Science
  • Soil Science
  • Biogeochemistry

Background:

  • Arsenic contamination in agroecosystems threatens food security and human health.
  • Understanding arsenic speciation in wetland rhizospheres is crucial, but microscale drivers remain unclear.
  • The role of abiotic factors like reactive oxygen species (ROS) in arsenic transformations is underexplored.

Purpose of the Study:

  • To investigate the microscale distribution of arsenic speciation and its relationship with environmental parameters in rice rhizospheres.
  • To determine the role of reactive oxygen species (ROS) in regulating arsenic speciation in paddy soils.
  • To elucidate the interplay between abiotic and biotic factors in controlling arsenic transformations.

Main Methods:

  • Utilized high-resolution in situ techniques to map arsenic(III)/arsenic(V) and environmental parameters.
  • Developed a novel ratiometric fluorescent approach for in situ ROS visualization.
  • Integrated imaging with functional gene analysis, sterilization, ROS-quenching experiments, and structural equation modeling.

Main Results:

  • Strong spatial correlation observed between ROS hotspots and decreased arsenic(III) (R2 = 0.797).
  • ROS influence on arsenic speciation was more significant than that of O2 (R2 = 0.348).
  • ROS-driven processes were identified as crucial regulators of arsenic speciation in the studied rice rhizospheres.

Conclusions:

  • Reactive oxygen species (ROS) play a critical role in regulating arsenic speciation in rice paddy soils.
  • Findings provide new insights into coupled abiotic-biotic processes governing arsenic behavior in rhizosphere environments.
  • While ROS are key, microbial contributions to arsenic transformations cannot be excluded.