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<p>Understanding the role of chelating agents on Cd bioavailability is key for assessing risks and guiding remediation in Cd-contaminated soils. Effects of three common chelating agents on Cd availability to microorganisms and plants were investigated using solution with similar Cd species profiles. As indicated by a Cd-inducible <i>Escherichia coli</i> biosensor, citric acid, nitrilotriacetic acid, and N,N-bis(carboxymethyl)glutamic acid (GLDA) significantly enhanced microbial Cd availability, with fluorescence intensities adjusted to OD<sub>600</sub> increasing by 1.50–1.71, 1.78–1.87, and 1.69–2.10 times. But these agents caused comparable or diminished Cd accumulation in <i>Sedum plumbizincicola</i>, with GLDA causing a 67.7% decrease. Microorganisms with sulfhydryl-rich ligands effectively compete with chelating agents for Cd, unlike less competitive ligands of roots. Thus variations in Cd bioavailability stem from different biological ligands on biological surfaces and secreted by microorganisms and plants, affecting surface interactions and metal speciation. This highlights the role of biological ligands in determining Cd availability.</p>

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Different Impacts of Chelating Agents on Cd Bioavailability in Microbes and Plants

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Xinying Wang,
  • Wenyao Tang,
  • Dandan Cao,
  • Yingying Guo,
  • Qiang Dong,
  • Guangliang Liu,
  • Yanwei Liu,
  • Yongguang Yin,
  • Yong Cai,
  • Guibin Jiang

摘要

Understanding the role of chelating agents on Cd bioavailability is key for assessing risks and guiding remediation in Cd-contaminated soils. Effects of three common chelating agents on Cd availability to microorganisms and plants were investigated using solution with similar Cd species profiles. As indicated by a Cd-inducible Escherichia coli biosensor, citric acid, nitrilotriacetic acid, and N,N-bis(carboxymethyl)glutamic acid (GLDA) significantly enhanced microbial Cd availability, with fluorescence intensities adjusted to OD600 increasing by 1.50–1.71, 1.78–1.87, and 1.69–2.10 times. But these agents caused comparable or diminished Cd accumulation in Sedum plumbizincicola, with GLDA causing a 67.7% decrease. Microorganisms with sulfhydryl-rich ligands effectively compete with chelating agents for Cd, unlike less competitive ligands of roots. Thus variations in Cd bioavailability stem from different biological ligands on biological surfaces and secreted by microorganisms and plants, affecting surface interactions and metal speciation. This highlights the role of biological ligands in determining Cd availability.