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

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Bulletin of Environmental Contamination and Toxicology Pub Date : 2025-06-02 DOI:10.1007/s00128-025-04063-4

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

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Abstract

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.

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螯合剂对微生物和植物中Cd生物利用度的影响

了解螯合剂对Cd生物利用度的作用是评估Cd污染土壤风险和指导修复的关键。研究了三种常用螯合剂对微生物和植物Cd有效性的影响。Cd诱导型大肠杆菌生物传感器显示，柠檬酸、硝基三乙酸和N，N-二（羧甲基）谷氨酸（GLDA）显著提高了微生物Cd的利用度，调整到OD600的荧光强度分别提高了1.50 ~ 1.71倍、1.78 ~ 1.87倍和1.69 ~ 2.10倍。但这些药物对Sedum plumbizincicola的Cd积累有相当或减少的作用，GLDA使其减少67.7%。具有富巯基配体的微生物与螯合剂有效地竞争Cd，不像根的不那么竞争的配体。因此，Cd生物利用度的变化源于生物表面上不同的生物配体，并由微生物和植物分泌，影响表面相互作用和金属物种形成。这突出了生物配体在决定Cd可用性中的作用。

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来源期刊

Bulletin of Environmental Contamination and Toxicology 环境科学-毒理学

CiteScore

5.60

自引率

3.70%

发文量

230

审稿时长

1.7 months

期刊介绍： The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.