Niu Zihan, Chen Chao, Ruan Qijun, Duan Yingming, Liu Shuqin, Chen Da
Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment and Climate, Jinan University, Guangzhou 511443, China.
Guangdong Provincial Key Laboratory of Chemical Measurement and Emergency Test Technology, Institute of Analysis, Guangdong Academy of Sciences (China National Analytical Center Guangzhou), Guangzhou 510070, China.
Toxics. 2024 Sep 5;12(9):654. doi: 10.3390/toxics12090654.
Studying the interaction between pesticide contamination in the plant system and the dissolved organic matter (DOM) composition is important to understand the impact of pesticides and plants on the ecological function of DOM. The present study investigated the effects of DOM on the bioaccumulation and biotransformation of carbamates in plants, carbamate exposure on DOM composition, and plant root secretion on the interaction between DOM and carbamates. The concentrations of carbamates and their metabolites in living cabbage plants were continuously tracked through an in vivo analytical method. The presence of DOM was found to reduce the highest bioconcentrations and shorten the time it took to reach the highest bioaccumulated amounts of isoprocarb and carbofuran in plants, while it showed no significant effect on the uptake behavior of carbaryl. DOM profiling results indicated that carbamate exposure substantially decreased the number and molecular diversity of DOM. Notably, plant root secretion alleviated carbamate-induced DOM molecular alterations by inducing a higher turnover rate of DOM compared to that in the uncontaminated group, highlighting the role of plants in mitigating the effects of exogenous pesticide exposure on DOM composition and maintaining DOM molecular homeostasis.
研究植物系统中的农药污染与溶解有机物（DOM）组成之间的相互作用，对于理解农药和植物对DOM生态功能的影响至关重要。本研究调查了DOM对植物中氨基甲酸酯类生物累积和生物转化的影响、氨基甲酸酯暴露对DOM组成的影响，以及植物根系分泌物对DOM与氨基甲酸酯之间相互作用的影响。通过体内分析方法持续跟踪活体甘蓝植株中氨基甲酸酯类及其代谢物的浓度。研究发现，DOM的存在降低了异丙威和克百威在植物中的最高生物浓缩系数，并缩短了达到最高生物累积量所需的时间，而对西维因的吸收行为没有显著影响。DOM分析结果表明，氨基甲酸酯暴露显著降低了DOM的数量和分子多样性。值得注意的是，与未受污染组相比，植物根系分泌物通过诱导更高的DOM周转率，减轻了氨基甲酸酯诱导的DOM分子变化，突出了植物在减轻外源农药暴露对DOM组成的影响以及维持DOM分子稳态方面的作用。
