Uptake kinetics and accumulation of pesticides in wheat (Triticum aestivum L.): Impact of chemical and plant properties

文献类型： 外文期刊

第一作者： Liu, Qianyu

作者： Liu, Qianyu;Dong, Fengshou;Wu, Xiaohu;Liu, Xingang;Xu, Jun;Zheng, Yongquan;Li, Yuanbo;Liu, Qianyu;Liu, Yingchao;Sallach, J. Brett

作者机构：

关键词： Pesticides; Uptake kinetics; Root lipid content; Translocation; Root concentration factor

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 275 卷

页码：

收录情况： SCI

摘要： Plant uptake is an important process in determining the transfer of pesticides through a food chain. Understanding how crops take up and translocate pesticides is critical in developing powerful models to predict pesticide accumulation in agricultural produce and potential human exposure. Herein, wheat was selected as a model plant species to investigate the uptake and distribution of eleven widely used pesticides in a hydroponic system as a function of time for 144 h. The time-dependent uptake kinetics of these pesticides were fitted with a first-order 1-compartment kinetic model. During 144 h, flusilazole and difenoconazole, with relative high log K-ow (3.87 and 4.36, respectively), displayed higher root uptake rate constants (k). To clarify the role of root lipid content (f(lip)) in plant accumulation of pesticides, we conducted a lipid normalization meta-analysis using data from this and previous studies, and found that the f(lip) value was an important factor in predicting the root concentration factor (RCF) of pesticides. An improved correlation was observed between log RCF and log f(lip)K(ow) (R-2 = 0.748, N = 26, P < 0.001), compared with the correlation between log RCF and log K-ow (R-2 = 0.686, N = 26, P < 0.001). Furthermore, the hydrophilic pesticides (e.g. log K-ow < 2) were found to reach partition equilibrium faster than lipophilic pesticides (e.g. log K-ow > 3) during the uptake process. The quasi-equilibrium factor (alpha(pt)) was inversely related to log K-ow (R-2 = 0.773, N = 11, P < 0.001) suggesting a hydrophobicity-regulated uptake equilibrium. Findings from this study could facilitate crop-uptake model optimization. (C) 2021 Elsevier Ltd. All rights reserved.

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