From Water to Water: Insight into the Translocation of Pesticides from Plant Rhizosphere Solution to Leaf Guttation and the Associated Ecological Risks

文献类型： 外文期刊

第一作者： Xia, Beiqi

作者： Xia, Beiqi;Wang, Sijia;Li, Runan;Dong, Fengshou;Li, Yuanbo;Zheng, Yongquan

作者机构：

关键词： plant guttation; pesticides; neonicotinoids; plant uptake; translocation; ecological risks

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：11.4； 五年影响因子：12.0 ）

ISSN： 0013-936X

年卷期： 2024 年 58 卷 17 期

页码：

收录情况： SCI

摘要： Plant guttation is an important source of water/nutrients for many beneficial insects, while the presence of pesticides in guttation has been considered as a new exposure route for nontarget insects. This study aimed to elucidate how 15 diverse pesticides are translocated from growth media to guttation by maize plants through a hydroponic experiment. All pesticides were effectively translocated from the growth solution to maize guttation and reached a steady state within 5 days. The strong positive correlation (R-2 = 0.43-0.84) between the concentrations of pesticides in guttation and in xylem sap demonstrated that xylem sap was a major source of pesticides in guttation. The relationship between the bioaccumulation of pesticides in guttation (BCFguttation) and the chemical K-ow was split into two distinct patterns: for pesticides with log K-ow > 3, we identified a good negative linear correlation between log BCFguttation and log K-ow (R-2 = 0.71); however, for pesticides with log K-ow < 3, all data fall close to a horizontal line of BCFguttation congruent to 1, indicating that hydrophilic pesticides can easily pass through the plants from rhizosphere solution to leaf guttation and reach saturation status. Besides, after feeding with pesticide-contaminated guttation, the mortality of honeybees was significantly impacted, even at very low levels (e.g., & sum;600 mu g/L with a mortality of 93%). Our results provide essential information for predicting the contamination of plant guttation with pesticides and associated ecological risks.

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