数字农科院2.0

Insight into the fate of tolfenpyrad in tea plant (Camellia sinensis L.) from root uptake

文献类型： 外文期刊

作者： Zihan Wang;Xinru Wang;Ziqiang Li;Min Wang;Wenwen Fan;Chengmin Zha;Li Zhou;Xinzhong Zhang;Zongmao Chen;Fengjian Luo

作者机构：

关键词： Distribution;Metabolism;Root uptake;Tea plant;Tolfenpyrad;Transport

期刊名称： Science of the Total Environment

ISSN： 0048-9697

年卷期： 2024 年 950 卷

页码：

收录情况： SCIE（2024版） ; ; EI（2024版）

摘要： Residual pesticides in agricultural environments, including soil and irrigation water, can be taken up by plants, and thus pose a potential risk to food safety. Although tolfenpyrad has been widely used in tea plantations, limited information is available on its root uptake and fate in tea plants (Camellia sinensis L.). Exploring the mechanisms involved is crucial for understanding the migration and accumulation of tolfenpyrad in tea plants, particularly in the edible parts. In this study, root uptake of tolfenpyrad and its subsequent translocation, distribution, and metabolism in tea seedlings were investigated. The results indicated that the passive transport and apoplastic pathway dominated the root uptake of tolfenpyrad. After uptake, tolfenpyrad distributed predominantly in the cell walls (90.8–92.0 %) of roots, resulting in limited upward translocation in water-soluble fractions through transpirational pull, with translocation factor values far <1 (TFstem/root = 0.115–0.453 and TFleaf/stem = 0.039–0.184). Similar accumulation patterns were observed for the carboxylated metabolite PT-CA as well as hydroxylated metabolite PT-OH. Interestingly, the subcellular distribution of PT-CA in stems was much different from that of the parent tolfenpyrad: PT-CA mainly distributed in the stem cell walls (41.72 %) and cell organelles (56.18 %) at 3 h, then gradually transferred into the cell-soluble fractions (33.07 %) after 120 h. Results from the present study indicated limited upward translocation of tolfenpyrad with its main metabolites to leaves. This finding helps to alleviate concerns about environmental residual tolfenpyrad in tea consumption and provides valuable information for the safety evaluation of tolfenpyrad.

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