Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China.
Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China; Institute of Food Quality and Safety, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China.
Ecotoxicol Environ Saf. 2019 Nov 15;183:109488. doi: 10.1016/j.ecoenv.2019.109488. Epub 2019 Jul 31.
The extensive application of pesticides in agricultural activities has raised increasing concerns on crop contamination by pesticide residues. Vegetables seem more susceptible to pesticide contamination given the high-intensive application of pesticides during their entire growth, while information about transfer and cell diffusion characteristics of pesticides in vegetables is currently insufficient. Here, we investigated the uptake, translocation and subcellular distribution behaviors of four commonly used pesticides in Chinese cabbage (Brassica rapa var. chinensis) under laboratory hydroponic conditions. Root uptake of pesticides followed the order of fenbuconazole > avermectin > thiamethoxam > spirotetramat. Thiamethoxam was more readily to be translocated from vegetable root to shoot, while spirotetramat, fenbuconazole and avermectin preferentially accumulated in vegetable root. Cell soluble components were the dominant storage compartment for thiamethoxam. The majority of spirotetramat, fenbuconazole and avermectin were partitioned into the cell walls. Hopefully, results of this study would extend the current knowledge of pesticide bioconcentration behavior in food-crops and assist in properly evaluating the threats of pesticide residues to human health via food chain.
在农业活动中广泛应用农药引起了人们对农作物中农药残留污染的日益关注。由于在蔬菜整个生长过程中高浓度地使用农药，蔬菜似乎更容易受到农药污染，而目前有关农药在蔬菜中的迁移和细胞扩散特性的信息还不够充分。在这里，我们在实验室水培条件下研究了四种常用农药在白菜（ Brassica rapa var. chinensis ）中的吸收、迁移和亚细胞分布行为。四种农药在白菜根中的吸收顺序为：苯醚甲环唑>阿维菌素>噻虫嗪>螺虫乙酯。噻虫嗪更容易从蔬菜根部迁移到茎叶，而螺虫乙酯、苯醚甲环唑和阿维菌素则优先在蔬菜根部积累。细胞可溶性成分是噻虫嗪的主要储存部位。大多数螺虫乙酯、苯醚甲环唑和阿维菌素分配到细胞壁中。希望本研究的结果将扩展目前对食物链中食物中农药生物浓缩行为的认识，并有助于正确评估农药残留对人类健康的威胁。
