Abstract：
Seed coating with pesticides is used extensively for the protection of both seeds and plants against pests. In this study, the uptake and transport of seed-coating pesticides (insecticides), including cyantraniliprole (CYN) and thiamethoxam (THX), were investigated. The translocation of these pesticides from the soil to the plant and their accumulation in different plant parts were also calculated. After sowing the seeds with seed coating pesticides, soil and plant samples were taken across the study area. These samples were extracted and analyzed in liquid chromatography with tandem mass spectrometry (LC-MS/MS). CYN and THX were used in maize plants for the first time to observe soil degradation kinetics, and CYN showed a higher half-life than THX in soil. Both pesticides have been taken up by the corn maize plant and transferred and accumulated to the upper parts of the plant. Although the THX concentration was between 2.240 and 0.003 mg/kg in the root, between 3.360 and 0.085 mg/kg in the stem, it was between 0.277 and 3.980 mg/kg in the leaf, whereas CYN was detected at higher concentrations. The concentration of CYN was 1.472 mg/ kg and 0.079 mg/kg in the roots and stems of the maize plant, respectively. However, the bioconcentration factor (BCF) indicates the soil-to-plant accumulation of CYN from 28 to 34.6 and that of 12.5 to 4567.1 for THX on different sampling days. The translocation factor (TFstem) represents the ratio of pesticides absorbed from the stem and transported to the roots. For CYN, TFstem ranges from 3.6 to 20.5, while for THX, it varies between 1.5 and 26.8, indicating a higher translocation rate for THX. The ratio of leaf to root concentration are 3.6 to 20.5 for CYN and 1.8 to 87.7 for THX, demonstrating effective translocation for both pesticides. The TF values for both pesticides are above 1, signifying successful root-to-stem-to-leaf movement. Notably, THX exhibits a notably higher transport rate compared to CYN.
摘要：
具有杀虫剂的种子包衣广泛用于保护种子和植物免受害虫侵害。在这项研究中,种子包衣农药（杀虫剂）的吸收和运输，包括氰尿嘧啶（CYN）和噻虫嗪（THX），被调查了。还计算了这些农药从土壤到植物的转运及其在不同植物部位的积累。用种子包衣农药播种后，在整个研究区域采集了土壤和植物样本。提取这些样品并在具有串联质谱的液相色谱(LC-MS/MS)中分析。CYN和THX首次用于玉米植株的土壤退化动力学观察,CYN在土壤中的半衰期高于THX。两种农药都已被玉米玉米植物吸收，并转移并积累到植物的上部。尽管根中THX的浓度在2.240和0.003mg/kg之间，茎中3.360至0.085mg/kg，它在叶片中介于0.277和3.980毫克/千克之间，而CYN在较高浓度时检测到。玉米植株根和茎中CYN的浓度分别为1.472mg/kg和0.079mg/kg,分别。然而,生物富集因子（BCF）表示不同采样日的THX的CYN从28到34.6的土壤到植物的积累，从12.5到4567.1的积累。易位因子(TFstem)表示从茎吸收并运输到根的农药的比率。对于CYN,TFstem的范围从3.6到20.5，而对于THX，它在1.5和26.8之间变化,表明THX的易位率较高.CYN的叶与根浓度之比为3.6至20.5，THX为1.8至87.7，证明了两种农药的有效转运。两种农药的TF值都大于1,表示成功的根-茎-叶运动。值得注意的是,与CYN相比,THX表现出明显更高的转运速率。
