Subcellular distribution governing accumulation and translocation of pesticides in wheat (Triticum aestivum L.)
Subcellular distribution governing accumulation and translocation of pesticides in wheat (Triticum aestivum L.)
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控制小麦（Triticum aestivum L.）农药积累和转运的亚细胞分布
DOI：
10.1016/j.chemosphere.2020.126024
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发表时间：
2020-06-01
期刊：
影响因子：
8.8
通讯作者：
Yu, Yunlong
中科院分区：
文献类型：
--
作者：
Ju, Chao;Dong, Suxia;Yu, Yunlong
研究了K-ow范围为-0.549至4.7的6种农药（呋虫胺、噻虫嗪、吡虫啉、咪草烟、丙环唑和毒死蜱）在小麦中的吸收、转运和亚细胞分布，以研究农药的运输和积累。农药的根系生物富集系数（RCF）随水溶性的增加而减小（R-2 = 0.6121），随疏水性的增加而增大（当pH调节的log K-ow > 2时，R-2 = 0.925）。中性农药从根向地上部的转运量与水溶性成正相关（R-2 > 0.6484），与疏水性成负相关（R-2 > 0.8039）。亚细胞级分浓缩因子（SFCF）与供试农药的疏水性呈线性关系（R-2 > 0.958）。根细胞壁和细胞器中的log RCF与log SFCF呈正相关（R-2 = 0.9894和R-2 = 0.9786）。根和茎细胞壁和细胞器的对数SFCF分别对农药从根向茎和茎向叶的运输产生不利影响（R-2 > 0.7997）和（R-2 > 0.6666）。疏水性依赖的SFCF是一个因素，控制农药在吸收后在根部的积累和随后的向上转运。(C)2020爱思唯尔有限公司保留所有权利。
Root uptake, translocation, and subcellular distribution of six pesticides (dinotefuran, thiamethoxam, imidacloprid, imazethapyr, propiconazole, and chlorpyrifos) with K-ow ranging from -0.549 to 4.7 were investigated in wheat to study transportation and accumulation of pesticides. The root bioconcentration factor (RCF) of pesticides decreased with water solubility (R-2 = 0.6121) and increased with hydrophobicity (when the pH-adjusted log K-ow > 2, R-2 = 0.925), respectively. The translocation of neutral pesticides from roots to shoots increased positively with water solubility (R-2 > 0.6484) but decreased with hydrophobicity (R-2 > 0.8039). The subcellular fraction concentration factor (SFCF) increased linearly with hydrophobicity of the tested pesticides (R-2 > 0.958). The log RCF was positively correlated with log SFCF in root cell walls (R-2 = 0.9894) and organelles (R-2 = 0.9786). Transportation of the pesticides from roots to stems and stems to leaves was adversely affected by the log SFCF of cell walls and organelles of roots (R-2 > 0.7997) and stems (R-2 > 0.6666), respectively. Hydrophobicity-dependent SFCF is a factor governing accumulation of pesticides in roots after uptake and their subsequent upward translocation. (C) 2020 Elsevier Ltd. All rights reserved.