Department of Applied Chemistry, College of Science, Nanjing 210095, China.
J Agric Food Chem. 2010 Mar 10;58(5):3232-40. doi: 10.1021/jf9027766.
Napropamide is a herbicide widely used for controlling annual weeds. Substantial use of napropamide in recent years has led to its bioaccumulation in ecosystems and thus contamination to crops. Meanwhile, application of dissolved organic matters (DOMs) to soils in the form of compost, sludge, or plant residues has become a popular practice in agriculture management owning to its low cost and recycling of nutrients. However, whether DOMs affect environmental behaviors of herbicides in soil-plant systems is poorly understood. This study investigated napropamide accumulation and biological responses as affected by DOMs in Brassica napus . Plants exposed to 0-16 mg/kg napropamide show inhibited growth and oxidative damage. Treatment with 50 mg of DOC/kg DOMs derived from either sludge or straw improved plant growth and reduced napropamide accumulation in plants. Both DOMs reduced the production of reactive oxygen species (ROS) and the activities of antioxidative enzymes in napropamide-exposed plants. Analysis of FT-IR spectra confirmed the difference between structures of the two DOMs. Additional evidence was provided by three-dimensional excitation-emission matrix (EEM) fluorescence spectra to demonstrate the DOM-napropamide complex formed during the process of the interaction.
萘丙胺是一种广泛用于控制一年生杂草的除草剂。近年来大量使用萘丙胺导致其在生态系统中生物积累，从而污染作物。同时，以堆肥、污泥或植物残渣的形式将溶解有机质 (DOMs) 施用于土壤在农业管理中因其低成本和养分回收而成为一种流行做法。然而，DOMs 是否会影响土壤-植物系统中除草剂的环境行为尚不清楚。本研究调查了 DOMs 对油菜中萘丙胺积累和生物响应的影响。暴露于 0-16mg/kg 萘丙胺的植物表现出生长抑制和氧化损伤。用 50mgDOC/kg 来自污泥或秸秆的 DOM 处理可改善植物生长并减少植物中萘丙胺的积累。两种 DOMs 均降低了暴露于萘丙胺的植物中活性氧 (ROS) 的产生和抗氧化酶的活性。傅里叶变换红外 (FT-IR) 光谱分析证实了两种 DOM 结构之间的差异。三维激发-发射矩阵 (EEM) 荧光光谱提供了额外的证据，证明了在相互作用过程中形成的 DOM-萘丙胺络合物。
