State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
J Agric Food Chem. 2024 Nov 6;72(44):24246-24259. doi: 10.1021/acs.jafc.4c05342. Epub 2024 Oct 23.
Decabromodiphenyl ethane (DBDPE) and cadmium (Cd) are typical pollutants in e-waste, seriously threatening crop growth. This study investigated the bioaccumulation and toxicity mechanisms of DBDPE and Cd in a soil-rice system. The results showed that 50 mg/kg DBDPE could reduce the level of accumulation of Cd in rice roots. DBDPE and Cd induced the antioxidant system (SOD, POD, and MDA) in rice seedlings. The combined exposure reduced the contents of carbohydrates, lipids, amino acids, and organic acids. Phenylalanine and phenylpropanoid metabolisms were identified as the key detoxification metabolic pathways under combined exposure. DBDPE and Cd disrupted the functional cycling of carbon and nitrogen in rhizosphere soil, while Gemmatimonadetes, Actinobacteria, and Bacteroidetes were the key bacterial groups responding to DBDPE and Cd stress. This work provides data for the toxicity risk evaluation of DBDPE and Cd combined exposure to food crops.
十溴二苯乙烷（DBDPE）和镉（Cd）是电子废物中的典型污染物，严重威胁着作物的生长。本研究调查了 DBDPE 和 Cd 在土壤-水稻系统中的生物积累和毒性机制。结果表明，50mg/kg 的 DBDPE 可降低水稻根部 Cd 的积累水平。DBDPE 和 Cd 诱导了水稻幼苗的抗氧化系统（SOD、POD 和 MDA）。联合暴露降低了碳水化合物、脂质、氨基酸和有机酸的含量。鉴定出苯丙氨酸和苯丙烷代谢途径是联合暴露下的关键解毒代谢途径。DBDPE 和 Cd 破坏了根际土壤中碳氮的功能循环，而芽单胞菌门、放线菌门和拟杆菌门是对 DBDPE 和 Cd 胁迫做出响应的关键细菌类群。这项工作为 DBDPE 和 Cd 联合暴露对粮食作物的毒性风险评估提供了数据。
