Wang Yujie, Wang Aoyu, Jiang Longfei, Hu Beibei, Luo Chunling
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China.
State Key Laboratory of Advanced Environmental Technology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China; Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou, 510640, China; Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, China.
Environ Pollut. 2025 Oct 1;382:126681. doi: 10.1016/j.envpol.2025.126681. Epub 2025 Jun 16.
Recent studies have highlighted the potential risks of organophosphate esters (OPEs) accumulating in the food chain; however, the key factors governing their uptake and translocation in plants remain unclear. In this study, we investigated the primary drivers influencing the fate of OPEs in corn (Zea mays L.). Our results show that log Kow, DOC content, and Cu concentration play critical roles in regulating OPEs uptake. Specifically, log Kow were negatively correlated with both the shoot concentration factor (SCF, R > 0.70) and translocation factor (TF, R > 0.42), indicating that less hydrophobic OPEs are more readily translocated to plant tissues. Corn grown in magalitic soil accumulated OPEs at levels averaging 24% higher than those grown in krasnozem, corresponding to 2.2 times greater DOC content in magalitic soil. Cu addition (1600 mg/kg) led to a 181% and 47% increase in OPEs accumulation in roots grown in krasnozem and magalitic soils, respectively, likely due to Cu-induced disruption of root cell membrane permselectivity. Plants in krasnozem soil experienced more severe Cu-induced toxicity, attributed to its lower pH (4.47), resulting in greater OPEs accumulation than in magalitic soil. Moreover, enhanced correlations between SCF (R > 0.70), TF (R > 0.58), and log Kow following Cu exposure suggest that Cu may inhibit active transport while promoting passive diffusion. These findings offer a comprehensive understanding of OPEs behavior in the plant-soil system and provide important insights for evaluating the environmental risk of OPEs contamination in crops.
近期研究强调了有机磷酸酯（OPEs）在食物链中积累的潜在风险；然而，控制其在植物中吸收和转运的关键因素仍不清楚。在本研究中，我们调查了影响玉米（Zea mays L.）中OPEs归宿的主要驱动因素。我们的结果表明，辛醇-水分配系数对数（log Kow）、溶解性有机碳（DOC）含量和铜浓度在调节OPEs吸收方面起着关键作用。具体而言，log Kow与地上部富集系数（SCF，R > 0.70）和转运系数（TF，R > 0.42）均呈负相关，表明疏水性较低的OPEs更容易转运到植物组织中。在马加立土中生长的玉米积累的OPEs水平平均比在红壤中生长的玉米高24%，这与马加立土中DOC含量高2.2倍相对应。添加铜（1600 mg/kg）分别导致红壤和马加立土中生长的根系中OPEs积累增加181%和47%，这可能是由于铜诱导根细胞膜选择透过性受到破坏。红壤中的植物经历了更严重的铜诱导毒性，这归因于其较低的pH值（4.47），导致OPEs积累比马加立土中更多。此外，铜暴露后SCF（R > 0.70）、TF（R > 0.58）与log Kow之间的相关性增强，表明铜可能抑制主动运输，同时促进被动扩散。这些发现为全面了解OPEs在植物-土壤系统中的行为提供了依据，并为评估作物中OPEs污染的环境风险提供了重要见解。
