The National Field Station of Lake Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, China.
The National Field Station of Lake Ecosystem of Liangzi Lake, College of Life Science, Wuhan University, Wuhan 430072, China.
Sci Total Environ. 2019 Mar 10;655:1448-1456. doi: 10.1016/j.scitotenv.2018.11.213. Epub 2018 Nov 15.
The coexistence of glyphosate and copper is widely found in bodies of water and terrestrial ecosystems due to widespread application of herbicides and heavy metal. However, their joint ecotoxicological risks in aquatic environments remain unknown. The experiment investigated the individual and combined effects of glyphosate and copper on the growth and physiological response in Salvinia natans (L.) All. The results showed that their joint toxicity is related to concentration. Antagonistic effects were induced when plants were exposed to low concentrations of glyphosate and copper (≤1 + 0.2 mg l). Synergistic effects were elicited at higher doses (≥5 + 1 mg l). In addition, increased hydrogen peroxide levels indicated the occurrence of oxidative stress at individual or combined exposures. To cope with oxidative stress, S. natans can activate the antioxidant defense systems, including increased superoxide dismutase and changes in peroxidase, ascorbate peroxidase and catalase. High concentrations of combined pollution exceed the oxidative defense capabilities of plants, and therefore, malondialdehyde content increased significantly. Our results indicated that the ecotoxicity of glyphosate or copper may be exacerbated in aquatic environments and caused obvious damage to S. natans.
草甘膦和铜广泛存在于水体和陆地生态系统中，这是由于除草剂和重金属的广泛应用。然而，它们在水生环境中的联合生态毒理学风险尚不清楚。本实验研究了草甘膦和铜单独及联合作用对水鳖（Salvinia natans (L.) All.）生长和生理响应的影响。结果表明，它们的联合毒性与浓度有关。当植物暴露于低浓度的草甘膦和铜（≤1+0.2mg·l）时，会产生拮抗作用。在更高剂量（≥5+1mg·l）下会产生协同作用。此外，过氧化氢水平的增加表明在单独或联合暴露下发生了氧化应激。为了应对氧化应激，水鳖可以激活抗氧化防御系统，包括增加超氧化物歧化酶和过氧化物酶、抗坏血酸过氧化物酶和过氧化氢酶的变化。高浓度的联合污染超过了植物的氧化防御能力，因此丙二醛含量显著增加。我们的结果表明，草甘膦或铜的生态毒性在水生环境中可能会加剧，并对水鳖造成明显的损害。
