Shanghai Shifang Ecology and Landscape Co., Ltd, Shanghai 200233, PR China; Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
Chemosphere. 2022 Dec;308(Pt 1):136098. doi: 10.1016/j.chemosphere.2022.136098. Epub 2022 Aug 19.
Oxytetracycline and sulfadiazine were widely used and they entered the environment through various channels such as domestic sewage, medical wastewater and agricultural wastewater, causing significant ecological risk. To determine the effects of different antibiotic concentrations on submerged macrophytes, Vallisneria natans was exposed to solutions containing different concentrations of oxytetracycline and sulfadiazine (0.1 mg/L、1 mg/L、10 mg/L、50 mg/L). After 20-days exposure, we found that 10 mg/L groups had a significant effect on Vallisneria natans. Under high antibiotic concentrations, the growth of Vallisneria natans was inhibited, chloroplasts were deformed, the chlorophyll content was reduced, and antioxidant enzyme activities, such as superoxide dismutase and glutathione, were increased. There was no significant difference between the control group and groups with low antibiotic concentrations (≤1 mg/L). The N-acyl-l-homoserine lactone concentration tended to increase with increasing antibiotic concentrations. The presence of antibiotics also affected the microbial community structure of biofilms on the submerged macrophytes. For example, the higher the concentration of antibiotics, the higher the proportion of Proteobacteria. These results suggest that high concentrations of oxytetracycline and sulfadiazine can disrupt homeostasis, induce effective Vallisneria natans defense mechanisms and alter biofilms in aquatic ecosystems.
土霉素和磺胺嘧啶被广泛应用，它们通过生活污水、医疗废水和农业废水等多种途径进入环境，造成了显著的生态风险。为了确定不同抗生素浓度对沉水植物的影响，将苦草暴露于含有不同浓度土霉素和磺胺嘧啶的溶液中（0.1mg/L、1mg/L、10mg/L、50mg/L）。经过 20 天的暴露，我们发现 10mg/L 组对苦草有显著影响。在高抗生素浓度下，苦草的生长受到抑制，叶绿体变形，叶绿素含量降低，超氧化物歧化酶和谷胱甘肽等抗氧化酶活性增加。在低抗生素浓度（≤1mg/L）组与对照组之间没有显著差异。N-酰基高丝氨酸内酯的浓度随着抗生素浓度的增加而增加。抗生素的存在也影响了沉水植物生物膜上的微生物群落结构。例如，抗生素浓度越高，变形菌门的比例越高。这些结果表明，高浓度的土霉素和磺胺嘧啶会破坏苦草的内稳态，诱导有效的苦草防御机制，并改变水生生态系统中的生物膜。
