School of Environment, Nanjing Normal University, 1, Wenyuan Road, Xianlin University District, Nanjing, 210023, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Oct;26(29):30348-30355. doi: 10.1007/s11356-019-06232-5. Epub 2019 Aug 21.
Antibiotic residues pose a threat to the health of aquatic organisms. The effects and accumulation of antibiotic ciprofloxacin (CIP) in a floating macrophyte (Eichhornia crassipes) under hydroponic conditions were investigated. It was found that E. crassipes exposure to CIP (< 1000 μg L) could maintain a stable photosynthesis efficiency. In response to CIP stress, catalase and peroxidase activities of leaves were 7.24-37.51 nmol min g and 98.46-173.16 U g, respectively. The presence of CIP did not inhibit the growth of the plant. After 14 days of exposure, tender leaves became white and withered, ascribed to the decline of chlorophyll content and chlorophyll fluorescence parameters. The CIP concentrations, absorbed by E. crassipes, were highest in the roots, followed by white aerial parts and green aerial parts at CIP concentrations of 100 and 1000 μg L. These findings demonstrated that E. crassipes could absorb and tolerate CIP in a limited time-scale and imply an alternative solution for phytoremediation in water bodies contaminated with antibiotics.
抗生素残留对水生生物的健康构成威胁。本研究在水培条件下调查了抗生素环丙沙星（CIP）在漂浮植物（凤眼莲）中的作用和积累。结果表明，凤眼莲暴露于 CIP（<1000μg/L）下可保持稳定的光合作用效率。在 CIP 胁迫下，叶片的过氧化氢酶和过氧化物酶活性分别为 7.24-37.51 nmol min g 和 98.46-173.16 U g。CIP 的存在并没有抑制植物的生长。暴露 14 天后，嫩叶片变白枯萎，这归因于叶绿素含量和叶绿素荧光参数的下降。在 100 和 1000μg/L 的 CIP 浓度下，凤眼莲吸收的 CIP 浓度以根部最高，其次是白色地上部分和绿色地上部分。这些发现表明，凤眼莲可以在有限的时间尺度内吸收和耐受 CIP，这为受抗生素污染的水体提供了一种植物修复的替代方案。
