【摘要】 左氧氟沙星（LVFX）作为典型的抗生素在水环境中被广泛检出。目前，LVFX在人工湿地植物中的迁移转化规律研究较少，人们对LVFX如何胁迫植物的认知仍不充分。基于此，该研究设计分根试验，解析了黄花鸢尾对LVFX的降解和响应机制。研究结果表明：黄花鸢尾对LVFX降解促进作用显著，LVFX在植物根系及茎叶组织中呈现“脉冲式”变化趋势，根系附近LVFX的吸收和释放同时存在，植物吸收LVFX后对其向上传输动力大于向下传输动力。当黄花鸢尾根系接触到LVFX后，植物组织内保护酶活性迅速提高，根系活力增强，抑制LVFX的胁迫作用。该文对深入认识LVFX对植物的胁迫机理，加强人工湿地对LVFX等新污染物控制效能具有促进作用。更多还原

【Abstract】 Levofloxacin(LVFX) is widely detected as a typical antibiotic in the aquatic environment. Currently, there are fewer studies on the transport patterns of LVFX in plants from constructed wetlands, and the knowledge of how LVFX stresses plants is still insufficient. Therefore, this study designed a split-root experiment to analyze the degradation and response mechanism of Iris pseudacorus L. to LVFX. The results showed that Iris pseudacorus L. promoted the LVFX degradation, and the concentration of LVFX showed a“pulsed”trend in the root, stem and leaf tissues. The upward transmission was greater than the downward transmission for LVFX in plant tissues. The activity of protective enzymes increased rapidly and root vigor was enhanced to defeat the stress when the roots were exposed to LVFX. This paper contributed to a deeper understanding of the stress mechanism of LVFX on plants and enhanced the efficiency of constructed wetlands in controlling new pollutants such as LVFX.更多还原