Guangdong Provincial Engineering Technology Research Center for Life and Health of River & Lake, Key Laboratory of Water Security Guarantee in Guangdong-Hong Kong-Marco Greater Bay Area of Ministry of Water Resources, Key Laboratory of the Pearl River Estuary Regulation and Protection of Ministry of Water Resources, Pearl River Water Resource Research Institute, Guangzhou 510611, China.
Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Scientific Observing and Experimental Station of South China Sea Fishery Resource and Environment, Ministry of Agriculture and Rural Affairs, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China.
Sci Total Environ. 2023 Jul 10;881:163464. doi: 10.1016/j.scitotenv.2023.163464. Epub 2023 Apr 14.
Phytoremediation is considered an effective technology for remediating antibiotic-contaminated water; however, its underlying mechanisms remain poorly understood. Therefore, this study investigated the phytoremediation potential of fluoroquinolone antibiotics (FQs) by different wetland plant species. The phytoremediation rates of ΣFQs were 46-69 %, and rhizosphere microorganism degradation (accounting for 90-93 %) dominated the FQ removal over that of plant uptake and hydrolysis. Dissipation of the FQs in the hydroponic system followed a first-order kinetic model. The joint action of the more powerful absorptive capacity of plants and stronger microbial degradation ability in the rhizosphere was the reason that Cyperus papyrus showed significantly higher FQ phytoremediation rates than the other three plant species, which implied that the plant species is a critical factor affecting phytoremediation efficiency. The FQ distribution in plant tissues decreased from root > stem > leaf, suggesting that FQs were more concentrated in the roots than in the aboveground tissues. Negative correlations between the diffusive gradient in thin films and root concentrations implied that these wetland plant species took up FQs mainly via active transport mechanism (requiring some vectors, perhaps via exudates); whereas, the process of root-to-stem transfer and upward transport represented passive transport, which mainly depended on transpiration. These results facilitate an improved understanding of phytoremediation processes and improve their future applications.
植物修复被认为是修复抗生素污染水的有效技术；然而，其潜在机制仍知之甚少。因此，本研究调查了不同湿地植物物种对氟喹诺酮类抗生素（FQs）的植物修复潜力。ΣFQs 的植物修复率为 46-69%，根际微生物降解（占 90-93%）主导了 FQ 的去除，而不是植物吸收和水解。在水培系统中，FQs 的消散遵循一级动力学模型。植物更强的吸收能力和根际更强的微生物降解能力的联合作用是香蒲表现出明显更高的 FQ 植物修复率的原因，这表明植物物种是影响植物修复效率的关键因素。FQ 在植物组织中的分布从根>茎>叶减少，表明 FQs 在根部比地上组织中更集中。薄膜扩散梯度与根部浓度之间的负相关关系表明，这些湿地植物物种主要通过主动运输机制（需要一些载体，也许通过分泌物）吸收 FQs；而根到茎的转移和向上运输代表被动运输，主要依赖于蒸腾作用。这些结果有助于更好地理解植物修复过程，并提高它们的未来应用。
