严岩3,
韩建刚4,5,6
1. 南京林业大学土木工程学院, 南京 210037;
2. Ecological Complexity and Modeling Laboratory, Department of Botany and Plant Sciences, University of California, Riverside, CA, 92521, USA;
3. 江苏省环境科学研究院太湖水污染防治研究中心, 南京 210042;
4. 南京林业大学环境与生物学院, 南京 210037;
5. 南京林业大学南方现代林业协同创新中心, 南京 210037;
6. 江苏洪泽湖湿地生态系统国家定位观测研究站, 洪泽 223100
作者简介: 冯岚(1985-),女,博士,副教授,研究方向为工程环境、森林生态,E-mail:fenglan0108@126.com.
基金项目: 国家自然科学基金资助项目（42007151）；国家重点研发计划课题（2017YFC0505803）；江苏省高校自然科学研究面上项目（19KJB610015）；江苏高校哲学社会科学研究项目（2019SJA0108）；南京林业大学大学生实践创新训练计划项目（2019NFUSPITP0473）中图分类号: X171.5
Effect of Root Surface Iron Membrane on Absorption of Ciprofloxacin by Eichhornia crassipes
Feng Lan1,2,Yan Yan3,
Han Jiangang4,5,6
1. College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;
2. Ecological Complexity and Modeling Laboratory, Department of Botany and Plant Sciences, University of California, Riverside, CA, 92521, USA;
3. Taihu Water Pollution Prevention and Control Research Center, Jiangsu Provincial Academy of Environmental Science, Nanjing 210042, China;
4. College of Environment and Biology, Nanjing Forestry University, Nanjing 210037, China;
5. Collaborative Innovation Center of Southern Modern Forestry, Nanjing Forestry University, Nanjing 210037, China;
6. National Positioning Observation and Research Station of Hongze Lake Wetland Ecosystem, Jiangsu Province, Hongze 223100, China
CLC number: X171.5
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摘要:为探讨铁离子不同浓度处理下水生植物根表铁膜形成及其对环丙沙星（ciprofloxacin，CIP）吸收的影响，采用室内模拟试验，分析100 μg·L-1 CIP胁迫下不同浓度铁离子（0、10、20、50、100和150 mg·L-1）对凤眼莲根系生理生化及CIP富集量的影响。结果表明，不同浓度铁离子对凤眼莲根系孔隙度和泌氧量无显著影响，而根系活力随着铁离子浓度增加呈上升趋势；铁离子促进凤眼莲根表铁膜形成，150 mg·L-1铁离子处理下凤眼莲根表铁膜量最大，且根表吸附CIP含量最多，而根系中吸收CIP含量显著降低。铁离子对凤眼莲根系生理生化无显著影响，而有利于凤眼莲根表铁膜量增加，促进根系表面CIP的吸附作用，阻碍根系对CIP的吸收作用，降低CIP对植物造成的伤害。
关键词: 环丙沙星/
凤眼莲/
根表铁膜/
铁离子
Abstract:The formation of iron membrane on the root surface of aquatic plants and its effect on the absorption of ciprofloxacin (CIP) are two critical issues for phytoremediation of antibiotic pollution. To address these two issues, this study presented experimental results under different concentrations of iron ions (0, 10, 20, 50, 100, and 150 mol ·L-1) under the stress of 0.1mg·L-1 CIP. The effects of different concentrations of iron ions on the physiological and biochemical characteristics of roots and the concentration of CIP in roots were studied. Tests showed that: (i) Different concentrations of iron had no significant effect on the porosity and oxygen production of roots, but the root activity increased with the increase of iron concentration. (ii) Iron ions promoted the formation of iron membrane on root surface of lotus. The amount of iron membrane on root surface of Eichhornia crassipes and the absorbed CIP content on root surface both reached the peak at the iron ion concentration of 150 mg·L-1. (iii) The accumulated CIP content in root decreased significantly with the increase of iron ions. (iv) Iron ion had no significant effect on the physiological and biochemical characteristics of the root, whereas it was beneficial to increase the amount of iron membrane on the root surface, promote the adsorption of CIP on the root surface, hinder the uptake of CIP in root, and reduce the damage caused by CIP to the plant.
Key words:ciprofloxacin/
Eichhornia crassipes/
iron membrane/
iron ions.
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