Liu Yuan, Tao Zhen, Lu Hailong, Li Siyi, Hu Chao, Li Zhongyang
Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang, China.
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.
Front Plant Sci. 2023 Mar 27;14:930632. doi: 10.3389/fpls.2023.930632. eCollection 2023.
The adsorption behaviors and transfer pathways of antibiotics in plant-soil system are greatly influenced by the electrochemical properties of both soil particles and plant roots. However, the effects of roots electrochemical properties on antibiotic adsorption are largely unknown. Here, the fresh soybean, maize, and wheat roots with different electrochemical properties were obtained from hydroponic cultivation, and the adsorption processes and mechanisms of doxycycline, tetracycline, sulfadiazine, and norfloxacin on roots under various environmental conditions were investigated. Results showed that the adsorption amount of antibiotics on roots increased with the initial concentration of antibiotics. The coexisting low-molecular weight organic acids and anions inhibited the antibiotic adsorption on roots. The soybean roots performed strong adsorption ability compared with the maize and wheat roots driven by the variations in root electrochemical properties. This study demonstrates the significance of electrochemical interactions between antibiotics and roots in plant-soil system and can contribute to the more accurate risk assessment and effective pollution control of antibiotics.
抗生素在植物 - 土壤系统中的吸附行为和迁移途径受到土壤颗粒和植物根系电化学性质的显著影响。然而，根系电化学性质对抗生素吸附的影响在很大程度上尚不清楚。在此，通过水培获得了具有不同电化学性质的新鲜大豆、玉米和小麦根系，并研究了在各种环境条件下强力霉素、四环素、磺胺嘧啶和诺氟沙星在根系上的吸附过程及机制。结果表明，抗生素在根系上的吸附量随抗生素初始浓度的增加而增加。共存的低分子量有机酸和阴离子抑制了抗生素在根系上的吸附。受根系电化学性质变化的驱动，与玉米和小麦根系相比，大豆根系表现出较强的吸附能力。本研究证明了植物 - 土壤系统中抗生素与根系之间电化学相互作用的重要性，并有助于对抗生素进行更准确的风险评估和有效的污染控制。
