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Enhanced efficiency of cadmium removal by Boehmeria nivea (L.) Gaud. in the presence of exogenous citric and oxalic acids
作者姓名:Huaying Li  Yunguo Liu  Guangming Zeng  Lu Zhou  Xin Wang  Yaqin Wang  Chunlin Wang  Xinjiang Hu  Weihua Xu
作者单位:College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
基金项目:This work was supported by the National Natural Science Foundation of China (No. 41271332), the Natural Science Foundation of Hunan province (No. 11JJ2031) and the Science and Technology Planning Project of Hunan Province, China (No. 2012SK2021).
摘    要:Boehmeria nivea(L.) Gaud. is a potential candidate for the remediation of Cd contaminated sites. The present investigation aims to explore Cd tolerance threshold and to quickly identify the role of exogenous organic acids in Cd uptake and abiotic metal stress damage.Elevated Cd levels(0–10 mg/L) resulted in an obvious rise in Cd accumulation, ranging from268.0 to 374.4 in root and 25.2 to 41.2 mg/kg dry weight in shoot, respectively. Citric acid at1.5 mmol/L significantly facilitated Cd uptake by 26.7% in root and by 1-fold in shoot,respectively. Cd translocation efficiency from root to shoot was improved by a maximum of66.4% under 3 mmol/L of oxalic acid. Citric acid exhibited more prominent mitigating effect than oxalic acid due to its stronger ligand affinity for chelating with metal and avoiding the toxicity injury of free Cd ions more efficiently. The present work provides a potential strategy for efficient Cd remediation with B. nivea.

关 键 词:镉吸收  柠檬酸  工作效率  草酸  生物金属  污染场地  应激损伤  快速识别
收稿时间:1/6/2014 12:00:00 AM
修稿时间:14 April 2014

Enhanced efficiency of cadmium removal by Boehmeria nivea (L.) Gaud. in the presence of exogenous citric and oxalic acids
Huaying Li,Yunguo Liu,Guangming Zeng,Lu Zhou,Xin Wang,Yaqin Wang,Chunlin Wang,Xinjiang Hu,Weihua Xu.Enhanced efficiency of cadmium removal by Boehmeria nivea (L.) Gaud. in the presence of exogenous citric and oxalic acids[J].Journal of Environmental Sciences,2014,26(12):2508-2516.
Authors:Huaying Li  Yunguo Liu  Guangming Zeng  Lu Zhou  Xin Wang  Yaqin Wang  Chunlin Wang  Xinjiang Hu and Weihua Xu
Institution:College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Resources and Environmental Science, Hunan Normal University, Changsha 410081, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
Abstract:Boehmeria nivea (L.) Gaud. is a potential candidate for the remediation of Cd contaminated sites. The present investigation aims to explore Cd tolerance threshold and to quickly identify the role of exogenous organic acids in Cd uptake and abiotic metal stress damage. Elevated Cd levels (0-10 mg/L) resulted in an obvious rise in Cd accumulation, ranging from 268.0 to 374.4 in root and 25.2 to 41.2 mg/kg dry weight in shoot, respectively. Citric acid at 1.5 mmol/L significantly facilitated Cd uptake by 26.7% in root and by 1-fold in shoot, respectively. Cd translocation efficiency from root to shoot was improved by a maximum of 66.4% under 3 mmol/L of oxalic acid. Citric acid exhibited more prominent mitigating effect than oxalic acid due to its stronger ligand affinity for chelating with metal and avoiding the toxicity injury of free Cd ions more efficiently. The present work provides a potential strategy for efficient Cd remediation with B. nivea.
Keywords:Heavy metal  Phytoremediation  Lipid peroxidation  Antioxidant defense  Translocation factor
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