Toxicological effects and risk assessment of lanthanum ions on leaves of Vicia faba L.seedlings
来源期刊：Journal of Rare Earths2011年第10期
论文作者：王宁 汪承润 鲍霞 李月云 田刘敏 邹惠仙 王晓蓉
文章页码：997 - 1003
摘 要：Vicia faba L.seedlings were hydroponically cultivated in 0-12 mg/L of extraneous lanthanum（La） for 15 d to investigate ecotoxicological effects and risk assessment of rare earth elements（REEs）.The results showed that reactive oxygen species（ROS） production suchas superoxide radical（O2.-） and hydrogen peroxide（H2O2） were overproduced at higher concentrations of La,resulting in oxidatively modified proteins and shoot growth retardation.While,superoxide dismutase（SOD）,catalase（CAT）,ascorbate peroxidase（APX） and guaiacolperoxidase（GPX） isoenzymes were elevated to some extent to eliminate excess of ROS.HSP70 production and endopeptidase isoenzymeswere also enhanced,which were involved in repairing or degradation of the oxidatively modified proteins due to La.Thus,the antioxidantisoenzymes,endoprotease isoenzymes and HSP70 worked cooperatively to alleviate the La-induced oxidative damage.The significant enhancement of CAT and APX isoenzymes and HSP70 could also be used as early bioindicators of La-polluted solution.The threshold doserange was firstly delimited as 1-2 mg/L of extraneous La,corresponding to 7.34-9.37 μg/g dry weight in the leaves.These results would behelpful to further understand the toxicological effects and possible mechanisms of REE（s） on crop seedlings.
王宁1,2，汪承润3，鲍霞4，李月云3，田刘敏3，邹惠仙1，王晓蓉1
1. State Key Laboratory of Pollution Control and Resources Reuse,School of the Environment,Nanjing University2. School of Resources and Environmental Engineering,Anhui University3. School of Life Science,Huainan Normal University4. Department of Chemistry and Chemical Engineering,Huainan Normal University
摘 要：Vicia faba L.seedlings were hydroponically cultivated in 0-12 mg/L of extraneous lanthanum（La） for 15 d to investigate ecotoxicological effects and risk assessment of rare earth elements（REEs）.The results showed that reactive oxygen species（ROS） production suchas superoxide radical（O2.-） and hydrogen peroxide（H2O2） were overproduced at higher concentrations of La,resulting in oxidatively modified proteins and shoot growth retardation.While,superoxide dismutase（SOD）,catalase（CAT）,ascorbate peroxidase（APX） and guaiacolperoxidase（GPX） isoenzymes were elevated to some extent to eliminate excess of ROS.HSP70 production and endopeptidase isoenzymeswere also enhanced,which were involved in repairing or degradation of the oxidatively modified proteins due to La.Thus,the antioxidantisoenzymes,endoprotease isoenzymes and HSP70 worked cooperatively to alleviate the La-induced oxidative damage.The significant enhancement of CAT and APX isoenzymes and HSP70 could also be used as early bioindicators of La-polluted solution.The threshold doserange was firstly delimited as 1-2 mg/L of extraneous La,corresponding to 7.34-9.37 μg/g dry weight in the leaves.These results would behelpful to further understand the toxicological effects and possible mechanisms of REE（s） on crop seedlings.
关键词：
