Toxicological effects and risk assessment of lanthanum ions on leaves of Viciafaba L. seedlings
Viciafaba 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 such as superoxide radical （O2） and hyd...
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| Published in | 中国稀土学报：英文版 Vol. 29; no. 10; pp. 997 - 1003 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
2011
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| Subjects | |
| Online Access | Get full text |
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| Summary: | Viciafaba 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 such as superoxide radical （O2） and hydrogen peroxide （H202） were overproduced at higher concentrations of La, resulting in oxidatively modi- fied proteins and shoot growth retardation. While, superoxide dismutase （SOD）, catalase （CAT）, ascorbate peroxidase （APX） and guaiacol peroxidase （GPX） isoenzymes were elevated to some extent to eliminate excess of ROS. HSP70 production and endopeptidase isoenzymes were also enhanced, which were involved in repairing or degradation of the oxidatively modified proteins due to La. Thus, the antioxidant isoenzymes, endoprotease isoenzymes and HSP70 worked cooperatively to alleviate the La-induced oxidative damage. The significant en- hancement of CAT and APX isoenzymes and HSP70 could also be used as early bioindicators of La-polluted solution. The threshold dose range 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 be helpful to further understand the toxicological effects and possible mechanisms of REE（s） on crop seedlings. |
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| Bibliography: | 11-2788/TF WANG Ning, WANG Chengrun , BAO Xia , LI Yueyun, TIAN Liumin ZOU Huixian, WANG Xiaorong （（1. State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China, 2. School of Resources and Environmental Engineering, Anhui University, Hefei 230061, China, 3. School of Life Science, Huainan Normal University, Huainan 232001, China, 4. Department of Chemistry and Chemical Engineering, Huainan Normal University, Huainan 232001, China） rare earth elements （REEs）; reactive oxygen species （ROS）; antioxidant isoenzymes; HSP70; biomarker; ecological risk assessment Viciafaba 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 such as superoxide radical （O2） and hydrogen peroxide （H202） were overproduced at higher concentrations of La, resulting in oxidatively modi- fied proteins and shoot growth retardation. While, superoxide dismutase （SOD）, catalase （CAT）, ascorbate peroxidase （APX） and guaiacol peroxidase （GPX） isoenzymes were elevated to some extent to eliminate excess of ROS. HSP70 production and endopeptidase isoenzymes were also enhanced, which were involved in repairing or degradation of the oxidatively modified proteins due to La. Thus, the antioxidant isoenzymes, endoprotease isoenzymes and HSP70 worked cooperatively to alleviate the La-induced oxidative damage. The significant en- hancement of CAT and APX isoenzymes and HSP70 could also be used as early bioindicators of La-polluted solution. The threshold dose range 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 be helpful to further understand the toxicological effects and possible mechanisms of REE（s） on crop seedlings. |
| ISSN: | 1002-0721 2509-4963 |