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| Ecotoxicity of Sb (Ⅲ) and Sb (Ⅴ) on rice by relative root elongation experiments |
| Received:December 12, 2017 |
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| KeyWord:antimony;rice;absorptive;enzymes;toxicity |
| Author Name | Affiliation | E-mail | | ZHU Ting-ting | School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu-jun | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yjwang@issas.as.cn | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | SHI Wei-lin | School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China | weilin-shi@163.com | | DANG Fei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| This study was conducted to investigate the ecotoxicity of Sb (Ⅲ) and Sb (Ⅴ) on rice by relative root elongation experiments using a hydroponic culture system containing solution. In the present study, the toxicity of antimonite and antimonate on the selected 44 varieties of rice was studied by their relative root elongations, and two varieties of rice sensitive and tolerant to antimonite and antimonate were selected to explore the mechanism of Sb toxicity. The results showed that the toxicity of Sb (Ⅲ) to rice root elongation was significantly greater than that of Sb (Ⅴ). In the 44 kinds of rice, the value of EC50, Sb (Ⅲ) was in the range of 0.82 to 100.24 mg·L-1, while, the value of EC50, Sb (Ⅴ) was in the range of 13.34 to 766.78 mg·L-1. Yangjing 687 was more sensitive to Sb (Ⅲ) with an EC50 of 0.82 mg·L-1, and Xuhan 1 was more obtuse to Sb (Ⅲ) and the EC50 value was 100.27 mg·L-1, the difference between the tolerant and sensitive rice being 122 folds. Shenliangyou 5183 was more sensitive to Sb (Ⅴ) and the EC50 value was 13.34 mg·L-1, and Zixiangmi was more obtuse to Sb (Ⅴ) and the EC50 value was 776.78 mg·L-1, the difference between the tolerant and sensitive rice being 58 folds. The SOD and MDA contents of the 4 kinds of rice were measured, and it was found that the SOD enzyme activity and MDA contents were higher in the roots of rice plants exposed to Sb, which indicated that the roots were poisoned by Sb, and the mechanism of toxicity might be oxidative stress. The results suggested that the rice plant might be subdued by Sb (Ⅲ) and Sb (Ⅴ), and that the inhibitory effect of Sb (Ⅲ) was greater than that of Sb (Ⅴ). |
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