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| Interactive effects of selenite and arsenite on physiological characteristics and accumulation of arsenic and selenium in rice seedlings |
| Received:August 24, 2017 |
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| KeyWord:rice;selenium;arsenic;antioxidant defense system;thiol compounds;interactive effect |
| Author Name | Affiliation | E-mail | | LIU Jin-chang | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
Research Centre of Trace Elements, Huazhong Agricultural University, Wuhan 430070, China | | | XIONG Shuang-lian | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
Research Centre of Trace Elements, Huazhong Agricultural University, Wuhan 430070, China
Hubei Key Laboratory of Soil Environment and Pollution Remediation, Wuhan 430070, China | xsl@mail.hzau.edu.cn | | MA Shuo | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
Research Centre of Trace Elements, Huazhong Agricultural University, Wuhan 430070, China | | | GAO Fei | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
Research Centre of Trace Elements, Huazhong Agricultural University, Wuhan 430070, China | | | TU Shu-xin | College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
Research Centre of Trace Elements, Huazhong Agricultural University, Wuhan 430070, China
Hubei Key Laboratory of Soil Environment and Pollution Remediation, Wuhan 430070, China | |
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| Abstract: |
| Understanding the interactive effects of selenium and arsenic on rice growth and accumulation of arsenic and selenium in rice is of great significance in developing techniques to reduce arsenic and to increase selenium in rice. A hydroponic experiment was conducted to study the interactive effects of selenite and arsenite on the fresh weight of seedlings, antioxidant defense system, and the arsenic and selenium contents of rice, and the results showed that low levels of arsenite(5 μmol·L-1) and selenite(≤ 5 μmol·L-1) had a synergistic promotion effect on the growth of seedlings. High selenium(10 μmol·L-1) antagonized the growth inhibition by high arsenic level(25 μmol·L-1). Antagonistic effects on the translocation and accumulation of arsenic and selenium in shoots were also found, except for the increase of selenium accumulation at low arsenic levels. High levels of arsenite significantly increased the activities of superoxide dismutase(SOD) and peroxidase(POD) and the contents of glutathione(GSH), non-protein thiols(NPT), and phytochelatins(PCs) in rice seedlings, and the malondialdehyde(MDA) content was 1.71~1.87 times as high as in the control. In addition, combined treatment of arsenite and selenite had a synergistic effect of increasing glutathione peroxidase(GPx) activity in the seedlings. The results showed that under high arsenite conditions, high selenium treatment increased both GPx activity and the contents of NPT and PCs in roots, which alleviated the toxicity induced by high arsenite stress. It is concluded that the optimum concentration of selenium can promote plant growth, reduce arsenic content, and increase selenium content under arsenic stress conditions. |
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