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- Title
硒砷交互作用对水稻幼苗生理特性及砷硒累积的影响.
- Authors
刘锦嫦; 熊双莲; 马烁; 高菲; 涂书新
- 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.
- Subjects
SELENIUM compounds; RICE -- Nutrition; HYDROPONICS; GLUTATHIONE derivatives; MALONDIALDEHYDE; EQUIPMENT &; supplies; THERAPEUTICS
- Publication
Journal of Agro-Environment Science, 2018, Vol 37, Issue 3, p423
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2017-1157