Effect of silicate supplementation on the alleviation of arsenite toxicity in 93-11 (Oryza sativa L. indica)

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• 作者：Haichao Hu (1)
  Junting Zhang (1)
  Hong Wang (1)
  Ruochen Li (1)
  Fengshan Pan (2)
  Jian Wu (3)
  Ying Feng (2)
  Yeqing Ying (4)
  Qingpo Liu (1)
  
• 关键词：Arsenite ; Silicate ; Rice ; Antioxidant enzymes
• 刊名：Environmental Science and Pollution Research
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：20
• 期：12
• 页码：8579-8589
• 全文大小：
• 作者单位：Haichao Hu (1)
  Junting Zhang (1)
  Hong Wang (1)
  Ruochen Li (1)
  Fengshan Pan (2)
  Jian Wu (3)
  Ying Feng (2)
  Yeqing Ying (4)
  Qingpo Liu (1)
  
  1. College of Agriculture and Food Science, Zhejiang A & F University, Linn Hangzhou, 311300, China
  2. College of Environmental and Resources Science, Zhejiang University, Hangzhou, 310058, China
  3. National Center for Quality Supervision and Testing of Rice Wine, Shaoxing, 312000, Zhejiang, China
  4. College of Forestry and Biotechnology, Zhejiang A & F University, Linn Hangzhou, 311300, China
  
• ISSN：1614-7499

文摘

Chronic exposure to arsenic (As) in rice has raised many health and environmental problems. As reported, great variation exists among different rice genotypes in As uptake, translocation, and accumulation. Under hydroponic culture, we find that the Chinese wild rice (Oryza rufipogon; acc. 104624) takes up the most arsenic among tested genotypes. Of the cultivated rice, the indica cv. 93-11 has the lowest arsenic translocation factor value but accumulates the maximum concentration of arsenic followed by Nipponbare, Minghui 86, and Zhonghua 11. Higher level of arsenite concentration (50) can induce extensive photosynthesis and root growth inhibition, and cause severe oxidative stress. Interestingly, external silicate (Si) supplementation has significantly increased the net photosynthetic rate, and promoted root elongation, as well as strongly ameliorated the oxidative stress by increasing the activities of antioxidant enzymes superoxide dismutase, ascorbate peroxidase, and peroxidase in roots and/or leaves of 93-11 seedlings. Notably, 1.873mM concentration of Si considerably decreases the total As uptake and As content in roots, but significantly increases the As translocation from roots to shoots. In contrast, Si supplementation with 1.0mM concentration significantly increases the total As uptake and As concentrations in roots and shoots of 93-11 seedlings after 50 arsenite treatment for 6days.