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| Effects of cadmium or chromium on growth and NADPH oxidase and antioxidant enzyme system of foxtail millet seedlings |
| Received:September 11, 2015 |
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| KeyWord:cadmium;chromium;NADPH oxidase;foxtail millet |
| Author Name | Affiliation | E-mail | | TIAN Bao-hua | School of Life Science, Shanxi University, Taiyuan 030006, China | | | ZHANG Yan-jie | School of Life Science, Shanxi University, Taiyuan 030006, China | | | ZHANG Li-ping | School of Life Science, Shanxi University, Taiyuan 030006, China | | | MA Xiao-li | School of Life Science, Shanxi University, Taiyuan 030006, China | | | JIN Zhu-ping | School of Life Science, Shanxi University, Taiyuan 030006, China | | | LIU Zhi-qiang | School of Life Science, Shanxi University, Taiyuan 030006, China | | | LIU Dan-mei | School of Life Science, Shanxi University, Taiyuan 030006, China | | | PEI Yan-xi | School of Life Science, Shanxi University, Taiyuan 030006, China | peiyanxi@sxu.edu.cn |
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| Abstract: |
| Different heavy metals can induce various stress tolerance mechanisms in plants. Here a solution culture was used to investigate the effects of different concentrations of cadmium(Cd) or chromium(Cr) on growth, hydrogen peroxide(H2O2), chlorophyll, malondialdehyde(MDA) concentration, NADPH oxidase and antioxidant enzyme activities of foxtail millet seedlings. Results showed that plant height, root length and chlorophyll content were inhibited by Cd or Cr. Content of H2O2 and MDA was increased under Cd or Cr stresses. Increasing Cd or Cr concentrations increased NADPH oxidase activity in roots and leaves by inducing the expression of related genes, Sirboh D and Sirboh F, and peroxidase(POD), catalase(CAT) and ascorbate peroxidase(APX) activities at high concentrations. Superoxide dismutase(SOD) activity increased at low Cd or Cr concentrations, whereas it decreased at high concentrations. These results indicate that heavy metal stresses in foxtail millet alter physiological parameters, and cause various plant damages, but may also increase antioxidant enzyme activities, thus protecting the plant from further damages. |
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