| Effects of humic acid on activity of antioxidation system in wheat root under salinity alkalinity stress |
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| DOI：10.7606/j.issn.1000-7601.2011.06.40 |
| Key Words: wheat root salinity-alkalinity stress antioxidation system humic acid |
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| Abstract: |
| Neutral salt (NaCl) and basic salt (NaHCO3) were mixed to simulate different concentration salinity al-kalinity stress respectively，two kinds of genotype spring wheat (Longmai 26 and Kehan 16) were treated for soaking seed of humic acid. The content of oxygen free radicals, malondialdehyde (MDA) and glutathione (GSH)，and the activity of peroxidase (POD) and superoxide dismutase (SOD) of root were determined to investigate the control effects of HA on an tioxidant system of wheat root under salinity alkalinity stress. The results showed that the content of MDA and the activity of POD were increased, however, the activity of SOD were decreased, and the effect of salt stress was more than that of alkali stress. Soaking seed of humic acid reduced the acumulation reactive oxygen species (ROS)，increased the activity of POD and SOD in root，and promoted the synthesis of GSH. |