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| DOI：10.13522/j.cnki.ggps.2017.0319 |
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| Effects of Exogenous NO on the Drought Resistance Physiological Indexes of Maize Seeding Leaves under Drought Stress |
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XU Xinjuan, WANG Yongzhi, LI Zhaoju, SHAN Changjuan
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Henan Institute of Science and Technology, Xinxiang 453003, China; Collaborative Innovation Center of Modern Biological Breeding, Henan Province, Xinxiang 453003, China; Sanmenxia Polytechnic, Sanmenxia 472000, China
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| Abstract: |
| 【Objective】 Identify the application effect of exogenous NO on drought resistance of maize.【Method】The effects of exogenous NO on the main drought resistance physiological indexes of maize seedlings leaf under drought stress were studied by using PEG-6000 simulated drought stress and sodium nitrate (SNP) as NO donor. 【Result】Drought stress significantly increased the content of leaf hydrogen peroxide (H2O2), malondialdehyde (MDA), glutathione (GSH) and ascorbic acid (Vc)（p<0.05）, and enhanced the activity of glutathione peroxidase (GPX), ascorbate peroxidase (APX) and glutathione reductase (GR)；the drought stress significantly decreased the activity of superoxide dismutase (SOD) and catalase (CAT)（p<0.05）. Different SNP concentrations had no significant effect on glutathione (GSH) content, but significantly reduced the content of H2O2 and MDA（p<0.05）. The Vc content of 50 μmol/L and 100 μmol/L SNP was significantly increased by 13.4% and 16.1% （p<0.05）, respectively, but 150 μmol/L SNP had no significant effect on Vc content. Moreover, the activity of SOD, CAT, GPX and APX were significantly increased under different concentrations of SNP（p<0.05）. 【Conclusion】 Therefore, exogenous NO can enhance the drought resistance of maize seedlings by improving the antioxidant ability and alleviating the oxidative stress caused by drought. |
| Key words: NO; drought stress; antioxidant stress; antioxidase; maize |
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