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《Acta Botanica Boreali-Occidentalia Sinica》 2009-06
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Regulation of Exogenous H_2O_2 on Rice Seedlings Chilling Tolerance

HAN Na1,FENG Han-qing2,LI Yan-hong1,LI Hong-yu1 (1 MOE Key Laboratory of Arid and Grassland Ecology,School of Life Sciences,Lanzhou University,Lanzhou 730000,China;2 College of Life Science,Northwest Normal University,Lanzhou 730070,China)  
After 12 h of chilling stress at 6℃,pretreatment with H2O2 0~20 mmol·L-1 as foliar spray under normal growth conditions was measured.The results indicated that 0~8 mmol·L-1 H2O2 could significantly enhance relative water content (RWC) and decrease relative membrane penetration.The obvious effect of H2O2 occurred at 4 mmol·L-1.After chilling stress,compared with water-treated seedlings (contro1),4 mmol·L-1 H2O2 pretreatment relieved the wilting degree,increased total respiration rate (Vt),capacity of alternative pathway (Valt),inhibited the malonaldehyde (MDA) content and increased the soluble sugar content,soluble protein content and proline content.However,pretreatment of rice plants with 4 mmol·L-1 H2O2 showed no obvious effect on endogenous H2O2 content and the generating rate of O-·2.These results suggest that the exogenous H2O2 could enhance rice seedlings chilling tolerance by enhancing respiration rate,the metabolism of carbohydrate and nitrogen and decreasing lipid peroxidation.The exogenous H2O2 was independent with the endogenous reactive oxygen species (ROS) pool in a certain way.
【Fund】: 国家自然科学基金项目(30471133 30670070)
【CateGory Index】: S511
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