Effects of Drought Stress on Physiological and Biochemical Indices of Drought-resistance in Genetically Modified Rice Tillering Stage

[Objective] To study the drought resistance of 777(a kind of rice with OsCAS gene overexpression),we compared the physiological and biochemical indices of drought-resistance between the WT(a kind of wild rice,Nipponbare rice) and 777.[Method] Two different drought resistant varieties were treated by 10% and 15%PEG.Their CAT,SOD and POD activity and Pro and MDA contents were measured.[Result] The results indicated that under 10% PEG treatment,the CAT,SOD and POD activity were increased in both WT and 777.Under 15% PEG treatment,the CAT,SOD and POD activity decreased in WT but maintained relatively higher level in 777.In the two different varieties,the MDA and Pro content augmented with PEG concentration increasing.There were more Pro and MDA in WT than 777 under the same drought stress.[Conclusion] In tillering stage,the 777 has a stronger ability to resistant the drought stress than the WT,especially under serious drought stress(15%PEG).