Physiological Response of Barley to Drought Stress during Seed Germination Period and Drought Resistance Evaluation

The responses of malondialdehyde,proline,soluble sugar,soluble protein,catalase,peroxidase and superoxide dismutase to drought stress and the drought resistance of 4 barley varieties were studied by utilizing 4 barley varieties with different drought resistance treated with different PEG8000 concentrations(0 %,5 %,10 %,15 % and 20 %) as drought stress,and the indices of drought resistance were screened in this paper.The results showed that the activity of superoxide dismutase and the contents of malondialdehyde,proline,soluble sugar,soluble protein increased significantly with the increase of drought stress;the activities of catalase and peroxidase firstly increased,then decreased;the suitable PEG8000 concentration for drought resistance identification was 20 %;the pecking order of drought resistance was Z037P017Q-1,Z182U038V,Z039P046Q and Z027S078T;the activities of catalase,peroxidase and superoxide dismutase could be used as an effective identification indices for drought resistance during seed germination period.