Abstract: In order to explore the physiological response mechanism of Physali alkekengi L. in different drought treatments,and provide scientific references for exploration and utilization of drought tolerant varieties, Lilitian and Tieba seedlings were used as materials. The physiological and biochemical characteristics of two kinds of Physalis were measured by PEG-6000（mass fraction 0,5%,10%,15%,20%,30%） simulation drought stress. The results showed that with the increasing concentration of PEG-6000,malondialdehyde（MDA） content showed a rising trend,superoxide dismutase（SOD） activity, peroxidase（POD） activity,catalase（CAT） activity,proline（Pro） content and soluble sugar content（SS） first increased and then decreased. The POD,CAT activity and soluble sugar content of Lilitian reached the highest value under the PEG-6000 treatment of 15% concentration,while the POD,CAT activity and soluble sugar content of Tieba reached the highest value at 20%,15% and 10% concentrations respectively. PEG-6000 concentration arrive at 20%,SOD activity and Pro content of two varieties of seedlings reached the maximum. Lilitian is better tolerated to PEG-6000 than Tieba.

Key words: Physali alkekengi L., PEG-6000, physiological characteristics