Abstract: The effects of hydrogen peroxide on the induced disease-resistance of tomato fruits by cold-shock treatment were studied.Cold-shock treatment could induce the disease-resistance of tomato fruits,enhance the endogenous H2O2 content in the beginning of storage and increase the activity of GST.Furthermore,cold-shock could induce the activities of some anti-disease enzymes,including PAL,chitinase and β-1,3 glucanase.The inducement of H2O2 content and activity of GST could be accelerated by pretreatment with H2O2 before cold-shock,which promoted the induction of anti-disease enzyme activities.All of the inductions were inhibited by pretreatment with dimethylthiourea before cold-shock.In conclusion,the cold-shock treatment could induce the disease-resistance of postharvest tomato fruits,and hydrogen peroxide played an important role in the progress.

Key words: tomato, cold-shock, disease, hydrogen peroxide, anti-disease enzyme