Abstract: The effects of exogenous putrescine (PUT)treatment on chilling injury of mango (Mangifera indica L.)fruits in cold storage were studied in detail. The results indicated that the low temperature(2℃)induced the increase of the endogenous polyamines level and the ethylene production of mango fruits,significantly decreased SOD in pericarp,increased continuously the MDA content and the membrane permeability. The exogenous PUT increased the endogenous polyamines level,inhibited the ethylene production and maintained the SOD activity of pericarp at higher level,retarded the increase of the MDA content and the membrane permeability, and postponed the occurance of the chilling injury of mango fruits. The mango fruits in 10℃ storage also showed an ethylene peak,the MDA content and the membrane permeability of pericarp were gradually increased during storage, this is a normal physiological response of ripening.

Key words: Mangifera indica L, Chilling injury, PUT treatment, Oxidation metabolism, Ethylene release