Alleviation of chilling injury of mango fruits in cold storage by using exogenous putrescine.
Zhang ZhaoQi, Li XuePing, Hong HanJun, Ji ZuoLiang
Author Affiliation: Department of Horticulture, South China Agricultural University, Guangzhou 510642, Guangdong, China.
Fujian Journal of Agricultural Sciences 15 : 32-36
Abstract : The effect of exogenous putrescine (PUT) on chilling injury of mango (Mangifera indica) fruits during cold storage was studied. Harvested fruits were stored under conditions of 2±0.5°C, 10±0.5°C and 2±0.5°C + PUT. Results indicated that low temperature (2±0.5°C) induced an increase in endogenous polyamine level and ethylene production by fruits, significantly decreased superoxide dismutase (SOD) activity in the pericarp, and continuously increased malondialdehyde (MDA) content and membrane permeability. Treatment with exogenous PUT increased endogenous polyamine level, inhibited ethylene production and maintained SOD activity in the pericarp at a higher level, thus retarding the increase of MDA content and membrane permeability, and postponing the occurrence of chilling injury. Fruits stored at 10°C also showed an ethylene peak, and their MDA content and pericarp membrane permeability gradually increased during storage, which is the normal physiological response of ripening.