Abstract:

In this paper, the effects of different concentrations (100, 500, 1 000 mg·L^-1 ) of sodium hypochlorite solution water-curing treatment on physiological changes of chestnut (Castanea mollissima cv. Yanchang)were studied during postharvest MA storage. The results were as follows: 1) NaClO water-curing treatment could decrease respiratory intensity and amylase activity, but increase ADH activity of chestnut; 2) NaClO water-curing treatment could inhibit intra-PPO activity, extra-PPO activity was related with concentrations of NaClO solution. The extra-PPO activity of chestnut treated with 1 000 mg·L^-1 NaClO solution was higher than that of CK at all times. However, 100 mg·L^-1 or 500 mg·L^-1 NaClO solution water-curing treatment made extra-PPO activity lower than CK. 3) NaClO water-curing treatment could restrain intra-POD activity, extra-POD activity was related with concentrations of NaClO solution. Extra-POD activity of chestnut treated with 1 000 mg·L^-1 NaClO solution was higher than that of CK. However, extra-POD activity was lower in the early storage and higher in the later treated with 100 mg·L^-1 or 500 mg·L^-1 NaClO solution. 4) SOD activities were higher than CK by 100 mg·L^-1 NaClO or 500 mg·L^-1 NaClO solution treatment, but SOD activity was lower than CK by 1 000 mg·L^-1 NaClO solution treatment. 5) There were no differences between NaClO water-curing treatments and CK on the changing trends of CAT activities, but CAT activity was improved by NaClO water-curing treatment.

Key words: chestnut, sodium hypochlorite, water_curing treatment, respiratory intensity, enzyme activity