Abstract:In this experiment,artificially wounded yam tubers were treated at 5℃,15℃,25℃ and 35℃ for 7 days,respectively.The effects of different temperature treatments on the postharvest tissue structure,weight loss and disease resistance,disease resistance indicators related with metabolism of active oxygen and phenolic substance were studied.The results showed that in the range of 535℃,the corrugated polyphenols and lignin were accumulated in the wound section with the increase of treatment temperature.The treatment group with the high temperature of 35℃ accumulated the earliest and accumulated the most.The weight loss rate and incidence of yam tuber treated with callus at 35℃ were significantly reduced.The contents of hydrogen peroxide,total phenols and flavonoids,the production rate of superoxide anion,and activities of superoxide dismutase,peroxidase,polyphenol oxidase and phenylalanine ammonia lyase of the yam tuber under 35℃ were the highest among the treatments.It is indicated that the high temperature treatment of postharvest yam at 35℃ can improve the metabolism of active oxygen and phenolic of yam tubers,effectively promote the healing and disease resistance of yam tuber postharvest damage,and reduce postharvest rot.