The Effect Of 1-MCP On Postharvest Physiology And Storage Of The Huanghua Pear

Having exploited Huanghua pear (Pyrus Pyrifolia Nakai) as material in this dissertation, the fruits were stored in the room (20±0.5℃)and cold(4±0.5℃)temperature afterl-MCP treatment of 500ppb, 750ppb and 1000ppb . Important physiology indexes, nutrition ingredients and critical enzymes were detected and assayed periodically. The effect of 1-MCP on the postharvest physiology and storage was researched. The results indicated:(1) In the room temperature storage, 1-MCP (500ppb, 750ppb and 1000ppb) can effectively delay the time of respiration and ethylene production climax of 7 days, reduce peak value of 14.73%, 13.86%, 24.43% and 31.18%, 35.48%, 44.09% respectively, suppress the decline of firmness and the changes of color, remain higher nutrition ingredients, decrease the activities of polyphenol oxidase and peroxidase, retain the flavor, texture, nutrition, color and taste of fruits inherent. The quality of fruits treated was better than that of the control. 1-MCP treatment can prolong the period of storage of 18-21 days comparing with the control.(2) In the room temperature storage, the advised application concentration was 1000ppb because 1000ppb 1-MCP has better effect than that of 500ppb and 750ppb.(3) In the cold storage, 1-MCP (500ppb, 750ppb and 1000ppb) can effectively delay the time of respiration and ethylene production climax of 14 days, reduce peak value of 16.90%, 19.75%, 21.48% and 27.54%, 28.99%, 33.33% respectively, suppress the decline of firmness and the changes of color, remain higher nutrition ingredients, decrease the activities of polyphenol oxidase and peroxidase, retain the flavor, texture, nutrition, color and taste of fruits inherent. The quality of fruits treated was better than that of the control. The treatment can prolong the period of storage of 21-24 days comparing with the control.(4) In the cold storage, three concentrations (500ppb, 750ppb and 1000ppb) had notdistinct difference, so the advised application concentration was 500ppb in view of the economic reason.