Study On The Responses 'Qinmei' And 'Hayward' Kiwifruits To 1-Methylcycloopropene

'Qinmei'is a main variety of kiwifruit grown in Shaanxi province,'Hayward'is the popular variety of kiwifruit grown in world, and is being expanded in Shaanxi in recent years. The responses of kiwifruit to 100nL?L-1 1-methylcyclopropene (1-MCP) treatment during the common storage and to 100nL?L-1 and 500nL?L-1 treatment during the cold storage were investigated. The ripening behavior and mechanism of softening of kiwifruits and the effects of 1-MCP were probed, and the potential application of 1-MCP to the commercial storage of kiwifruits was discussed. The main results as follows:(1) The change of flesh firmness of'Qinmei'and'Hayward'kiwifruits during both common storage and cold storage were differentiated two stages, fast softening at early storage and slow softening at later storage.'Hayward'kiwifruits with lower ethylene (C2H4) production, lower respiration rate and lower activity of PG enzyme softened slower than'Qinmei'kiwifruits. Therefore,'Qinmei'had only 7-days storage life and'Hayward'had 20-days storage life under common storage conditions, and'Qinmei'had only a 60-days storage life and'Hayward'had 120-days storage life at 0℃'Hayward'showed a better storability.(2) 1-MCP treatment after harvesting significantly inhibited the C2H4 production, and respiration rate of kiwifruits, which slowed down the decrease in flesh firmness and titratable acids and the increase in the total soluble solids and the activity of PG enzyme of kiwifruits during common storage and cold storage. Therefore, it prolonged kiwifruit's storage life. No significant difference was found between 100nL?L-1 and 500nL?L-1 1-MCP treatment. To reduce the postharvest cost, 100nL?L-1 1-MCP is recommended to the commercial storage of kiwifruits.(3) Maturity affected both flesh softening and the effects of 1-MCP. The firmness of kiwifruits with early maturity decreased slower than those with later maturity and had longer storage life; 1-MCP had better effect on the kiwifruits harvested around 6.5% total soluble solids content.