The effect of 1-methylcyclopropene (1-MCP) on the ripening of a native variety of soursop (Annona muricata L.) under refrigerated storage was evaluated. Control fruits were stored at 25 and 16C, and a group of fruits was exposed to 200 or 400 nL/L of 1-MCP and then stored at 16C. The effect of 1-MCP on soursop fruits stored at 16C (6 days) and then at 25C was also studied. Fruits stored at 25C ripened after 4-6 days. Fruits held at 16C ripened after 8-9 days; however, chilling injury symptoms were observed. 1-MCP caused a reduction in respiration and ethylene production rates and there was no visible chilling injury to the fruit pulp.In conclusion, application of 200 or 400 nL/L of 1-MCP on refrigerated soursop delayed ripening for 7 days, which should provide additional time to handle the fruit at least in the domestic market.
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