Effect of Preharvest and Postharvest 1-Methylcyclopropene (1-MCP) Treatments on Fruit Quality Attributes in Cold-stored 'Fuji' Apples

초록

This work was carried out to evaluate the effects of preharvest 1-methylcyclopropene (1-MCP, Harvista (TM)) and postharvest 1-MCP (SmartFresh (TM)) treatments on the fruit quality attributes of cold-stored 'Fuji' (Malus domestica Borkh.) apples. Fruits were exposed to 0, 95, 125, or 250 mg.L-1 Harvista (TM) at 3, 2, 1 weeks before harvest (WBH), and treated with 0 or 1 mu L.L-1 SmartFresh (TM) at harvest. Fruit was then stored for up to 180 days at 0 +/- 1 degrees C. Fruit fresh weight, Hunter's value a, internal ethylene concentration (IEC), flesh firmness, titratable acidity (TA), and soluble solids content (SSC) in fruit treated with Harvista (TM) were not different from those of control fruit at harvest. During cold storage, flesh firmness and TA were higher in fruit treated with 250 mg.L-1 Harvista (TM) at 2 and 3 WBH than in control fruit. IEC was 5.5-10.0% lower in fruit treated with 250 mg.L-1 Harvista (TM) at 2 and 3 WBH compared with control fruit as storage duration progressed, while SSC was not affected. Furthermore, flesh firmness, TA, and IEC were affected neither by Harvista (TM) nor Harvista (TM) + SmartFresh (TM) treatments, compared with those fruit quality attributes at harvest. The correlation maps indicated that IEC was negatively correlated with firmness and TA, regardless of Harvista (TM) application levels. In addition, positive correlations between fruit quality attributes were detected in treatments with 250 mg.L-1 Harvista (TM) + SmartFresh (TM). Therefore, the results suggest that with a single application of SmartFresh (TM), a higher level of Harvista (TM) application would help in retention of fruit quality attributes during cold storage.

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