수확전 수체살포용 1-MCP 처리가 ‘후지’ 사과의 저온저장 중 과실 품질과 세포벽 대사에 미치는 영향

초록

This study was carried out to investigate the effects of a pre-harvest treatment with sprayable1-methylcyclopropene (S1-MCP) on fruit quality and cell wall metabolism during cold storage of‘Fuji’ apples (Malus domestica Borkh). Three different treatments, 95, 125, and 250 mg·L-1S1-MCP, applied at 1, 2, or 3 weeks before harvest, were used in this study. Fruit firmness ofuntreated fruit decreased from 62.3 Newton (N) at harvest to 55.3 N at 180 days after storage. However, a treatment with 250 mg·L-1 S1-MCP at 2 or 3 weeks before harvest maintained a highflesh firmness of 60 N even after 180 days of cold storage. The titratable acidity (TA) of untreatedfruit decreased rapidly from 0.36% at harvest to 0.19% at 180 days after storage, but the 125 and250 mg·L-1 S1-MCP treatment at 2 weeks before storage maintained the TA at 0.32-0.33% after 180days of cold storage. The internal ethylene concentration was significantly increased to 326.4μL·L-1 after 180 days of storage in untreated fruit, but it remained very low (17.3 and 32.4 μL·L-1)after storage when fruit were treated with 250 mg·L-1 S1-MCP at 2 and 3 weeks before harvest,respectively. The uronic acid content, which is a component of the cell wall middle lamella, inalcohol insoluble material (AIS) was higher (301.47 μg·mg-1·AIS-1) in the S1-MCP treated fruitafter 180 days of storage compared to the untreated fruit (271.72 μg·mg-1·AIS-1). The activities ofα- and β-galactosidase in cell wall hydrolases were significantly lower in S1-MCP treated fruit thanin the untreated fruit after 180 days of storage.

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