MATURATION AND STORAGE OF FUJI APPLES (Malus domestica Borkh)

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  • 1 Dept. of Horticulture and Landscape Architecture, Washington State University, Pullman, WA 99164-6414. USDA-ARS, Tree Fruit Research Lab, Wenatchee, WA 98801. Dept. of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow ID 83843.

Several strains of Fuji apples were harvested weekly from September through October in 1990 and 1991, and evaluated for maturation and quality after 1 and 7 days at 20 °C following harvest and storage in atmospheres of 0.5%, 1.0%, 2.0% O2 and air. Results showed that Fuji apples have very low ethylene production rates and little firmness loss during maturation. A change in the postharvest respiration pattern preceded the increase ethylene synthesis. Oxygen concentration during storage directly affected apple respiration rate after removal from storage. Ethylene production rates and internal ethylene concentrations indicated that the apples were still in the preclimacteric stage after 7 to 9 months storage at 0.5%, 1.0%, or 2% O2. Fuji apples develop watercore and tend to have a particular type of corebrowing during maturation on the tree, or during and after storage. The cause is unknown.

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