Etiology and physiology of stain, a ‘Fuji’ apple peel disorder
J. Mattheis, X. Fan, and Y. Gong
Proceedings of 26th International Horticultural Congress. Volume of Abstract . Toronto, Canada, 11-17 August, 2002. Abstract S04-P-97. pp. 155.
2002
บทคัดย่อ
Stain is a peel disorder of ‘Fuji’ apples that usually develops during storage. The disorder typically occurs on the blush side of fruit often at the margin of sunburn. Stain appears to be induced by sunlight as bagging reduces the incidence of stain. To determine when the injury leading to stain occurs, fruit were bagged at 14-day intervals from July through October, then bags were removed 14 days later. All fruit were harvested in late October and stored at 0 0C. The incidence of skin decreased relative to non-bagged fruit in fruit bagged in late September and October. Exposing fruit to UV-B light then stored at 0 0C developed the most stain when harvested in late September and October. The development of stain following postharvest UV-B treatment is temperature dependent. Stain incidence increased as storage temperature decreased following postharvest UV-B treatment. A postharvest dip in 2 or 4% CaCl2 or infiltration with 2% CaCl2 significantly reduced stain during air storage. Other treatments (DPA, AVG, 1-MCP, methyl jasmonate) do not consistently reduce stain development. Storage in low O2 (1-2 kPa) with up to 5 kPa CO2 reduces stain development compared to fruit stored in air.