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Postharvest factors inhibit the skin blackening in 'Niitaka' pear fruit.

Yang, Y. J.; Lee, E. J.;

Postharvest Horticulture Series - Department of Pomology, University of California Year: 1997 Issue: No. 16 Pages: 298-304 Ref: 9 ref.

1997

บทคัดย่อ

Postharvest factors inhibit the skin blackening in 'Niitaka' pear fruit.

Skin blackening of Japanese pear [Pyrus pyrifolia] (cv. Niitaka) fruits is commonly induced when fruits are stored at low temperatures immediately after harvest. Fruits were harvested in Chonan, Korea Republic, in November 1996 and 1997 and stored in various controlled atmosphere (CA) storage conditions (1, 3, 10 or 50% CO2, 0 or 1 ppm ethylene, and 50 or 98% RH, with 20% O2 in all treatments) at 0 deg C. Hunter L value was decreased more in high CO2 treatments (10 and 50%) than in relatively low CO2 (1 and 3%). Ethylene production increased as CO2 concentration increased from 1 to 50%. Fruits supplied with external ethylene showed a non-climacteric behaviour. After 60 days' storage, no skin blackening was observed on fruits stored in 1% CO2 without ethylene (50 or 98% RH), but skin blackening was observed in fruits stored in 1% CO2 with ethylene (slight skin blackening appeared after 38 days' storage at 98% RH and moderate skin blackening appeared after 46 days' storage at 50% RH). Moderate ski

n blackening was observed after 20 days' storage in 3% CO2 with ethylene (50% RH) while only slight skin blackening was observed in 3% CO2 without ethylene (after 38 days' storage at 50% RH, and after 46 days' storage at 98% RH). Higher CO2 concentrations (10 and 50%) accelerated development of the disorder. High CO2 (10 and 50%) decreased firmness, titratable acidity and vitamin C [ascorbic acid] content. Flesh quality was little affected by external ethylene supply and RH conditions. The results suggest that skin blackening in Niitaka pear fruits is influenced primarily by ambient CO2 concentrations >1% and secondly by ethylene and high RH.