Low oxygen treatment prior to cold storage decreases the incidence of bitter pit in 'Golden Reinders' apples

Abstract

BACKGROUND: The effect of subjecting 'Golden Reinders' apples to a low O2 pre-treatment (LOT; 1-2% O2) was evaluated as a strategy to decrease the rate of bitter pit (BP) incidence after standard cold storage (ST). Immediately after harvest, apples were stored for 10 days at 20°C under low O2. Thereafter, apples were cold-stored (0-4°C) for 4 months and changes were monitored in terms of BP incidence, fruit quality traits and mineral element concentrations. RESULTS: After 4 months cold storage, LOT apples presented a 2.6-fold decrease in the rate of BP incidence (14%) versus the values obtained for standard cold-stored fruits (37% BP incidence). LOT increased flesh firmness, total soluble solids and titratable acidity as compared to the quality traits determined for cold-stored fruits. Lower cortex Ca and Mg concentrations as compared to ST apples were determined in association with LOT, 2 months after cold storage. CONCLUSION: Application of a LOT prior to cold storage may be a promising strategy to reduce the incidence of BP and preserve fruit quality, which should be further investigated. © 2009 Society of Chemical Industry.