The effects of low partial pressures oxygen (pO2) on metabolism and fermentation-related gene expression 'Empire', 'Jonagold' and, 'Fuji' apples have been investigated. Fruit were stored in 0.5, 1.0, 1.5 kPa O2 (with 1 CO2) at 0.5 °C for up to 6 months. During storage the lowest internal ethylene concentrations observed ‘Empire’ ‘Fuji’, but pO2 did not affect those ‘Jonagold’. flesh firmness ‘F...