Combined pre-storage heat treatment and controlled atmosphere storage reduced internal breakdown of 'Flavorcrest' peach

Chilling injury is a limiting factor for commercial life of peach fruit (Prunus persica (L.) Batsch). High CO, controlled atmosphere storage (CA) is a proven technology to overcome the disorder, while pre-storage heat treatment appear like an emerging alternative although showing some undesirable side effects. The objective of this experiment was to combine both CA and pre-storage heat treatment to improve control of chilling injury. 'Flavorcrest' fruit were heat treated for 24 h at 39 +/- 1 degrees C (HT) or maintained at 0 +/- 1 degrees C (HC) followed by cold storage with two levels of CA, 5% O-2 + 15% CO2 (MI); 5% O-2 + 20% CO2 (MA) or air (AIR). Firmness, juice content and flesh color were evaluated 4 days after harvest and after 3 and 4 weeks of storage. Control fruit (HC + AIR) showed '' leatheriness '' after 3 weeks; by this time HT, MI and MA, alone or combined were enough to overcome the problem; by 4 weeks only fruit receiving MI or MA softened adequately. Combined treatments were useful for improving juiciness and were the only alternative to reach 4 weeks with commercial quality. Although heat treated fruit had generally redder flesh than others, this side effect was reduced by CA. (c) 2006 Elsevier B.V. All rights reserved.