Fruit Physiological Disorders
Peach and Nectarine: Packinghouse Skin Burning
H. Crisosto and E. J. Mitcham. UC Davis Postharvest Specialists.
Importance: Skin burning is a type of skin discoloration that has become a frequent problem on specific susceptible peach and nectarine cultivars. Rejections due to skin burning can reach as high as 50%. Our results from observations over several years indicate that peach and nectarine skin discolorations, field inking and skin burning, are both triggered by a combination of physical damage during harvesting-hauling combined with different postharvest stresses. However, although field inking and skin burning disorders have similar symptoms, they have different triggers and different biological mechanisms of development and therefore it is important to understand the differences between both cosmetic skin disorders.
Symptoms and Causes: Skin burning symptoms appear as brown and/or black areas that are restricted to the skin. In contrast to field inking, these symptoms are mainly triggered during packing operations, principally at the brushing-washing point, although abrasion that occurred prior to packing will also contribute to its development. Specifically, the damage is triggered by exposure to high pH and/or dehydration caused by high-velocity, forced-air cooling during packing. Symptoms can be observed very soon after packing, but the symptoms rapidly increase during cold storage due to dehydration. In fact, it has been observed that most of the intense skin damage in packed fruit occurred on the exposed part of the fruit above the tray receptacle and no damage occurred under the price-look-up (PLU) sticker. Our studies demonstrated that fruit skin phenolics in susceptible cultivars and breeding lines are not stable at high pH leading to phenolic transformations. These transformations at different pH values result from copigmentation of phenolics with anthocyanins resulting in a change in color of the anthocyanin compound and therefore discoloration of the skin.
Different susceptibilities to skin burning have been observed among peach and nectarine cultivars, depending mainly on the specific phenolics in their skin tissues.
Control of skin burning:
Cantin, C.M., Day, K., Crisosto, G.M. and Crisosto, C.H. 2009. Update on white flesh peach and nectarine skin burning discoloration. Central Valley Postharvest Newsletter 18(2): 2-5.
Crisosto, C.H., Cantin, C. M. and Suslow, T. 2009. The importance of adjusting your water chlorine pH during your brush-washing operation for the San Joaquin Valley stone fruit industry. Central Valley Postharvest Newsletter 18(3): 1-5.
Cantín, C.M., Tian, T., Xiaoqiong, Q. and Crisosto, C.H. 2011. Copigmentation triggers the development of skin burning disorder on peach and nectarine fruit [Prunus persica (L.) Batsch]. Journal of Agricultural and Food Chemistry, 59, 2393-402. dx.doi.org/10.1021/jf104497s.
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