Polyamines (PAs) participate in the defense reaction against several environmental conditions that causes oxidative stress.Solar radiation stress is common in many fruit-growing regions of the world and produces an apple physiological disorder called sunburn which causes severe crop loss every year.The aim of this work was to study PAs role in sunburn apples skin in North Patagonia.Red Delicious apples maturity indices were determined at harvest time in healthy (HS) and slight sunburn side (SS) of the fruit.