Ripening, storage temperature, ethylene action, and oxidative stress alter apple peel phytosterol metabolism

► Phytosterols, phytosteryl conjugates identified in apple peel. ► Evaluated against necrosis (scald) altering treatments during storage. ► ASG, SE levels, scald altered by temperature, stress, ethylene. ► ASGs increased in conditions also inducing scald. ► ASG and SE biosyntheses may be linked.