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It has been reported that temperature conditioning (TC), intermittent warming (IW), and film wrapping (FW) reduce chilling injury (CI) on grapefruit. Our objective was to determine if IW, FW, and vapor heat (VH) affected the composition of the epicuticular wax of grapefruit similar to the effects we previously reported with TC. Waxes were analyzed by gas chromatography. C 25  to C 34  aldehydes and alkanes decreased in all treatments in 5C storage for 21 days. Squalene increased in both the TC (7 days at 21C) and VH (43.5C for 4 hr) treatments. Terpenoids increased in both the TC and IW (4 cycles of 5 days at 5C and 2 days at 21C) treatments, and the greatest increase in C 24  aldehyde occurred in the TC treatment. A VH-TC sequential treatment kept C 27  to C 34  aldehydes at fresh fruit levels following 5C storage. FW did not cause any wax increase. It is possible that these wax changes may have a role in reducing CI.

TEMPERATURE CONDITIONING, INTERMITTENT WARMING, VAPOR HEAT, AND FILM WRAPPING AFFECT GRAPEFRUIT WAX