The effect of green leaf volatiles (GLVs; cis-3-hexenol and trans-2-hexenal) on the resveratrol production stimulated and nonstimulated by ultraviolet C (UV-C) irradiation was elucidated in the leaf discs of ‘Delaware’ grapes. Each GLV treatment slightly reduced resveratrol levels in the leaf discs. Pretreatment with cis-3-hexenol inhibited the resveratrol accumulation stimulated by UV-C irradiation irrespective of the concentration. On the other hand, pretreatment with trans-2-hexenal at low concentration augmented the levels of resveratrol increased by UV-C irradiation. These results suggest that trans-2-hexenal had a priming effect on the resveratrol accumulation stimulated by UV-C irradiation in grape leaf discs. The highest priming effect of trans-2-hexenal was found at 2.58 μM for 24 h exposure. Exposure times, from 2 to 24 h, of 4.3 μM trans-2-hexenal did not change the priming effect.
