Effect of high-dose 290 nm UV-B on resveratrol content in grape skins

Abstract

UV-C irradiation increases resveratrol content in grape skins, but it reaches a maximum at a certain UV-C dose. In contrast, UV-B has a weak resveratrol-enhancing effect at low doses, but it has not been investigated at high doses. In this study, we investigated the effect of high-dose UV-B on resveratrol contents in grape skins. Irradiation of Muscat Bailey A with 290 nm UV-B LED at 22 500 and 225 000 μmol m−2 increased the resveratrol contents in the grape skins by 2.1- and 9.0-fold, respectively, without significant increases in other phenolic compounds. The effect was also confirmed for two other cultivars: Shine Muscat and Delaware. Transcriptome analysis of the grape skins of Muscat Bailey A immediately after irradiation with UV-B at 225 000 μmol m−2 showed that genes related to biotic and abiotic stresses were up-regulated. Hence, it was suggested that high-dose UV-B irradiation induces a stress response and specifically activates resveratrol biosynthesis.

Edible Coatings and Films for Preparation of Grapevine By-Product Infusions and in Freshly Processed Products

“…The study by Liu et al [217] showed that they have a neuroprotective effect. Resveratrol has also been found in grapes, and its responsibility for the low incidence of coronary heart disease and for preventing amyotrophic lateral sclerosis, cancer growth, and kidney aging [218] has been shown. Various studies have investigated different ways of reusing these benefits, like the creation of coatings with grape seed extract, grape pomace extract, and grape seed oil, the creation of coatings of grape or grape pomace, and the creation of coatings to grape and grape pomace to make infusions.…”