Abstract
Resveratrol production potential was evaluated in the leaves and berries of Vitis ficifolia Bunge var. lobata (Ebizuru) and V. ficifolia Bunge var. ganebu (Ryuukyuuganebu), wild grapes native to Japan. Ultraviolet-C (UV-C) irradiation was used to stimulate resveratrol production. The resveratrol level in the nonirradiated leaf discs was 3.6 times higher in Ryuukyuuganebu than in Ebizuru, and the resveratrol level in the Ryuukyuuganebu leaf disc was 4.4 times higher after UV-C irradiation compared with Ebizuru. Resveratrol levels in the nonirradiated berries differed little between the varieties. The resveratrol level in the immature berries of both varieties increased significantly 24 hr after 15 min of UV-C irradiation. However, the resveratrol production stimulated by UV-C had a different pattern. The resveratrol production of Ebizuru declined during berry development and maturation, whereas that of Ryuukyuuganebu declined until veraison before it increased to almost the same level as that found during the most immature stage at harvest. An increased resveratrol level in the mature berries of Ryuukyuuganebu was also detected 48 hr after UV-C irradiation. UV-C irradiation had no effect on the piceid level of each variety. Ryuukyuuganebu is a wild grape with a distinctive resveratrol productivity pattern, especially in the berry.
- ©2012 by the American Society for Enology and Viticulture
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