| Abstract
| - The content of selected phenolic compounds including resveratrol (trans-3,5,4‘-trihydroxystilbene)and its cis-isomer and glucosides (piceides) were monitored in grape (Vitis vinifera L. cv. Corvina)berry skin during ripening in the vineyard and in response to the post-harvest drying process(wilting). Four wilting conditions were compared (traditional, mixed, low-temperature, and high-temperature) to verify the eliciting effect of drying on resveratrol production. During fruit ripeningthe cis-piceid was the major stilbene found in berry skins, and a weak accumulation of stilbenesynthase (STS) mRNA was observed, whereas UV-light irradiation greatly stimulated STS transcriptof unripe berries. A time-course experiment showed the highest STS mRNA accumulation andresveratrol content (34 μg/g fresh weight at 58 days) occurring in berry skins in a mixed wiltingprocess. Keywords: Resveratrol; stilbenes; grape berry; grape skin; ripening; stilbene synthase (STS); UV;wilting
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