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Background  Resveratrol is an important stilbene that benefits human health. However, it is only distributed in a few species including grape and is very expensive. At present, grape has been an important source resveratrol. However, the details are scarce on resveratrol distribution in different  Vitis  species or cultivars.    Methodology/Principal Finding  The composition and content of resveratrols were investigated by HPLC for assessing genotypic variation in berry skins and leaves of 75 grape cultivars, belonging to 3 species and 7 interspecific hybrids.  Trans -resveratrol,  cis -piceid and  trans -piceid were detected in berry skins and leaves, but  cis -resveratrol was not. Resveratrol content largely varied with genetic background as well as usage. In most cultivars, total resveratrol including the above three compounds was higher in berry skins than leaves. In berry skins of most cultivars and leaves of almost all cultivars,  cis -piceid was the most abundant resveratrol;  trans -resveratrol and  trans -piceid were minor components. Some specific cultivars were found with extremely high levels of  trans -resveratrol,  cis - piceid,  trans -piceid or total resveratrols in berry skins or leaves. In skins and leaves, rootstock cultivars had a higher content of total resveratrols, and the cultivated European type cultivars and their hybrids with  V. labrusca  had relatively low totals. There were no significant correlations of the amounts of total resveratrols or any individual resveratrol between berry skins and leaves. All 75 cultivars can be divided into four groups based on the composition of resveratrols and their concentration by principal component analysis.    Conclusion  Resveratrol content of grape berries and leaves varied largely with their genetic background and usage. Rootstock cultivars had a higher content of total resveratrols than the other germplasm. Total resveratrols were lower in leaves than berry skins in most cultivars.  Cis -piceid was the most abundant resveratrol in most cultivars, and  trans -res and  trans -pd were minor components.

Resveratrols in Grape Berry Skins and Leaves in Vitis Germplasm