| Resveratrol contents in leaves, berries, shoots, secondary shoots and claspers of grape -vine Merlot and 8804 were determined with HPLC (High performance liquid chromatogr-aphy). Change of resveratrol content in leaves and berries were determined in different growth stages. The relationship between resveratrol content in leaves and downy mildew has also been discussed.The main results from this study were as followings:1 .Resveratrol content in leaves has two peaks during grapevine growth stages.Res-veratrol content was increased with leaves growing accordingly and reached to the first peak point at shoot vigorous growth stage. Then it declined with shoot growth being weaken. A short time before defoliation, it showed the second peak, finally declined. Resveratrol contents in leaves of Merlot and 8804 were 9.8602μg/g and 8.3450μg/g at their first peak and were 2.5996μg/g and 4.4369μg/g at their second peak respectively.2. Peak content of resveratrol was found once in berries. The content was increased with berries growing accordingly and reached the peak point just before ripeness. Its content declined when berries were ripe. The peak contents of resveratrol in berries of Merlot and 8804 were 1.2113μg/g and 0.9317μg/g respectively.3. Definite relationship was found between downy mildew and resveratrol content in leaves of grape. Resveratrol content in leaves infected by downy mildew was higher than that in healthy leaves. The content increased accordingly with the increasing infected area of leaves and reached the peak point when the severity of disease increased to the third grade (infected area of leaves is about 51 -75%). When the severity increased to the forth grade (infected area of leaves is above 75%), resveratrol content began declining. The peak contents of resveratrol in infected leaves of Merlot and 8804 were 18.6072μg/g and 12.3143μg/g respectively.4. Shoots, secondary shoots and claspers of grapevine contain some resveratrol and can be used for resveratrol extracting.
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