Abstract
The effect of shortwave (250 nm) UV radiation (UV-C) on the level of peroxidase activity and peroxidase isoenzyme patterns in leaves of resistant ([Vitis vinifera x Viris riparia] x Vitis rupestris andVitis rupestris) and susceptible (Vitis vinifera) grapevine species toPlasmopara viticola (downy mildew) was studied. The results show that although UV-C did not produce significant changes in peroxidase activity in susceptible species, and only minor changes in resistant species, treatment with UV-light induces an acidic isoperoxidase (isoperoxidase A1), capable of oxidising 4-hydroxystilbenes in resistant species. It was named HSPrx 2. Since peroxidase is apparently the enzyme responsible for e-viniferin synthesis from resveratrol in grapevines, a close relationship between this peroxidase isoenzyme and e-viniferin synthesis which occurs in grapevine leaves after UV-C treatment must be expected.
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