RESVERATROL PRODUCTION AS A PART OF THE HYPERSENSITIVE-LIKE RESPONSE OF GRAPEVINE CELLS TO AN ELICITOR FROM TRICHODERMA-VIRIDE

Suspension cell cultures of grapevine (Vitis vinifera, cv. Monastrell) treated with an elicitor (cellulase, Onozuka R-10) from Trichoderma v iride showed a hypersensitive-like response. This was characterized by cell plasmolysis and was accompanied by localized cell death, which w as concomitant with cell culture browning, itself probably due to an a ctivation of oxidative phenolic metabolism driven by a large increase in endogenous levels of H2O2. In addition to these responses, the trea tment of cell cultures with the elicitor produced an increase in amoun ts of benzoic acid and of resveratrol, the latter a potent phytoalexin of grapevines. This hypersensitive-like response was specific since n one of the above responses was obtained with other cell wall-degrading enzymes from several sources, or with inocula of either mycelial extr acts or culture filtrates of Botrytis cinerea. These results are discu ssed in the light of a disease-resistance reaction induced in grapevin e cells by a product of T. viride, a fungal agent characterized by its effective biocontrol of Botrytis cinerea, the causal agent of grey mo uld in grapevines.