"Phaeomoniella chlamydospora"-Grapevine Interaction : Histochemical Reactions to Fungal Infection

Histochemical reactions of one-year-old potted micropropagated vines (rootstock 1103 Paulsen) to inoculationwith Phaeomoniella chlamydospora were studied. Microscopic examination of the vine wood showed that thefungus spread through the wood tissue, albeit slowly. Starting from the roots it required nine months to colonise thefirst 20-25 cm of the grapevine stems. The slow spread of P. chlamydospora is thought to be due to the defenceresponse initiated by the vines: production of tyloses, including accumulation of phenols in the vessels and adjacenttissue, and the deposition of unidentified defence-response substances, probably stilbene-like substances from thecell-wall surrounding the infection