Abstract
Hyphal wall components from Phytophthora infestans elicit a hypersensitive-like reaction from potato tuber protoplasts. Hyphal wall components also elicit accumulation of potato phytoalexins. It has been shown that arachidonic and eicosapentaenoic acids isolated from the fungus can also elicit phytoalexins in potato tubers. We found that arachidonic acid could elicit a response in protoplasts that was visually identical to the response caused by hyphal wall components. However, other unsaturated fatty acids not able to elicit phytoalexins in tubers were also effective on protoplasts. Furthermore, inhibitors reported to block the action of hyphal wall components on tuber protoplasts had no effect on the protoplast response initiated by treatment with arachidonic acid. The results are discussed in relation to the significance of lipid elicitors in triggering hypersensitive cell death in the potato.
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