Abstract
Chitin, an important component of most fungal cell walls, elicited lignification in wheat leaves when applied as a suspension to wounds. The soluble derivatives ethylene glycol, chitin and chitosan were also active, but glucosamine, N-acetylglucosamine and small chitin oligomers did not elicit the response. The fungal glucan pullulan lacked activity, but laminarin, an algal glucan, was a weak elicitor. The response could also be elicited by fungal cell wall preparations. The possible role of chitin and related wall polymers in inducing host-defence mechanisms in wheat is discussed.
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