Channel-Forming Peptaibols Are Potent Elicitors of Plant Secondary Metabolism and Tendril Coiling We gratefully acknowledge the gift of ampullosporin A, bergofungins A-C, and the chrysospermins from Prof. U. Gräfe (Hans-Knöll Institute for Natural Products Research, Jena), and we thank Dr. T. Nürnberger (Institute for Plant Biochemistry, Halle) for a sample of systemin.