VIEW ARTICLE

The Significance of Capsidiol Induction in Pepper Fruit during an Incompatible Interaction with Phytophthora infestans. D. R. Jones, Postdoctorate Research Fellow, Agriculture Canada, Research Institute, University Sub Post Office, London, Ontario, Canada N6A 5B7; C. H. Unwin(2), and E. W. B. Ward(3). (2)(3)Senior Technician, and Plant Pathologist, respectively, Agriculture Canada, Research Institute, University Sub Post Office, London, Ontario, Canada N6A 5B7. Phytopathology 65:1286-1288. Accepted for publication 10 June 1975. DOI: 10.1094/Phyto-65-1286.

In a time-course study of capsidiol accumulation during an incompatible interaction between pepper fruit tissue and Phytophthora infestans, concentrations of capsidiol in the tissue were totally inhibitory 24 hours after inoculation, as indicated by in vitro tests of mycelial growth inhibition. Capsidiol accumulated sufficiently rapidly therefore to account for the progressive restriction of hyphal growth observed in the ultrastructural study of the interaction previously reported. Capsidiol was shown to be fungistatic only, and other factors are presumably responsible for the subsequent death of hyphae in infected cells.