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Physiology and Biochemistry

Metabolism of Capsidiol by Sweet Pepper Tissue: Some Possible Implications for Phytoalexin Studies. A. Stoessl, Agriculture Canada, Research Institute, University Sub Post Office, London, Ontario, Canada N6A 5B7; J. R. Robinson(2), G. L. Rock(3), and E. W. B. Ward(4). (2)(3)(4)Agriculture Canada, Research Institute, University Sub Post Office, London, Ontario, Canada N6A 5B7. Phytopathology 67:64-66. Accepted for publication 26 July 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-64.

The sweet pepper (Capsicum frutescens) phytoalexin capsidiol is metabolized to an appreciable extent by healthy pepper tissue. Gas-chromatographic analyses, and tracer experiments employing 14C-capsidiol, showed the disappearance of one-third to two-thirds of capsidiol that had been added aseptically to pepper fruit. Almost all of the radioactivity not recovered in the form of capsidiol was recovered in a hydrophilic form. Some implications of these findings for current work on phytoalexins are discussed.

Additional keywords: Capsicum frutescens, secondary metabolites, metabolic turnover.