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United States Department of Agriculture

Agricultural Research Service

Title: Phytoalexins from Kenaf: Toxicity of Hibiscanone and Its Hydroquinone Towards the Plant Pathogen Verticillium Dahliae

Authors
item Puckhaber, Lorraine - TEXAS A&M UNIVERSITY
item Stipanovic, Robert
item Bell, Alois

Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 5, 1996
Publication Date: N/A

Technical Abstract: Hibiscanone (HBQ) is a phytoalexin produced by kenaf in response to infection by the wilt disease pathogen Verticillium dahliae. ED50 bioassays using V. dahliae conidia in buffered nutrient media indicate that HBQ is at least an order of magnitude more toxic to the wilt pathogen than any known phytoalexin produced by cotton. 13C-NMR experiments revealed that HBQ is reduced to its hydroquinone by V. dahliae conidia. Bioassays of HBQ and its hydroquinone (the latter prepared by glutathione reduction of HBQ) established that the quinone is considerably more toxic to V. dahliae than is the hydroquinone.

Last Modified: 10/21/2014