The Phytoalexin Desoxyhemigossypol: Mode of Action Against Verticillium Dahliae

M. E. Mace, R. D. Stipanovic


Catalase strongly inhibits the toxicity of the cotton phytoalexin desoxyhemigossypol (dHG) cotton against Verticillium dahliae. Since catalase destroys hydrogen peroxide (H2O2) it appears H2O2 is an essential compound in expression of the toxic action of dHG. H2O2 is produced during the decomposition of dHG. The actual toxic entity may be H2O2 itself or the hydroxy radical (HOú) derived from it. Superoxide (O2ú ) does not appear to be involved in the toxic activity since superoxide dismutace does not decrease toxicity. Reduced glutathione also inhibits dHG toxicity presumably by retarding the oxidation of dHG.

Reprinted from Proceedings of the 1994 Beltwide Cotton Conferences pg. 272
©National Cotton Council, Memphis TN

[Main TOC] | [TOC] | [TOC by Section] | [Search] | [Help]
Previous Page [Previous] [Next] Next Page
Document last modified Sunday, Dec 6 1998