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Kenaf Phytoalexin:  Toxicity of <i>o</i>-Hibiscanone and Its Hydroquinone to the Plant Pathogens <i>Verticillium </i><i>dahliae</i> and<i> Fusarium oxysporum</i> f. sp. <i>vasinfectum</i>

Lorraine S. PuckhaberSoil and Crop Science Department, Texas A&M University, and Southern Crops Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 2765 F&B Road, College Station, Texas 77845Robert D. StipanovicSoil and Crop Science Department, Texas A&M University, and Southern Crops Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 2765 F&B Road, College Station, Texas 77845Alois A. BellSoil and Crop Science Department, Texas A&M University, and Southern Crops Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, 2765 F&B Road, College Station, Texas 77845
1998en
ABI

Abstract

o-Hibiscanone (HBQ) is a phytoalexin produced by kenaf in response to infection by the wilt pathogen Verticillium dahliae. In several bioassays utilizing both conidia and mycelia of V. dahliae, HBQ was significantly more toxic than desoxyhemigossypol, the most potent phytoalexin produced by cotton. HBQ also was more toxic to conidia of Fusarium oxysporum f. sp. vasinfectum. 13C-NMR experiments revealed that HBQ is reduced to its hydroquinone by V. dahliae conidia. Bioassays of HBQ and its hydroquinone established that the quinone is considerably more toxic to V. dahliae than is the hydroquinone. This biotransformation apparently represents a detoxification mechanism employed by the pathogen. Keywords: Hibiscus cannabinus; fungicide; cotton; Gossypium; phytoalexin detoxification

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DOI
10.1021/jf980385t

Citations and references

Cited by 20 references
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