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Appl Environ Microbiol. 1992 August; 58(8): 2505-2508

Lipoxygenase inhibitors shift the yeast/mycelium dimorphism in Ceratocystis ulmi.

E C Jensen, C Ogg and K W Nickerson

School of Biological Sciences, University of Nebraska, Lincoln 68588.

ABSTRACT

The yeast-mycelium dimorphism in Ceratocystis ulmi, the causative agent of Dutch elm disease, was switched by gossypol, nordihydroguaiaretic acid, and propylgallate. In each case the mycelial form was converted to the yeast form. These compounds are recognized lipoxygenase inhibitors. Inhibitors of cyclooxygenase and thromboxane synthetase did not cause mycelia to shift to the yeast form. We suggest the following two-part hypothesis: (i) that lipoxygenase is a target for antifungal antibiotics and (ii) that many phytoalexins (antimicrobial compounds of plant origin) are targeted toward fungal lipoxygenases. In addition, in a study to determine potential lipoxygenase substrates, a fatty acid analysis indicated that C. ulmi conidiospores contained high levels of oleic, linoleic, and linolenic acids but no arachidonic acid.

Appl Environ Microbiol. 1992 August; 58(8): 2505-2508




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