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In vitro effects of the polyamine biosynthesis inhibitor, α‐difluoromethylornithine, on ornithine decarboxylase activities from three plant pathogenic fungi

The effects of α‐difluoromethylornithine (DFMO) on in vitro ornithine decarboxylase (ODC) activities from three plant pathogenic fungi, Pyrenophora avenae, Pyricularia oryzae and Uromyces viciae‐fabae, were studied. DFMO concentrations from 0·01 to 1·0 mmol/l produced no significant effects on ODC activities from the three fungi. However, increasing the DFMO concentration to 5 mmol/l produced a substantial reduction in in vitro ODC activity from Pyre, avenae. The ODC inhibitor, α‐monofluoromethylornithine (2 mmol/l), significantly reduced in vitro ODC activity from Pyre. avenae, whereas RR‐methyl acetylenic putrescine, an ODC inhibitor based on putrescine, produced no significant effect on the fungal enzyme.