Add time:08/04/2019         Source:sciencedirect.com

Evidence is presented indicating that the bean pathogen Fusarium solani f. sp. phaseoli is able to metabolize the phytoalexin Phaseollin (cas 13401-40-6) in vitro. Phaseollin is metabolized in shake cultures of actively growing mycelium exposed to a concentration non-inhibitory to growth. An inhibitory concentration of phaseollin is likewise rapidly metabolized, provided the fungus is first allowed to adapt during exposure to a non-inhibitory dosage. Germinating spores can also metabolize phaseollin. Disappearance of phaseollin is accompanied by the appearance of several metabolic products. The most prominent of these, compound B (C20H18O5), differs from phaseollin in that its mass is 16 units higher and it has a carbonyl group, which suggested that it was an oxidation product of phaseollin. Compound B is less fungitoxic than phaseollin. It is suggested that F. solani f. sp. phaseoli is able to detoxify phaseollin by an inducible oxidizing system.

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