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Fomannoxin [(+/-)-5-Formyl-2-isopropenyl-2,3-dihydrobenzofurane] is a phytotoxic secondary metabolite, which is produced by the forest pathogenic basidiomycete Heterobasidion annosum during the infection process. Fomannoxin shows growth-inhibiting effects on callus and suspension cultures of conifer cells. By investigating the interaction of the phytotoxin with Pinus sylvestris cells a detoxification of fomannoxin was detected, presumably as a defense reaction of the plant cells. Undifferentiated green cell lines of Pinus sylvestris were used as target cells. To provide rac-fomannoxin as a substrate a simple method for the chemical synthesis was developed. It was found that the aromatic aldehyde group is reduced by the plant cells producing the non-toxic fomannoxin alcohol which was isolated and identified by spectroscopy. After longer incubation times, also fomannoxin acid-beta-glucoside could be isolated as another detoxification metabolite. For comparison this glucoside was also synthesized.

Biotransformation of the Fungal Toxin Fomannoxin by Conifer Cell Cultures