FCRR-Toxin, a Novel Phytotoxin from Fusarium oxysporum f. sp. radicis-lycopersici

Abstract

A new phytotoxin, FCRR (Fusarium crown and root rot)-Toxin was isolated from the culture filtrate of Fusarium oxysporum f. sp. radicis-lycopersici. The structure of FCRR-Toxin was established as I on the basis of spectroscopic evidence. The threshold concentration of induced leaf necrosis for "Momotaro, " a susceptible cultivar of tomato (Lycopersicon esculentum Mill.), by this toxin was found to be 0.25μg/ml.