Investigation on the Toxin Production by Several Blast Fungus Strains and Isolation of Tenuazonic Acid as a Novel Toxin

Abstract

A survey of the toxin production by several strains of blast fungus was carried out. Among the strains tested only one strain, C1(THU 69-03) produced α-picolinic acid with good yield and other strains produced neither α-picolinic acid nor piricularin. On the other hand, tenuazonic acid and its Fe-cbelate compound were isolated as novel blast fungus toxins from the surface culture brothes of these strains, but they could not be isolated from the shaking culture brothes. The phytotoxic effect of tenuazonic acid on rice plants in regard to varietal difference was also studied.