Anti-rice Blast Activity and Resistance Induction of C-18 Oxygenated Fatty Acids

Abstract

The effects of oxygenated fatty acids were recorded as ED₅₀ values for inhibition of germination and germ tube elongation of the spores of rice blast fungus. The oxygenated fatty acids were potent inhibitors between 20–40 ppm. When Sasanishiki rice plants were treated with the major components, epoxy-fatty acids, the rate of susceptible lesions formed on the leaves were lower than those of non-treated control, indicating induction of resistance to the pathogen by the epoxides in the plants. In addition, it was shown by an uptake experiment using [l-¹⁴C] derivatives that the epoxy-fatty acids were clearly incorporated into rice leaves.