Isolation and Identification of (-)-Jasmonic Acid from Wild Rice, Oryza officinalis, as an Antifungal Substance.

Abstract

As has been reported, antifungal or antibacterial substances such as momilactone,1* oryzalexin23) and oxygen- containing unsaturated fatty acids,4'5) and oryzalide6'7) have been isolated from cultivated rice plants as self-defense substances against microbial infection, i.e., Pyri-cularia and Xanthbmonascampestris, pv. oryzae. Somereports have demonstrated the resistance of wild rice species to P. oryzae8) and X. campestris,9) which are causal agents of rice blast and bacterial leaf blight disease, respectively. The isolation and identification of the antimicrobial substances in wild rice species, however, have yet been cultivated varieties and wild rice species based on a quantitative or qualitative analysis of their antimicrobial substances. Weselected Oryza officinalis, W0002, as a wild rice species resistant to rice blast disease,8) and isolated and identified ( - )-jasmonic acid as an antifungal substance from the leaves.