Novel Phytoalexins (Oryzalexins A, B and C) Isolated from Rice Blast Leaves Infected with Pyricularia oryzae. Part II: Structural Studies of Oryzalexins

Abstract

Oryzalexins A, B and C, isolated from rice leaves infected with P. oryzae as a group of novel phytoalexins, were confirmed to be (+)-sandaracopimaradiene derivatives by chemical and spectroscopic studies, i. e. A: 3-oxy-7-oxo-(I); B: 3-oxo-7-oxy-(II) and C: 3, 7-dioxo-(+)-sandaracopimaradiene (III). © 1985, Japan Society for Bioscience, Biotechnology, and Agrochemistry. All rights reserved.