New plant growth promoters, repraesentins a, b and c, from lactarius repraesentaneus

Abstract

Three new plant growth regulatory sesquiterpenoids were isolated from the Lactarius repraesentaneus fungus. Their structures were elucidated to be a protoilludene sesquiterpene, namely repraesentin A (1), and two related sesquiterpenes, namely repraesentins B (2) and C (3). Compounds 1-3 showed promotion activities toward the radicle elongation of lettuce seedlings by 136%, 118% and 184% at 67 ppm, respectively. © 2003 by Japan Society for Bioscience, Biotechnology, and Agrochemistry.