Abstract
A product of indole-3-acetic acid (IAA) metabolism having an auxin-like activity has been isolated from liquid cultures of Pseudomonas syringae pv. savastanoi. By spectral data and chemical correlations the compound has been identified as α- N-acetyl-indole-3-acetyl-ε- l-lysine (Ac-IAA-Lys). The IAA-derivative was detected in culture filtrates of oleander strains but not in culture filtrates of olive strains. The physiological effects of Ac-IAA-Lys on hypocotyl elongation in wheat, leaf chlorosis in oleander and bean and the hypertrophic response of potato tuber discs were compared with those of IAA. The results indicated that Ac-IAA-Lys was approximately 60 % less active than IAA.
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