Synthesis of Indoleacetic Acid via Tryptamine by a Cell-free System from Tobacco Terminal Buds

Abstract

The content of 3-IAA Increases 100-fold In tobacco plants infected with Pseudomonas solanacearum. The host probably contributes most of the auxin during early stages of pathogenesis. The recovery of radioactive IAA from unlnfected tobacco plants fed 14C-tryptamlne (TNHo) suggests that this compound was a possible precursor of IAA synthesis. IAA synthesis probably proceeds from tryptophan by TNH2 deaminatlon.