Characterization of indol-3-ylacetic acid in developing secondary xylem of 26 Canadian species by combined gas chromatography – mass spectrometry

Using one purification procedure, endogenous indol-3-ylacetic acid (IAA), a known regulator of vascular development in woody plants, was characterized by capillary gas chromatography–mass spectrometry in developing secondary xylem of 6 conifers, 16 hardwoods, and 4 additional species of woody plants indigenous to the northern temperate zone. The results suggest IAA may be ubiquitous throughout the Tracheophyta.