Effect of Light of Several Spectral Bands on the Metabolism of Radioactive IAA in Bean Seedlings

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Abstract
The metabolism of indoleacetic acid-C14 applied to Dutch brown seedlings varied with different regions of the spectrum, with less label being recovered from the red than the blue-grown plants. Besides IAA there were 3 additional labelled metabolites one of which had the same RF values as indolealdehyde in 5 solvent systems. The concentrations of this metabolite in the red-grown plants was approximately twice that found in the blue. A relationship between elongation and metabolism of radioactive indoleacetic acid in plants exposed to different wavelengths of light was apparent.