Abstract
THE principal auxin in higher plants is generally believed to be indoleacetic acid, which is supposed to arise from tryptophane (a) via indoleiminoacetic acid, indolepyruvic acid and indole acetaldehyde, or (b) via tryptamine and indole acetaldehyde1. The general occurrence of tryptophane in the plant kingdom is well established. Indoleacetic acid has been isolated from seeds; White2 found tryptamine in Acacia; and there is considerable indirect evidence for the occurrence of indole acetaldehyde in pea, pineapple and potato. Synthetic indolepyruvic acid and tryptamine can be converted to indoleacetic acid by certain living plant tissues and enzyme preparations made from them; but the actual function of either of these substances as an intermediary in the biosynthesis of indoleacetic acid from tryptophane has not been proved.
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