Indole-3-acetic acid Metabolism in Pea Seedings1

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Abstract
Etiolated pea plants, grown aseptically, were treated with either ring- or carboxyl-labelled indole-3-acetic acid (IAA), and subsequently the carbon dioxide which had been released, the residual culture solution, and the dissected plant parts were examined for radioactive compounds. Although some breakdown of IAA was detected in the absence of plants, much more decarboxylation occurred when they were present. The only metabolite found in any quantity in vivo was IAA-aspartate. Very small amounts of indole-3-aldehyde, and of other substances identified only tentatively, were also observed. A further substance, possibly N-hydroxy indole-3-acetic acid, was found in the seedlings as well as in the culture medium; its presence in vivo is unlikely to have any metabolic significance. The paucity of products in the seedlings suggests that rapid breakdown of IAA does not occur in vivo.

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