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Metabolism of Indole-3-acetic Acid

IV. Biological Properties of Amino Acid Conjugates ¹

^a Departments of Entomology and Biology, Pesticide Research Laboratory and Graduate Study Center, The Pennsylvania State University, University Park, Pennsylvania 16802

The biological activity of 20 L--amino acid conjugates of indole-3-acetic acid (IAA) to stimulate cell elongation of Avena sativa coleoptile sections and to stimulate growth of soybean cotyledon tissue cultures has been examined at concentrations of 10^–4 to 10^–7M. In the Avena coleoptile test, most of the amino acid conjugates stimulated elongation. Several of the conjugates stimulated as much elongation as IAA but their half-maximum concentrations tended to be higher. Some of the more active conjugates were alanine, glycine, lysine, serine, aspartic acid, cystine, cysteine, methionine, and glutamic acid.

In the soybean cotyledon tissue culture test, all of the L--amino acid conjugates of IAA stimulated growth except for the phenylalanine, histidine, and arginine conjugates. Most of the conjugates produced responses at least as great as that caused by IAA. Conjugates with half-maximum concentrations lower than IAA included cysteine, cystine, methionine, and alanine. These conjugates exceed the IAA-induced callus growth at all tested concentrations. Other conjugates significantly better than IAA at 10^–6M were serine, glycine, leucine, proline, and threonine.

³ To whom correspondence should be addressed.

¹ Authorized for publication as Paper No. 5014 in the Journal Series of the Pennsylvania Agricultural Experiment Station. Supported in part by the Northeastern Regional Research Project NE-53 and Regional Research Funds.

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