Plant Physiol. Drug Metab Dispos
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Plant Physiology 70:283-286 (1982)
© 1982 American Society of Plant Biologists

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Metabolism of Exogenous Indoleacetic Acid to Its Amide Conjugates in Cucumis sativus L. 1,2

William K. Purves and Stanley M. Hollenberg

Department of Biology, Harvey Mudd College, Claremont, California 91711

Incubation of hypocotyl segments of light-grown Cucumis sativus L. in 0.1 millimolar 3-indoleacetic acid for 16 hours led to the formation of indoleacetylaspartate and indoleacetylglutamate. There was no evidence for the formation of other conjugates of 3-indoleacetic acid with individual amino acids during the period from 4 to 48 hours of incubation. Indoleacetylglutamate reached its maximum concentration after about 4 hours of incubation and indoleacetylaspartate after about 8 hours. These levels remained unchanged for at least 40 hours. Indoleacetylaspartate caused small increases in cucumber hypocotyl segment growth at high concentrations, 1 millimolar being more effective than 0.1 millimolar.

1 Dedicated to the memory of William Sermolino Hillman: friend, scientist, and poet.

2 Supported by National Science Foundation Grant PCM-7726476 (to W. K. P.).






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Copyright © 1982 by the American Society of Plant Biologists