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Plant Physiology 61:68-71 (1978)
© 1978 American Society of Plant Biologists

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Articles

Inactivity of Oxidation Products of Indole-3-acetic Acid on Ethylene Production in Mung Bean Hypocotyls 1

Oi-lim Lau2, William W. John3 and S. F. Yang

Department of Vegetable Crops, University of California, Davis, California 95616

The suggestion that indole-3-acetic acid (IAA)-stimulated ethylene production is associated with oxidative degradation of IAA and is mediated by 3-methyleneoxindole (MOI) has been tested in mung bean (Phaseolus aureus Roxb.) hypocotyl segments. While IAA actively stimulated ethylene production, MOI and indole-3-aldehyde, the major products of IAA oxidation, were inactive. Tissues treated with a mixture of intermediates of IAA oxidation, obtained from a 1-hour incubation of IAA with peroxidase, failed to stimulate ethylene production. Furthermore, chlorogenic acid and p-coumaric acid, which are known to interfere with the enzymic oxidation of IAA to MOI, had no effect on IAA-stimulated ethylene production. Other oxidation products of IAA, including oxindole-3-acetic acid, indole-3-carboxylic acid, (2-sulfoindole)-3-acetic acid, and dioxindole-3-acetic acid, were all inactive. 1-Naphthaleneacetic acid was as active as IAA in stimulating ethylene production but was decarboxylated at a much lower rate than IAA, suggesting that oxidative decarboxylation of auxins is not linked to ethylene production. These results demonstrate that IAA-stimulated ethylene production in mung bean hypocotyl tissue is not mediated by MOI or other associated oxidative products of IAA.

2 Present address: Pomology Section, Canada Department of Agriculture, Summerland, B.C. VOH 1ZO, Canada.

3 Present address: Mobil Chemical Company, P.O. Box 240, Edison, N.J. 08817

1 This work was supported by National Science Foundation Grant PCM 75-14444






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1978 by the American Society of Plant Biologists