Plant Physiol.
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Plant Physiology 58:77-81 (1976)
© 1976 American Society of Plant Biologists

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Articles

Metabolism of Indole-3-Acetic Acid

II. Oxindole Pathway in Parthenocissus tricuspidata Crown-Gall Tissue Cultures 1

Robert H. Hamilton, Harold E. Meyer, Robert E. Burke, Chao S. Feung and Ralph O. Mumma

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

An indoleacetic acid oxidase preparation from an acetone powder of Parthenocissus tricuspidata crown-gall tissue has been examined. An intermediate in the reaction is 3-hydroxymethyloxindole and nonenzymic conversion of it to 3-methyleneoxindole was observed. Neither reaction mixtures nor 3-methyleneoxindole have any auxin-like activity in Avena or wheat coleoptile bioassays. In vivo studies show that although 53% decarboxylation of indoleacetic acid was observed in 48 hours, only a small amount of 3-methyloxindole could be recovered from the medium. The other decarboxylated products remain to be identified but are not 3-hydroxymethyloxindole or 3-methyleneoxindole.

1 Contribution No. 112 from the Department of Biology and Journal Series Article No. 4670 from The Pennsylvania Agricultural Experiment Station.






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