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Plant Physiology 52:186-189 (1973)
© 1973 American Society of Plant Biologists

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Articles

Inactivity of 3-Methyleneoxindole as Mediator of Auxin Action on Cell Elongation 1

Michael L. Evansa and Peter M. Rayb

a Department of Botany, The Ohio State University, Columbus, Ohio 43210, Department of Biological Sciences, Stanford University, Stanford, California 94305

The recently reported growth-promoting ability of 3-methyl-eneoxindole was examined in order to test the hypothesis that indole-3-acetic acid acts as a growth promoter only after oxidative conversion to 3-methyleneoxindole. Methyleneoxindole was synthesized from indole-3-acetic acid and N-bromosuccinimide, and its identity was confirmed by ultraviolet absorption, infrared absorption, mass spectrometry, and melting point. Methyleneoxindole was found to lack growth-promoting activity in coleoptile and pea (Pisum sativum) stem segments. Chlorogenic acid, an inhibitor of the oxidation of indole-3-acetic acid, was found to have no inhibitory effect on growth promotion by indole-3-acetic acid. It is concluded that 3-methyleneoxindole is inactive as a growth promoter and therefore does not mediate the action of auxin on cell elongation.

1 This work supported by National Science Foundation Grant GB37547. Part of this work was done during the senior author's tenure as a North Atlantic Treaty Organization Postdoctoral Fellow in West Germany. Paper No. 830 from the Department of Botany, The Ohio State University, Columbus, Ohio 43210.






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