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Regulation of Root Growth by Auxin-Ethylene Interaction ¹

^a Program in Cellular and Molecular Biology, University of Miami School of Medicine, Miami, Florida 33136

A large portion of indoleacetic acid (IAA)-induced inhibition of excised root tips and virtually all such inhibition of intact roots are the result of IAA-dependent ethylene production. Under certain conditions an additional effect of IAA accounts for a small portion of the inhibition of excised root tips. Ethylene production in response to applied IAA is governed by the level of applied auxin found inside the root. Evidence is presented to confirm the participation of ethylene in the geotropic response of roots.

¹ This investigation was supported by Research Grant B8-1431-R from the National Science Foundation and was carried out while S. P. Burg was the recipient of Career Research Development Award 5-K3-GM-6871. A. V. Chadwick was supported in part by Predoctoral Fellowship 1-F1-GM-33614 from the United States Public Health Service and also by National Institutes of Health Training Grant T01 GM 649-06.

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