Plant Physiol. Drug Metab Dispos
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Plant Physiology 57:817-819 (1976)
© 1976 American Society of Plant Biologists

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Articles

Additional Evidence for Separable Responses to Auxin in Soybean Hypocotyl 1

Larry N. Vanderhoefa,2, Catherine A. Stahla, Cindi A. Williamsa,3 and Kathleen A. Brinkmanna

John C. Greenfieldb,4

a Department of Botany, University of Illinois, Urbana, Illinois 61801, b School of Chemical Sciences, University of Illinois, Urbana, Illinois 61801

Additional evidence for two separable responses to auxin is presented. The average of 24 control experiments indicated lag times of 12.4 and 35.4 min, and maximum rates of 0.57 and 0.54 mm hr–1, for the first and second response, respectively. The auxin analog 4-azido-2-chlorophenoxyacetic acid increased the lag time of the second response (but not the first), resulting in the temporal separation of the two responses. Plots of elongation rates against time, taken from the literature, allowed the characterization of the two responses in monocotyls and dicotyls. Study of published rate-time elongation curves showed that the maximum rate of the first response is frequently greater than the maximum rate of the second response; however, the maximum rate of the second response has not yet been shown to exceed the maximum rate of the first response.

2 To whom reprint requests should be addressed.

3 Present address: Department of Botany, Montana State University, Missoula, Mont. 59801.

4 Present address: Laboratorium für Organische Chemie, Eidgenossische Technische Hochschule, CH-8006 Zürich, Switzerland.

1 This research was supported by grants from the National Science Foundation (GB-36586, BMS72-02496), the University of Illinois Graduate Research Board, and the Department of Health, Education and Welfare (Biomedical Sciences support grant to the University of Illinois).






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists