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Plant Physiology 55:1043-1047 (1975)
© 1975 American Society of Plant Biologists

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Regulation of Cell Wall Synthesis in Avena Stem Segments by Gibberellic Acid 1

Michael J. Montague2 and Hiroshi Ikuma

a Department of Botany, University of Michigan, Ann Arbor, Michigan 48104

Gibberellic acid induces (a) increased elongation of Avena sativa stem segments, (b) increased formation of cell wall material, measured on the basis of dry weight, and (c) increased incorporation of 14C-glucose into all fractions of the cell wall material. This increased incorporation of radioactivity correlates well with increased formation of cell wall material and shows a time-course pattern similar to the time course of the elongation response. Approximately one hour after the application of gibberellic acid, the rates both of growth and of incorporation of radioactivity accelerate to about 2-fold over the control rate. Gibberellic acid does not stimulate the incorporation of labeled glucose into the cell wall material simply by increasing the rate of uptake of glucose by internodal cells. The stimulation of the incorporation of 14C-glucose into cell wall material, which reflects the stimulation of cell wall synthesis, seems to be an important and relatively early effect of gibberellic acid in this system and probably contributes significantly to the elongation response elicited by the hormone.

2 Present address: Department of Biological Sciences, Stanford University, Stanford, Calif. 94305.

1 Supported by a National Science Foundation Predoctoral Fellowship to M.J.M. Material from a dissertation submitted by M.J.M. in partial fulfillment of the requirements for the Ph.D. at The University of Michigan.






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Copyright © 1975 by the American Society of Plant Biologists