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Articles

Effect of Gibberellic Acid on the Plasticity and Elasticity of Avena Stem Segments ¹

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

Extensibility characteristics of Avena stem segments treated with gibberellic acid (GA) were investigated in living internodes using a microgrowth method and in partially extracted cell walls subjected to Instron extensometer analysis. Both techniques showed that treatment with GA greatly increases internodal plasticity, but has virtually no effect on internodal elasticity. The increase in plasticity occurred 1 to 2 hours after the initiation of hormone treatment, which is similar to the time of onset of GA-enhanced growth and cell wall synthesis. Cycloheximide was shown to inhibit the effect of GA on plasticity.

³ Present address: Monsanto Chemical Company, St. Louis, Mo.

⁴ Present address: Department of Botany, University of Washington, Seattle, Wash. 98195.

⁵ Department of Botany, San Diego State University, San Diego, Calif. 92115.

⁶ To whom requests for reprints should be addressed.

¹ This research was supported in part by National Science Foundation Grant GB 39585 to D.L.R., grants from the American Cancer Society and the National Science Foundation to P.B.K., and the Atomic Energy Commission to Peter Albersheim.

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