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Rapid Growth Inhibition of Avena Coleoptile Segments by Abscisic Acid ¹

^a Department of Botany, Ohio State University, Columbus, Ohio 43210

An angular position sensing transducer was used to make continuous measurements of elongation of a column of Avena sativa coleoptile segments. Elongation stimulated by 2 µM indoleacetic acid was inhibited by 0.1 mM abscisic acid with a latent period of about 4 or 5 minutes at pH 6.0, 30 C. Full growth inhibition was not established until about 1 hour after the addition of the abscisic acid. The same degree of final growth inhibition could be obtained under the above conditions using 10 µM and 1 µM abscisic acid, but the latent period was longer. Pretreatments with abscisic acid affected the growth rate but did not extend the latent period of a subsequent response to auxin. The short term kinetics of inhibition by abscisic acid were not similar to those of any of the inhibitors of RNA and protein synthesis tested in this system.

¹ Paper No. 819 from the Department of Botany, Ohio State University.