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Plant Physiology 56:167-170 (1975)
© 1975 American Society of Plant Biologists

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Inhibition of Gibberellic Acid-induced Elongation in Avena Stem Segments by a Substituted Pyrimidine 1

Michael J. Montague2

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

Avena stem segments, which respond with high amplitude, specificity, and sensitivity to gibberellic acid, were used to study the inhibition of gibberellin-induced elongation by the growth retardant {alpha}-cyclopropyl-{alpha}-(4-methoxyphenyl)-5-pyrimidine methanol (EL-531). It was found that EL-531 strongly inhibits gibberellic acid-induced elongation in this system at a concentration of 1 mM. From a double-reciprocal plot of elongation and gibberellic acid concentration, it seems that EL-531 and gibberellic acid do not compete reversibly for the same site of action. Also, because EL-531 effectively inhibits elongation in internodal tissue dissected away from the node and leaf sheath, it cannot be acting primarily by inhibiting the synthesis or transport of the leaf sheath factor(s). Because EL-531 causes lateral expansion of the stem segments as well as increased diameters of epidermal cells, in a manner very similar to the effects of colchicine, it is suggested that EL-531 inhibits gibberellic acid-induced elongation by somehow interfering with the orientation of the products of cell wall synthesis.

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

1 This work was supported by a National Science Foundation Predoctoral Fellowship and by a Horace H. Rackham Graduate Fellowship to the author. A portion of this work was submitted in partial fulfillment of the requirements for the Ph.D. at The University of Michigan.






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