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Rapid Hormone-induced Hyperpolarization of the Oat Coleoptile Transmembrane Potential ¹

^a Department of Botany, Washington State University, Pullman, Washington 99163

The effects of the plant growth substances indoleacetic acid (IAA) and fusicoccin on the transmembrane potential of Avena coleoptile cells (at 27-29 C) were studied. Fusicoccin caused hyperpolarization of the membrane potential which started after a lag of less than 20 seconds, and which on average reached –49 mv at an external K⁺ concentration of 1 mM and –75 mv at 0.1 mM K⁺. IAA caused a hyperpolarization of –25 mv starting after a lag of 7 to 8 minutes. These results suggest that fusicoccin and IAA both activate electrogenic H⁺ extrusion.

³ Permanent address: Department Plant Physiology, Biol. Centre. University of Groningen. Kerklaan 30. Haren (Gr.) The Netherlands.

¹ This research was supported by United States Energy Research and Development Administration Contract AT(45-1)-2225-T19 to R. E. C. and National Science Foundation Grant BMS 74-18627 to N. H. H. B. A. P. was supported by a grant from the Dutch Organization for the Advancement of Pure Scientific Research (Z. W. O.) for his stay at Washington State University.

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