Rapid hormone-induced hyperpolarization of the oat coleoptile transmembrane potential

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...

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Published inPlant physiology (Bethesda) Vol. 59; no. 3; pp. 395 - 397
Main Authors Cleland, Robert E., Hidde B. A. Prins, James Ronald Harper, Higinbotham, Noe
Format Journal Article
LanguageEnglish
Published United States American Society of Plant Physiologists 01.03.1977
Subjects
Auxins
Barley
Coleoptiles
Electrodes
Excretion
Hormones
Membrane potential
Oats
Plants
Protons
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Summary: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.
Bibliography:F60
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ISSN:0032-0889
1532-2548
DOI:10.1104/pp.59.3.395