Interaction of Extracellular Potassium and Cesium with the Kinetics of Inward Rectifying K+ Channels in the Plasma Membrane of Mesophyll Protoplasts of Avena sativa |
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| Authors: | Kourie Joseph I |
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| Institution: | Department of Biology, Kline Biology Tower, Yale University New Haven, Connecticut 06511, U.S.A. |
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| Abstract: | Using the patch-clamp technique the kinetics of whole-cell andsingle channel inwardly rectifying K+ currents were measuredin enzymatically-isolated protoplasts from Avena sativa mesophyllleaf cells. The hyperpolarization-activated whole-cell currenthad an initial K+ component (IKI) and a time-dependent K+ componentwhich reaches steady state (IKSS) within 500 ms. After an initialdelay, the activation of IKss and the deactivation of the tailK+ current (IKT) followed an exponential time course. The time-constantsof activation ( |
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