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Transient outward K + currents across the plasma membrane of laticifer from Hevea brasiliensis
Author(s) -
Bouteau François,
Dellis Olivier,
Rona Jean Pierre
Publication year - 1999
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(99)01151-5
Subject(s) - hevea brasiliensis , biophysics , patch clamp , potassium channel , voltage clamp , shaker , ion channel , biology , chemistry , membrane potential , electrophysiology , biochemistry , physics , natural rubber , receptor , organic chemistry , quantum mechanics , neuroscience , vibration
Non‐inactivating outward rectifying K + channel currents have been identified in a variety of plant cell types and species. The present study of laticifer protoplasts from Hevea brasiliensis , cells which are specialized for stress response, has revealed, through a switch‐clamp method, an outward rectifying current displaying rapid inactivation. The inactivation depended on the external K + concentration and on the voltage. This current inactivation appeared clearly different from all those previously described in plant cells and it shared homology with current kinetics of animal Shaker family channels. These results, given the recent cloning of plant K + channel β‐subunits, shed new light on possible plant K + channel regulation.