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Transient outward K+currents across the plasma membrane of laticifer fromHevea brasiliensis

Authors
Journal
FEBS Letters
0014-5793
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
458
Issue
2
Identifiers
DOI: 10.1016/s0014-5793(99)01151-5
Keywords
  • Current Inactivation
  • K+Channel
  • Laticifer
  • Hevea Brasiliensis

Abstract

Abstract 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.

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