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K + Channels in the Plasma Membrane of Lily Pollen Protoplasts
Author(s) -
Obermeyer G.,
Kolb H.A.
Publication year - 1993
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1993.tb00334.x
Subject(s) - transcellular , pollen , conductance , depolarization , biophysics , pollen tube , population , membrane , patch clamp , lilium , membrane potential , protoplast , chemistry , botany , biology , physics , biochemistry , pollination , medicine , receptor , environmental health , condensed matter physics
Using the patch‐clamp technique K + channels could be observed in the plasma membrane of protoplasts from pollen grains of Lilium longiflorum . With depolarizing membrane potentials the open probability of the different K + channels increased. Two K + channel populations occurring occasionally had a single channel conductance of 120 pS and 42 pS, respectively. The most often observed K + channel had a single channel conductance of 19 pS which showed an increase of channel activity with increasing free cytoplasmic Ca 2+ concentration. This channel population might be involved in the pathway of endogenous transcellular K + currents which are activated during pollen tube tip extension.