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Modulation of mechanosensitive calcium‐selective cation channels by temperature
Author(s) -
Ding Jiu Ping,
Pickard Barbara G.
Publication year - 1993
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1993.03050713.x
Subject(s) - mechanosensitive channels , biophysics , biology , bursting , gating , calcium , conductance , ion channel , biochemistry , chemistry , physics , neuroscience , receptor , organic chemistry , condensed matter physics
Summary Gating of associations of mechanosensitive Ca 2+ ‐selective cation co‐channels in the plasmalemma of onion epidermis has a strong and unusual temperature dependence. Tension‐dependent activity rises steeply as temperature is lowered from 25°C to about 6°C, but drops to a low level at about 5°C. Under the conditions tested (with Mg 2+ and K + at the cytosolic face of outside‐out membrane patches), promotion results both from more bursting at all observed linkage levels and from longer duration of bursts of co‐channels linked as quadruplets and quintuplets. Co‐channel conductance decreases linearly, but only modestly, with declining temperature. It is proposed that these and related mechanosensitive channels may participate in a variety of responses to temperature, including thermonasty, thermotropism, hydrotropism, and both cold damage and cold acclimation.