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Modulation of mechanosensitive calcium-selective cation channels by temperatureGating 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 degrees C to about 6 degrees C, but drops to a low level at about 5 degrees C. Under the conditions tested (with Mg2+ 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.
Document ID
20050000475
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ding, J. P.
(Washington University Saint Louis, MO 63130-4899)
Pickard, B. G.
Date Acquired
August 22, 2013
Publication Date
May 1, 1993
Publication Information
Publication: The Plant journal : for cell and molecular biology
Volume: 3
Issue: 5
ISSN: 0960-7412
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: S07 RR077054-21
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Plant Biology

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