Journal Article

Ca<sup>2+</sup> Regulation of Outward Rectifying K<sup>+</sup> Channel in the Plasma Membrane of Tobacco Cultured Cells in Suspension: a Role of the K <sup>+</sup>Channel in Mitigation of Salt-Stress Effects by External Ca<sup>2+</sup>

Yoshiyuki Murata, Manabu Yoshihashi, Ichiro Obi and Tadaaki Kakutani

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 10, pages 1039-1044
Published in print October 1998 | ISSN: 0032-0781
Published online October 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029300
Ca2+ Regulation of Outward Rectifying K+ Channel in the Plasma Membrane of Tobacco Cultured Cells in Suspension: a Role of the K +Channel in Mitigation of Salt-Stress Effects by External Ca2+

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The patch-clamp technique was used to study effect of the Ca2+ on K+ channels in the plasma membrane of protoplasts isolated from tobacco (Nicotiana tabacum L., cv. Bright Yellow) cultured cells in suspension. The outward rectifying whole-cell K+ currents were not affected by in-tracellular Ca2+, but they were reduced with increasing extracellular Ca2+. Neither extracellular nor intracellular Ca2+ affected the permeability ratios (pK+/PNa+) of the plasma membrane. These results suggest that the inhibition of outward-rectifying K+ channels by extracellular Ca2+may partially contribute towards the mitigation of detrimental effects of salinity on growth by extracellular Ca2+.

Keywords: Ca2+ mitigation of salt stress; Nicotiana tabacum L.; Outward rectifying K+ channel; Patch clamp; Plasma membrane

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Subjects: Plant Sciences and Forestry ; Biochemistry ; Molecular and Cell Biology

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