Journal Article

Expression and Ca<sup>2+</sup> Dependency of Plasma Membrane K<sup>+</sup> Channels of Tobacco Suspension Cells Adapted to Salt Stress

Naoki Kasukabe, Megumi Watanabe-Sugimoto, Ken Matsuoka, Eiji Okuma, Ichiro Obi, Yoshimasa Nakamura, Yasuaki Shimoishi, Yoshiyuki Murata and Tadaaki Kakutani

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 12, pages 1674-1677
Published in print December 2006 | ISSN: 0032-0781
Published online December 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcl030
Expression and Ca2+ Dependency of Plasma Membrane K+ Channels of Tobacco Suspension Cells Adapted to Salt Stress

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The expression of plasma membrane K+ channels of NaCl-adapted tobacco suspension cells and effects of extracellular Ca2+ on plasma membrane K+ channels were investigated. Reverse transcription–PCR (RT–PCR) analysis showed that expression of TORK1, which encodes a K+ channel, was much lower in NaCl-adapted cells than in NaCl-unadapted cells. The magnitude of the outward K+ currents of NaCl-adapted as well as NaCl-unadapted cells decreased with increasing extracellular Ca2+ but there is no significant difference in Ca2+ dependency of the K+ current. These analyses suggest that reduction of the number of K+ channels might cause NaCl adaptation of cells through the decrease of outward K+ currents.

Keywords: Extracellular Ca2+; K+ channel; Nicotiana tabacum; Plasma membrane; Salt adaptation

Journal Article.  2040 words.  Illustrated.

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

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