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Plant and Cell Physiology Advance Access originally published online on November 2, 2006
Plant and Cell Physiology 2006 47(12):1674-1677; doi:10.1093/pcp/pcl030
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Expression and Ca2+ Dependency of Plasma Membrane K+ Channels of Tobacco Suspension Cells Adapted to Salt Stress

Naoki Kasukabe1, Megumi Watanabe-Sugimoto2, Ken Matsuoka3,5, Eiji Okuma1, Ichiro Obi4, Yoshimasa Nakamura1, Yasuaki Shimoishi1, Yoshiyuki Murata1,* and Tadaaki Kakutani4

1 Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama, 700-8530 Japan
2 Department of Agriculture, Okayama University, 1-1-1 Tsushima-naka, Okayama, 700-8530 Japan
3 RIKEN Yokohama Institute, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama City, Kanagawa, 230-0045 Japan
4 Division of Applied Life Science, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502 Japan

* Corresponding author: E-mail, muta{at}cc.okayama-u.ac.jp; Fax, +81-86-251-8310.


  Abstract

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

5 Present address: Laboratory of Plant Nutrition, Faculty of Agriculture, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka, 812-8581 Japan.

(Received September 15, 2006; Accepted October 23, 2006)
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