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Plant and Cell Physiology Advance Access first published online on January 3, 2007
This version published online on January 4, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcl065
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

AHK5 His-kinase Regulates Root Elongation Through an ETR1-Dependent Abscisic Acid and Ethylene Signaling Pathway in Arabidopsis thaliana

Ayako Iwama1, Takafumi Yamashino1,6, Yasushi Tanaka1, Hitoshi Sakakibara2, Tatsuo Kakimoto3, Shusei Sato4, Tomohiko Kato4, Satoshi Tabata4, Akira Nagatani5 and Takeshi Mizuno1

1Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-8601, Japan.
2RIKEN Plant Science Center, Suehiro 1-7-22, Tsurumi, Yokohama 230-0045, Japan.
3Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
4Kazusa DNA Research Institute, 2-6-7 Kazusa-kamatari, Kisarazu, Chiba 292-0818, Japan
5Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
6To whom correspondence should be addressed.

Corresponding author: Takafumi Yamashino, Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan. E-mail: yamasino{at}agr.nagoya-u.ac.jp, Tel: +81-52-789-4090, Fax: +81-52-789-4091


  Abstract

The Arabidopsis thaliana genome encodes a small family of histidine (His) protein kinases, some of which have redundant functions as ethylene receptors, whereas others serve as cytokinin receptors. The most poorly characterized of these is authentic histidine kinase 5 (AHK5; also known as cytokinin independent 2, CKI2). Here we characterize three independent ahk5 mutants, and show that they have a common phenotype. Our results suggest that AHK5 His-kinase acts as a negative regulator in the signaling pathway in which ethylene and abscisic acid (ABA) inhibit the root elongation through ETR1 (ethylene receptor).

Keywords: Arabidopsis thaliana - AHK5 His-kinase - Abscisic acid - Ethylene - Root elongation


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 Proc. Natl. Acad. Sci. USAHome page
L.-S. P. Tran, T. Urao, F. Qin, K. Maruyama, T. Kakimoto, K. Shinozaki, and K. Yamaguchi-Shinozaki
Functional analysis of AHK1/ATHK1 and cytokinin receptor histidine kinases in response to abscisic acid, drought, and salt stress in Arabidopsis
PNAS, December 18, 2007; 104(51): 20623 - 20628.
[Abstract] [Full Text] [PDF]


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