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Plant and Cell Physiology Advance Access originally published online on January 3, 2007
Plant and Cell Physiology 2007 48(2):375-380; 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

Short Communication

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

Ayako Iwama1, Takafumi Yamashino1,*, 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

*Corresponding author: E-mail, yamasino{at}agr.nagoya-u.ac.jp; 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 ABA inhibit the root elongation through ETR1 (an ethylene receptor).

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

Abbreviations: ACC, 1-aminocyclopropane-1-carboxylic acid; AHK, authentic histidine kinase; AHP, authentic histidine-containing phosphotransmitter; ARR, authentic response regulator; CRE1, cytokinin response 1; EIN, ethylene insensitive; RT–PCR, reverse transcription–PCR

(Received October 31, 2006; Accepted December 26, 2006)
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