Journal Article

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

Ayako Iwama, Takafumi Yamashino, Yasushi Tanaka, Hitoshi Sakakibara, Tatsuo Kakimoto, Shusei Sato, Tomohiko Kato, Satoshi Tabata, Akira Nagatani and Takeshi Mizuno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 2, pages 375-380
Published in print February 2007 | ISSN: 0032-0781
Published online February 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcl065
AHK5 Histidine Kinase Regulates Root Elongation Through an ETR1-Dependent Abscisic Acid and Ethylene Signaling Pathway in Arabidopsis thaliana

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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

Journal Article.  3256 words.  Illustrated.

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

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