AHK5 histidine kinase regulates root elongation through an ETR1-dependent abscisic acid and ethylene signaling pathway in Arabidopsis thaliana

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

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)375-380
Number of pages6
JournalPlant and Cell Physiology
Volume48
Issue number2
DOIs
Publication statusPublished - 2007 Feb
Externally publishedYes

Keywords

  • AHK5 His-kinase
  • Abscisic acid
  • Arabidopsis thaliana
  • Ethylene
  • Root elongation

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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