The AHK4 Gene Involved in the Cytokinin-Signaling Pathway as a Direct Receptor Molecule in Arabidopsis thaliana | Zendy

Chiharu Ueguchi | Zendy; Shusei Sato | Zendy; Tomohiko Kato | Zendy; Satoshi Tabata | Zendy

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The AHK4 Gene Involved in the Cytokinin-Signaling Pathway as a Direct Receptor Molecule in Arabidopsis thaliana

Author(s) -

Chiharu Ueguchi,

Shusei Sato,

Tomohiko Kato,

Satoshi Tabata

Publication year - 2001

Publication title -

plant and cell physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.975

H-Index - 152

eISSN - 1471-9053

pISSN - 0032-0781

DOI - 10.1093/pcp/pce094

Subject(s) - cytokinin , arabidopsis , arabidopsis thaliana , histidine kinase , mutant , biology , gene , microbiology and biotechnology , signal transduction , kinase , genetics , auxin

We previously identified a set of structurally related genes, AHK2, 3 and 4, each encoding a sensor histidine kinase in Arabidopsis thaliana. To determine the relevant biological functions, we identified a loss-of-function mutation of the AHK4 gene. The mutant exhibited the cytokinin-resistant phenotype not only in inhibition of root growth by cytokinin but also in greening and shoot induction of calli. Moreover, AHK4 expressed in budding yeast showed histidine kinase activity in a manner dependent on the presence of cytokinin. These results strongly suggested that AHK4 is involved in the cytokinin-signaling pathway, as a direct receptor molecule, in Arabidopsis.

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