Journal
PLANT AND CELL PHYSIOLOGY
Volume 48, Issue 2, Pages 375-380Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcl065
Keywords
abscisic acid; AHK5 His-kinase; Arabidopsis thaliana; ethylene; root elongation
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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).
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