Journal
NATURE
Volume 409, Issue 6823, Pages 1060-1063Publisher
MACMILLAN PUBLISHERS LTD
DOI: 10.1038/35059117
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Cytokinins are a class of plant hormones that are central to the regulation of cell division and differentiation in plants(1,2). It has been proposed that they are detected by a two-component system, because overexpression of the histidine kinase gene CKI1 induces typical cytokinin responses(3) and genes for a set of response regulators of two-component systems can be induced by cytokinins(4,5). Two-component systems use a histidine kinase as an environmental sensor and rely on a phosphorelay for signal transduction. They are common in microorganisms, and are also emerging as important signal detection routes in plants(6-9). Here we report the identification of a cytokinin receptor. We identified Arabidopsis cre1 (cytokinin response 1) mutants, which exhibited reduced responses to cytokinins. The mutated gene CRE1 encodes a histidine kinase. CRE1 expression conferred a cytokinin-dependent growth phenotype on a yeast mutant that lacked the endogenous histidine kinase SLN1 (ref. 10), providing direct evidence that CRE1 is a cytokinin receptor. We also provide evidence that cytokinins can activate CRE1 to initiate phosphorelay signalling.
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