Isolated polynucleotides that encode cytokinin-sensing histidine kinase
polypeptides, and the encoded polypeptides, are described. Expression
cassettes comprising the polynucleotides of the invention and plants and
plant cells that are transformed with the polynucleotides are described.
Methods of using the cytokinin-sensing histidine kinase polypeptides and
polynucleotides to modulate histidine kinase activity and/or histidine
kinase levels in plants and plant cells are further described.