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Plant Cell Advance Online Publication
Published on April 1, 2008; 10.1105/tpc.107.057547

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Received December 14, 2007
Returned for revision February 2, 2008
Accepted March 10, 2008

The Receptor Kinase CORYNE of Arabidopsis Transmits the Stem Cell–Limiting Signal CLAVATA3 Independently of CLAVATA1

Ralf Müller 1, Andrea Bleckmann 1, and Rüdiger Simon 1*

1 Institut für Genetik, Heinrich-Heine University, D-40225 Düsseldorf, Germany

* To whom correspondence should be addressed. E-mail: ruediger.simon{at}uni-duesseldorf.de.

Stem cells in shoot and floral meristems of Arabidopsis thaliana secrete the signaling peptide CLAVATA3 (CLV3) that restricts stem cell proliferation and promotes differentiation. The CLV3 signaling pathway is proposed to comprise the receptor kinase CLV1 and the receptor-like protein CLV2. We show here that the novel receptor kinase CORYNE (CRN) and CLV2 act together, and in parallel with CLV1, to perceive the CLV3 signal. Mutations in CRN cause stem cell proliferation, similar to clv1, clv2, and clv3 mutants. CRN has additional functions during plant development, including floral organ development, that are shared with CLV2. The CRN protein lacks a distinct extracellular domain, and we propose that CRN and CLV2 interact via their transmembrane domains to establish a functional receptor.




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