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Science 19 March 1999:
Vol. 283. no. 5409, pp. 1911 - 1914
DOI: 10.1126/science.283.5409.1911
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Reports

Signaling of Cell Fate Decisions by CLAVATA3 in Arabidopsis Shoot Meristems

Jennifer C. Fletcher, 1 Ulrike Brand, 2 Mark P. Running, 1* Rüdiger Simon, 2 Elliot M. Meyerowitz 1dagger

In higher plants, organogenesis occurs continuously from self-renewing apical meristems. Arabidopsis thaliana plants with loss-of-function mutations in the CLAVATA (CLV1, 2, and 3) genes have enlarged meristems and generate extra floral organs. Genetic analysis indicates that CLV1, which encodes a receptor kinase, acts with CLV3 to control the balance between meristem cell proliferation and differentiation. CLV3 encodes a small, predicted extracellular protein. CLV3 acts nonautonomously in meristems and is expressed at the meristem surface overlying the CLV1 domain. These proteins may act as a ligand-receptor pair in a signal transduction pathway, coordinating growth between adjacent meristematic regions.

1 California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA.
2 Institut für Entwicklungsbiologie, Universität zu Köln, Gyrhofstrasse 17, 50923 Köln, Germany.
*   Present address: University of California Berkeley, U.S. Department of Agriculture-Agricultural Research Service Plant Gene Expression Center, 800 Buchanan Street, Albany, CA 94710, USA.

dagger    To whom correspondence should be addressed at Division of Biology 156-29, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA. E-mail: meyerow{at}cco.caltech.edu

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D. Reinhardt, M. Frenz, T. Mandel, and C. Kuhlemeier (2003)
Development 130, 4073-4083
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Modes of intercellular transcription factor movement in the Arabidopsis apex.
X. Wu, J. R. Dinneny, K. M. Crawford, Y. Rhee, V. Citovsky, P. C. Zambryski, and D. Weigel (2003)
Development 130, 3735-3745
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An Arabidopsis MADS-Box Protein, AGL24, is Specifically Bound to and Phosphorylated by Meristematic Receptor-Like Kinase (MRLK).
H. Fujita, M. Takemura, E. Tani, K. Nemoto, A. Yokota, and T. Kohchi (2003)
Plant Cell Physiol. 44, 735-742
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Science. ISSN 0036-8075 (print), 1095-9203 (online)