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Plant Physiol, November 2001, Vol. 127, pp. 803-816

The Arabidopsis Somatic Embryogenesis Receptor Kinase 1 Gene Is Expressed in Developing Ovules and Embryos and Enhances Embryogenic Competence in Culture1

Valérie Hecht, Jean-Philippe Vielle-Calzada,2 Marijke V. Hartog, Ed D.L. Schmidt,3 Kim Boutilier,4 Ueli Grossniklaus, and Sacco C. de Vries*

Laboratory of Molecular Biology, Wageningen University, 6703HA Wageningen, The Netherlands (V.H., M.V.H., E.D.L.S., K.B., S.C.d.V.); Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724 (J.-P.V.-C., U.G.); and Department of Plant Biology, University of Zurich, Zurich CH-8008, Switzerland (U.G.)

We report here the isolation of the Arabidopsis SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE 1 (AtSERK1) gene and we demonstrate its role during establishment of somatic embryogenesis in culture. The AtSERK1 gene is highly expressed during embryogenic cell formation in culture and during early embryogenesis. The AtSERK1 gene is first expressed in planta during megasporogenesis in the nucleus of developing ovules, in the functional megaspore, and in all cells of the embryo sac up to fertilization. After fertilization, AtSERK1 expression is seen in all cells of the developing embryo until the heart stage. After this stage, AtSERK1 expression is no longer detectable in the embryo or in any part of the developing seed. Low expression is detected in adult vascular tissue. Ectopic expression of the full-length AtSERK1 cDNA under the control of the cauliflower mosaic virus 35S promoter did not result in any altered plant phenotype. However, seedlings that overexpressed the AtSERK1 mRNA exhibited a 3- to 4-fold increase in efficiency for initiation of somatic embryogenesis. Thus, an increased AtSERK1 level is sufficient to confer embryogenic competence in culture.

1 This work was supported through a collaboration with Novartis (grant nos. PL96662282 and ERBIO4-CT96-0689 from the European Union Biotechnology program to S.C.d.V.), by Pioneer Hi-Bred International (competitive research award to U.G. and J.-P.V.-C.), and by the Swiss National Science Foundation (fellowship to J.-P.V.-C.).

2 Present address: CINVESTAV-Irapuato, Departimento de Ingeniería Genética, Irapuato, México.

3 Present address: GeneTwister, P.O. Box 193, 6700AD Wageningen, The Netherlands.

4 Present address: Plant Research International, P.O. Box 16, 6700AA Wageningen, The Netherlands.

* Corresponding author; e-mail sacco.devries{at}mac.mb.wau.nl; fax 31-317-483584.

© 2001 American Society of Plant Physiologists


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