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JXB Advance Access originally published online on July 13, 2007
Journal of Experimental Botany 2007 58(11):2887-2896; doi:10.1093/jxb/erm103
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© 2007 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

The SERK1 gene is expressed in procambium and immature vascular cells

Mark A. C. J. Kwaaitaal * and Sacco C. de Vries

Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, the Netherlands

The SOMATIC EMBRYOGENESIS RECEPTOR KINASE 1 (SERK1) gene is expressed in the procambium of the vascular bundles in roots, hypocotyls, and inflorescence stems. In younger parts of roots and hypocotyls, SERK1 expression was less restricted and was also observed in protoxylem cells, immature metaxylem cells and phloem companion cells. In roots, SERK1 expression was first detected in root vascular stem cells and was notably absent from the QC. In general, the SERK1 protein level as visualized by expression of a SERK1-YFP fusion protein closely followed the pattern of gene expression. In hypocotyls, prolonged application of 2,4-D resulted in extensive unorganized proliferation of SERK1 expressing cells originating from the procambium and pericycle. In roots, 2,4-D treatment results in an increase in SERK1 transcription that results in a moderate increase in the amount of SERK1-YFP fusion protein. The restricted vascular pattern of SERK1 expression in roots remains unaffected after 2,4-D treatment.

Key words: 2,4-D, procambium, SERK1, somatic embryogenesis, stem cells, transit amplifying (TA) cells, vascular tissue

* Present address and to whom correspondence should be sent: Max Planck Institute for Plant Breeding, Carl-von-Linne-weg 10, D-50829 Cologne, Germany. E-mail: markkw{at}mpiz-koeln.mpg.de

Received 5 December 2006; Revised 10 March 2007 Accepted 17 April 2007


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