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Plant Cell Advance Online Publication
Published on November 11, 2005; 10.1105/tpc.105.036814

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Received August 4, 2005
Returned for revision October 5, 2005
Accepted October 18, 2005

The Arabidopsis thaliana SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASES1 and 2 Control Male Sporogenesis

Catherine Albrecht 1, Eugenia Russinova 1, Valerie Hecht 2, Erik Baaijens 1, and Sacco de Vries 1*

1 Laboratory of Biochemistry, Department of Agrotechnology and Food Sciences, Wageningen University and Research Centre, 6703 HA Wageningen, The Netherlands
2 School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia

* To whom correspondence should be addressed. E-mail: sacco.devries{at}wur.nl.

The Arabidopsis thaliana SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE (SERK) family of plasma membrane receptors consists of five closely related members. The SERK1 and SERK2 genes show a complex expression pattern throughout development. Both are expressed in anther primordia up to the second parietal division. After this point, expression ceases in the sporocytes and is continued in the tapetum and middle layer precursors. Single knockout mutants of SERK1 and SERK2 show no obvious phenotypes. Double mutants of SERK1 and SERK2 are completely male sterile due to a failure in tapetum specification. Fertility can be restored by a single copy of either gene. The SERK1 and SERK2 proteins can form homodimers or heterodimers in vivo, suggesting they are interchangeable in the SERK1/SERK2 signaling complex.






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