Genetics, Vol. 159, 811-822, October 2001, Copyright © 2001

Intrahaplotype Polymorphism at the Brassica S Locus

Christine Miegea, Véronique Ruffio-Châbleb, Mikkel H. Schierupc, Didier Cabrillaca, Christian Dumasa, Thierry Gaudea, and J. Mark Cocka
a Reproduction et Développement des Plantes, UMR 5667 CNRS-INRA-ENSL, Ecole Normale Supérieure de Lyon, 69364 Lyon, France,
b UMR Amélioration des Plantes et Biotechnologies Végétales, Institut National de la Recherche Agronomique, 35650 Le Rheu, France
c Department of Ecology and Genetics, University of Aarhus, DK-8000 Aarhus C, Denmark

Corresponding author: J. Mark Cock, Reproduction et Développement des Plantes, UMR 5667 CNRS-INRA-ENSL, Ecole Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07, France., mark.cock{at}ens-lyon.fr (E-mail)

Communicating editor: D. CHARLESWORTH

The S locus receptor kinase and the S locus glycoproteins are encoded by genes located at the S locus, which controls the self-incompatibility response in Brassica. In class II self-incompatibility haplotypes, S locus glycoproteins can be encoded by two different genes, SLGA and SLGB. In this study, we analyzed the sequences of these genes in several independently isolated plants, all of which carry the same S haplotype (S2). Two groups of S2 haplotypes could be distinguished depending on whether SRK was associated with SLGA or SLGB. Surprisingly, SRK alleles from the two groups could be distinguished at the sequence level, suggesting that recombination rarely occurs between haplotypes of the two groups. An analysis of the distribution of polymorphisms along the S domain of SRK showed that hypervariable domains I and II tend to be conserved within haplotypes but to be highly variable between haplotypes. This is consistent with these domains playing a role in the determination of haplotype specificity.




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