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Plant Cell, Vol. 11, 971-986, May 1999, Copyright © 1999, American Society of Plant Physiologists
The S15 Self-Incompatibility Haplotype in Brassica oleracea Includes Three S Gene Family Members Expressed in Stigmas
Didier Cabrillaca,
Valérie Delormea,
Jerome Garinb,
Véronique Ruffio-Châblec,
Jean-Loïc Girantona,
Christian Dumasa,
Thierry Gaudea, and
J. Mark Cocka
a Reproduction et Développement des Plantes, UMR 9938 CNRS-INRA-ENSL, École Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07, France
b CEA/Grenoble, Laboratoire de Chimie des Protéines, 17 rue des Martyrs, 38054 Grenoble Cedex, France
c Amélioration des Plantes, Institut National de la Recherche AgronomiqueDomaine de la Motte, BP29, 35650 Le Rheu Cedex, France
Correspondence to:
J. Mark Cock, Mark.Cock{at}ens-lyon.fr (E-mail), 33-4-72-72-86-00 (fax)
Self-incompatibility in Brassica is controlled by a single, highly polymorphic locus that extends over several hundred kilobases and includes several expressed genes. Two stigma proteins, the S locus receptor kinase (SRK) and the S locus glycoprotein (SLG), are encoded by genes located at the S locus and are thought to be involved in the recognition of self-pollen by the stigma. We report here that two different SLG genes, SLGA and SLGB, are located at the S locus in the class II, pollen-recessive S15 haplotype. Both genes are interrupted by a single intron; however, SLGA encodes both soluble and membrane-anchored forms of SLG, whereas SLGB encodes only soluble SLG proteins. Thus, including SRK, the S locus in the S15 haplotype contains at least three members of the S gene family. The protein products of these three genes have been characterized, and each SLG glycoform was assigned to an SLG gene. Evidence is presented that the S2 and S5 haplotypes carry only one or the other of the SLG genes, indicating either that they are redundant or that they are not required for the self-incompatibility response.
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