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Journal of Experimental Botany, Vol. 54, No. 380, pp. 157-168, January 1, 2003
© 2003 Oxford University Press

Just how complex is the Brassica S-receptor complex?

Received 4 July 2002; Accepted 12 September 2002

Benjamin P. Kemp and James Doughty1,

Department of Biology and Biochemistry, University of Bath, Bath BA2 7AY, UK

1 To whom correspondence should be addressed. Fax: +44 (0)1225 386779. E-mail: bssjd{at}bath.ac.uk

Of the plant self-incompatibility (SI) systems investigated to date, that possessed by members of the Brassicaceae is currently the best understood. Whilst the recent demonstrations of interactions between the male determinant (S-locus cysteine rich protein, SCR) and the female determinant (S-locus receptor kinase, SRK) indicate the minimal requirement for SI in Brassica, no consensus exists as to the nature of these molecules in vivo and the potential involvement of accessory molecules in establishing the active S-receptor complex. Variation between S haplotypes appears to be present in the molecular composition of the receptor complex, the regulation of downstream signalling and the requirement for accessory molecules. This review discusses what constitutes an active receptor complex and highlights potential differences between haplotypes. The role of accessory molecules, in particular SLG (S-locus glycoprotein) and low molecular weight pollen coat proteins (PCPs), in pollination are discussed, as is the link between SI and unilateral incompatibility (UI).

Key words: Brassica, interspecific incompatibility, ligand, pollination, receptor, recognition, SCR, self-incompatibility, signalling, SRK.


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