InterPro domain: IPR024171

Plant S-receptor kinase-like genes have diverse functions in cell signalling, development, stress responses and host-pathogen defence responses [ 1 ].

This entry contains receptor-like kinases, including S-locus receptor kinase (SRK). SRK is the female determinant of the self-incompatibility (SI) response in Brassica [ 2 , 3 ]. Flowering plants apply a self-incompatibility mechanism to prevent inbreeding and thereby increase genetic diversity [ 4 ]. In most flowering plants, SI systems are controlled by a single multi-allelic locus termed the S-locus. Other members of this group do not play a role in SI [ 5 ], and some members are from self-compatible plants such as Oryza sativa (Rice) and Arabidopsis thaliana (Mouse-ear cress), neither of which possess the SI response. P93068 and O23743 from Brassica oleracea (Wild cabbage), as well as O81905 from A. thaliana, are reported to possibly have overlapping roles in both defence and development [ 6 , 7 ].

The proteins in this family contain an extracellular D-mannose-binding lectin domain ( IPR001480 ), an S-locus glycoprotein family domain ( IPR000858 ), a PAN domain, and an intracellular kinase domain ( IPR000719 ).

1. Receptor kinase signaling in plant development. Annu. Rev. Cell Dev. Biol. 18, 163-92
2. Molecular cloning of a putative receptor protein kinase gene encoded at the self-incompatibility locus of Brassica oleracea. Proc. Natl. Acad. Sci. U.S.A. 88, 8816-20
3. The S receptor kinase determines self-incompatibility in Brassica stigma. Nature 403, 913-6
4. The different mechanisms of sporophytic self-incompatibility. Philos. Trans. R. Soc. Lond., B, Biol. Sci. 358, 1037-45
5. A putative receptor protein kinase gene in Ipomoea trifida. Plant Cell Physiol. 37, 681-5
6. Rapid induction by wounding and bacterial infection of an S gene family receptor-like kinase gene in Brassica oleracea. Plant Cell 9, 49-60
7. Comparison of the expression patterns of two small gene families of S gene family receptor kinase genes during the defence response in Brassica oleracea and Arabidopsis thaliana. Gene 282, 215-25