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SUMMARY  In plants, race‐specific defence against microbial pathogens is facilitated by resistance ( R ) genes which correspond to specific pathogen avirulence genes. This study reports the cloning of a blackleg  R  gene from  Brassica napus  (canola),  Rlm9 , which encodes a wall‐associated kinase‐like (WAKL) protein, a newly discovered class of race‐specific plant RLK resistance genes.  Rlm9  provides race‐specific resistance against isolates of  Leptosphaeria maculans  carrying the corresponding avirulence gene  AvrLm5‐9 , representing only the second WAKL‐type  R  gene described to date. The Rlm9 protein is predicted to be cell membrane‐bound and while not conclusive, our work did not indicate direct interaction with AvrLm5‐9. Rlm9 forms part of a distinct evolutionary family of RLK proteins in  B. napus,  and while little is yet known about WAKL function, the  Brassica – Leptosphaeria  pathosystem may prove to be a model system by which the mechanism of fungal avirulence protein recognition by WAKL‐type  R  genes can be determined.

The Brassica napus wall‐associated kinase‐like (WAKL) gene Rlm9 provides race‐specific blackleg resistance