Abstract
Blackleg of canola (Brassica napus) causes economic losses worldwide. Populations of the causal agent, Leptosphaeria maculans, have a great propensity for change under selection pressure by resistance genes in commercial cultivars. The high evolutionary potential of the fungus presents challenges to plant breeders to effectively deploy durable resistance. The close taxonomic relationship between Brassica spp. and the model plant Arabidopsis thaliana is being exploited by researchers who are characterizing resistance genes against the disease and using functional genomic approaches to understand the defence responses of the host. The application of genomic technologies to both partners in the interaction is uncovering details of pathogenicity mechanism used by L. maculans, and defence responses by its host, B. napus.
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