Brassica juncea
The "Brassica" crops consists of combinations of 3 major ancestral genomes (A, B and C) where the most important canola crop is "Brassica napus" with an AACC genome. Most resistance traits have been introgressed into "B. napus" from wild "Brassica rapa" (AA genome) relatives. In contrast, none or very few "L. maculans" resistance traits can be found in the "Brassica oleracea" (CC genome) parental species. Additionally, some resistance traits have been introgressed from the "B" genomes from "Brassica nigra" (BB genome), "Brassica juncea" (AABB genome) or "Brassica carinata" (BBCC genome) into "B. napus". In the "Brassica"-"L. maculans" interactions, there are many race-specific resistance genes known, and some of the corresponding fungal avirulence genes have also been identified.