Researchers successfully transferred both clubroot and blackleg resistance into Brassica napus canola breeding lines from a unique black mustard (B. nigra) line.
Canola with genetic resistance remains the most important management strategy for blackleg and clubroot, however virulent pathogen populations have recently been reported that are able to overcome the resistance of canola cultivars for both diseases. In this four-year study, researchers studied black mustard (B. nigra), which is highly resistant to canola diseases, to identify unique and novel sources of clubroot and blackleg resistance genes and transfer those genes into B. napus breeding lines.
Researchers identified and genetically mapped a novel clubroot resistance gene highly resistant to pathotypes 3 and 5X, and other new pathotypes. They then successfully transferred this resistance into the B. napus (BC4) from the B. nigra. For blackleg, BC4 populations with resistance to two highly aggressive isolates collected in the Prairies were developed. The molecular markers and the new B. napus breeding lines will be made available to canola breeders for new cultivar development.