Blackleg Resistance Stewardship: Improving Our Management of Host Resistance
Researcher: Dilantha Fernando, Department of Plant Science, University of Manitoba, Winnipeg, MB, Gary Peng, Agriculture and Agri-Food Canada (AAFC), Saskatoon Research Centre, SK
Project Code: CARP 2011-02
Final Report: April 2015
Summary: Genetic resistance to blackleg in canola varieties has been widely used in disease
control. However, breakdown of host genetic resistance due to population shifts and
the emergence of new races of the pathogen is a growing concern. A study was conducted across western Canada to understand the structure of fungal populations in the field and host resistance carried by the canola varieties. Overall, the findings showed that the L. maculans population is diverse and consists of dozens of races. As well, although Canadian canola varieties carry resistance genes, most of them carry the same gene, Rlm3, which is not effective any more in most canola growing regions in Western Canada. Therefore, in future blackleg resistance breeding programs, using multiple sources of Rlm genes with the combination of APR will be a better choice.
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