Developing Canola Germplasms with Diverse Mechanisms to Enhance the Durability of Clubroot Resistance

Researcher: Gary Peng and Fengqun Yu, Agriculture and Agri-Food Canada, Saskatoon SK

Project Code: SCDC 2014-0217

Final Report: April 2018

Summary: Cultivar resistance is considered the most effective and practical approach for clubroot
management. However, current resistant canola cultivars, available in Canada since 2009, were based on a single clubroot resistance (CR) gene. In 2013, some fields in Alberta with a resistant canola cultivar showed substantial levels of clubroot damage, with further testing showing that the pathogen strains from fields were virulent to each of the clubroot resistant cultivars in the marketplace, including a new pathotype 5x. In 2014, researchers initiated a four-year project to assess if any of the previously identified CR genes would show efficacy against pathotype 5x of P. brassica, to explore advanced technologies for better understanding CR mechanisms and to develop more diverse CR germplasm for sustainable clubroot resistance. As a result of the project,researchers have successfully developed a range of new and improved canola germplasms carrying single/multi CR genes against the new strain of P. brassicae pathotypes 5x.

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