Identification and genetic mapping of Brassica napus for resistance to pathotype 5X of Plasmodiophora brassicae

Researcher: Fengqun Yu, Gary Peng, Bruce Gossen, Agriculture and Agri-Food Canada, Saskatoon SK, Stephen Strelkov, University of Alberta, and Sheau-Fang Hwang, Alberta Agriculture and Rural Development

Project Code: CARP CCC 2015-6 Yu

Final Report: May 2018

Summary: Although clubroot resistant (CR) hybrids are available in Canada, the recent emergence of new pathotypes such as 5X and the erosion of CR in the Canadian resistant hybrids is of concern. The most efficient way to develop canola resistant to 5X is to identify resistance in the species and then transfer resistance into elite canola breeding lines by intraspecific crosses. In a three-year project, researchers identified more than ten B. napus lines highly resistant to pathotype 5X, and five to pathotypes 3A, 2B, 3D and 5X through screening 845 B. napus lines collected worldwide. Two new genetic regions of resistance associated with resistance to pathotype 5X were identified through genome-wide association mapping of resistance to clubroot. One of the best resistant lines has been distributed to canola seed companies.

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