Clubroot disease is outsmarting canola's genetic defenses in Canada
Gossen BD, McDonald MR, Peng G, Strelkov SE, Sedaghatkish A
Crop Improvement
If you grow anything in the cabbage family, from broccoli to kale to canola-cousin mustard greens, this soil pathogen can build up in your beds and persist for years, so crop rotation and resistant varieties matter more than people think.
Clubroot is a disease caused by a microscopic soil organism that infects canola and other cabbage-family plants, causing swollen, deformed roots that choke off water and nutrients. Farmers have controlled it for years using resistant canola varieties and long crop rotations, but the pathogen keeps evolving new strains that beat the resistance genes bred into the plants. Scientists are racing to find new sources of resistance and better ways to track which disease strains are where, so one single strategy doesn't become the weak link.
Key Findings
Clubroot-infested fields exist across Canada's full 8 million hectares of annual canola production
Virulent pathotypes are emerging and rapidly replacing established pathogen populations, eroding existing genetic resistance
Genomic analysis of resting spores shows the pathogen reproduces mainly clonally, shaped by balancing selection, aiding improved reference genome development
chevron_right Technical Summary
A soil-borne pathogen called clubroot is evolving faster than canola breeders can keep up, threatening Canada's 8 million hectares of canola with new disease strains that can overcome existing resistant varieties.
Abstract Preview
Original paper
Managing Clubroot on Canola in Canada: Advances, Challenges, and Future Directions.
Plasmodiophora brassicae, an obligate chromist pathogen that causes clubroot disease, occurs wherever brassica crops are grown. This review synthesizes recent advances in clubroot research, with an...
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