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Relationship between gene copies g−1 soil (determined by real-time qPCR) and harvested yield (kg, 9% water content) at the four trial sites (Tomelilla, Simrishamn, Kumla and Hallsberg) in 2018 of: (a) the susceptible Cultivar mix and (b) the clubroot-resistant cultivars cv. Mentor (blue), cv. Alister (yellow) and cv. Archimedes (red). Note: log scale on x-axis.
