Fig. 1
From: Mapping of a novel clubroot resistance QTL using ddRAD-seq in Chinese cabbage (Brassica rapa L.)
Clubroot disease-infected and non-infected roots at 45 days after sowing and 35 days after infection. A disease index (DI) score on a scale from 0 to 4 shows the severity of infection in 348 F2 lines. DI 0 represents no infection. DI from 1 to 4 represents clubroot infection with gradually increasing disease severity. Red circles highlight the infected region