Fig. 2

SNP-index and Δ(SNP-index) graphs from the QTL-seq analysis. SNP-indices of a D-pool and b T-pool; c Δ(SNP-index). The x-axes represent the B. napus chromosomes and the y-axes represent the SNP-index (a, b) or Δ(SNP-index) (c). The SNP-index and Δ(SNP-index) calculations are based on the descriptions in the “Methods”. The genomic region (17.00–27.30 Mb) on chromosome C9 had an average Δ(SNP-index) of 0.60 and is regarded as the candidate QTL, with a 95% significance level (P < 0.05)