Fig. 4

Epistatic interactions between QTL Qstb2B_1 and Qstb5B (Panel A), and between Qstb2B_2 and Qstb5B (Panel B). Box plots illustrate the significant effects of allele variants on pycnidia AUDPC on seedlings inoculated with the IPO91004 and the IPO95052 isolates. “R” and “S” denote the resistant and the susceptible alleles at each locus, respectively. The first allele refers to the SNP markers linked to Qstb2B_1 or Qstb2B_2, however the second allele refers to the Qstb5B SNP marker. Number of genotypes and mean values of Pycnidia AUDPC are indicated under each allele classes. The black horizontal lines in the middle of the boxes are the median values for the Pycnidia AUDPC value in the respective allele classes. The vertical size of the boxes represents the inter-quantile range. The upper and lower whiskers represent the minimum and maximum values of data