highly significantP < 0.05
Among these, two markers, WmGSB1.1–2 (Chr01_28,572,939) and WmGSB1.1–7 (Chr01_28,931,313), were found to be highly associated with GSB resistance in watermelon accessions (both match 6 out of 8 accessions), with a highly significant correlation between marker genotyping and F2 population PDI scores (R 2 value of 9.48 and 7.92%, respectively at P < 0.05) (Figs. 4 and S 2 ).