Overlapping confidence intervals of QTLs for kernel number per spike (KNPS) based on MapQTL 6.0, IciMapping 4.1 and QTLNetwork 2.0. The segments in red are the overlapping confidence intervals of qKnps-4A, and the overlapping flanking markers of qKnps-4A are indicated by triangles in red, which were detected by QTLNetwork 2.0 based on the combined 10 environmental phenotypic values.