Fig. 3.

Stacking effect of individual QTLs that were detected in the Apache/Balance DH mapping population. Overall resistance to the five employed M. graminicola isolates (P) significantly (P = 0.01) increased with the number of QTLs in DH lines. SSSS and RRRR, representative of individual DH lines merely carrying markers of susceptibility or resistance alleles associated with QTLs on chromosomes 3AS, 6DS, 7DS (only the most common marker Xgwm111) and 1BS, respectively. RSSS and RRRS, individual DH lines with combinations of one resistance allele linked to a QTL and three susceptibility alleles or vice versa. RRSS, individual DH lines carrying two QTLs associated with resistance and two QTLs associated with susceptibility