Figure 5

DArT-BSA genome scan for Al tolerance in the Dayton/Zhepi2 DH population. The difference in the frequency of the Dayton allele between two bulks with contrasting Al tolerance (20 plants each) is shown as a function of the cM positions of markers previously incorporated into a DArT consensus map for barley (446 of 490 polymorphic markers) [20]. The vertical lines within the panel denote borders between individual chromosomes. Horizontal lines indicate the 'pooling noise' and 'platform noise' significance thresholds as defined in Figure 3, using Dayton and Zhepi2 instead of Steptoe and Morex. The black arrow indicates the approximate position of the Alt locus which was identified in other populations as the principal locus conferring Al resistance in barley [24–30].