Figure 1. Alignment of four genetic maps of chromosome 1DS to compare the relative positions of microsatellite loci, Lr60 and Lr21. The map of RL6043/RL6172 was constructed from an F2 population and the genetic distance based on the frequency of leaf rust susceptible progeny. The map of CDC Alsask/Alsen was based on 47 doubled haploid (DH) lines. The map of RL6172/AC Foremost was based on 24 homozygous resistant (Lr60) and 24 homozygous susceptible F2 plants. The map of SV8021V2/AC Karma has produced from 92 DH lines. Map distances are in centimorgans.