The probes that identified several RFLP markers
flanking the barley Mla locus on chromosome 1HS detected
orthologous markers flanking rust resistance genes
on chromosome arms 1RS and 1DS. RGA probe,
RGA39, derived from a member of the Mla gene family,
identified markers within the rye segments of ‘Imperial’
carrying SrR and ‘Petkus’ carrying Lr26, Sr31 and Yr9.
RGA39 also mapped to two loci linked to the stem rust
resistance gene Sr33 located on chromosome 1DS of
Ae. tauschii. Whether Sr33 is orthologous to either SrR
or Sr31, cannot be determined.