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Wild wheat species  Aegilops peregrina  (U p U p S p S p ), harbours resistance to various diseases including leaf rust and stripe rust. Inheritance studies in a recombinant inbred line population of wheat -Ae. peregrina  introgression line IL pau16061 revealed the transfer of a single major dominant gene conditioning all stage resistance, herein temporarily designated as  LrAp . Genomic  in situ  hybridisation of IL pau16061, resistant and susceptible RILs with U- and S-genome DNA probes confirmed that the introgression with leaf rust resistance is from the U p  genome of  Ae. peregrina . Fluorescence  in situ  hybridisation using chromosome specific probes identified U p  genome introgression to be on the long arm of wheat chromosome 6B. To genetically map  LrAp , bulked segregant analysis was combined with  r esistance gene  en richment  seq uencing (MapRenSeq). Five nucleotide binding leucine-rich repeat contigs distinguished resistant and susceptible bulks and single nucleotide polymorphism (SNP) markers from these contigs co-segregated with  LrAp . All five RenSeq NB_ARC contigs showed identity with the long arm of wheat chromosome 6B confirming the introgression on 6BL which we propose is a compensating translocation from  Ae. peregrina  chromosome 6U p L due to homoeology between the alien and wheat chromosomes. The SNP markers developed in this study will aid in cloning and marker assisted gene pyramiding of  LrAp .

Discovery and characterisation of a new leaf rust resistance gene introgressed in wheat from wild wheat Aegilops peregrina