Our work sheds light on the emerging role of kinase fusion proteins in wheat disease resistance, expanding the repertoire of disease-resistance genes for breeding.īread wheat ( Triticum aestivum 2 n=6 x=42 AABBDD genome) is one of the most widely cultivated crops worldwide 4. Cytogenetic and haplotype analyses corroborate that the two genes originate from the same translocation event. We likewise cloned Lr58, which was reportedly introgressed from Aegilops triuncialis 3, but has an identical coding sequence compared to Lr9. umbellulata Lr9 donor enabled us to assemble the ~28.4-Mb Lr9 translocation and to identify the translocation breakpoint. Long-read sequencing of a wheat Lr9 introgression line and the putative Ae. We established that Lr9 encodes an unusual tandem kinase fusion protein. Here we use mutagenesis and transcriptome sequencing to clone the leaf rust resistance gene Lr9, which was introduced into bread wheat from the wild grass species Aegilops umbellulata 2. The introgression of chromosome segments from wild relatives is an established strategy to enrich crop germplasm with disease-resistance genes 1.
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