An Unusual Tandem Kinase Fusion Protein Confers Leaf Rust Resistance in Wheat

Overview

Journal Nat Genet

Specialty Genetics

Date 2023 May 22

PMID 37217716

Authors

Yajun Wang

Michael Abrouk

Spyridon Gourdoupis

Dal-Hoe Koo

Miroslava Karafiatova

Istvan Molnar

Katerina Holusova

Jaroslav Dolezel

Naveenkumar Athiyannan

Emile Cavalet-Giorsa

Lukasz Jaremko

Jesse Poland

Simon G Krattinger

Affiliations

Soon will be listed here.

Abstract

The introgression of chromosome segments from wild relatives is an established strategy to enrich crop germplasm with disease-resistance genes. 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. We established that Lr9 encodes an unusual tandem kinase fusion protein. Long-read sequencing of a wheat Lr9 introgression line and the putative Ae. umbellulata Lr9 donor enabled us to assemble the ~28.4-Mb Lr9 translocation and to identify the translocation breakpoint. We likewise cloned Lr58, which was reportedly introgressed from Aegilops triuncialis, but has an identical coding sequence compared to Lr9. Cytogenetic and haplotype analyses corroborate that the two genes originate from the same translocation event. 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.

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