The barley immune receptor Mla recognizes multiple pathogens and contributes to host range dynamics

Jan Bettgenhaeuser, Inmaculada Hernández-Pinzón, Andrew M. Dawson, Matthew Gardiner, Phon Green, Jodie Taylor, Matthew Smoker, John N. Ferguson, Peter Emmrich, Amelia Hubbard, Rosemary Bayles, Robbie Waugh, Brian J. Steffenson, Brande B. H. Wulff, Antonín Dreiseitl, Eric R. Ward and Matthew J. Moscou ()
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Jan Bettgenhaeuser: University of East Anglia
Inmaculada Hernández-Pinzón: University of East Anglia
Andrew M. Dawson: University of East Anglia
Matthew Gardiner: University of East Anglia
Phon Green: University of East Anglia
Jodie Taylor: University of East Anglia
Matthew Smoker: University of East Anglia
John N. Ferguson: University of East Anglia
Peter Emmrich: University of East Anglia
Amelia Hubbard: NIAB
Rosemary Bayles: NIAB
Robbie Waugh: The James Hutton Institute, Invergowrie
Brian J. Steffenson: University of Minnesota
Brande B. H. Wulff: University of East Anglia
Antonín Dreiseitl: Agrotest Fyto Ltd
Eric R. Ward: University of East Anglia
Matthew J. Moscou: University of East Anglia

Nature Communications, 2021, vol. 12, issue 1, 1-14

Abstract: Abstract Crop losses caused by plant pathogens are a primary threat to stable food production. Stripe rust (Puccinia striiformis) is a fungal pathogen of cereal crops that causes significant, persistent yield loss. Stripe rust exhibits host species specificity, with lineages that have adapted to infect wheat and barley. While wheat stripe rust and barley stripe rust are commonly restricted to their corresponding hosts, the genes underlying this host specificity remain unknown. Here, we show that three resistance genes, Rps6, Rps7, and Rps8, contribute to immunity in barley to wheat stripe rust. Rps7 cosegregates with barley powdery mildew resistance at the Mla locus. Using transgenic complementation of different Mla alleles, we confirm allele-specific recognition of wheat stripe rust by Mla. Our results show that major resistance genes contribute to the host species specificity of wheat stripe rust on barley and that a shared genetic architecture underlies resistance to the adapted pathogen barley powdery mildew and non-adapted pathogen wheat stripe rust.

Date: 2021
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DOI: 10.1038/s41467-021-27288-3

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