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The wheat powdery mildew resistance gene Pm4 also confers resistance to wheat blast

by Tom O’Hara, Andrew Steed, Rachel Goddard, Kumar Gaurav, Sanu Arora, Jesús Quiroz-Chávez, Ricardo Ramírez-González, Roshani Badgami, David Gilbert, Javier Sánchez-Martín, Luzie Wingen, Cong Feng, Mei Jiang, Shifeng Cheng, Susanne Dreisigacker, Beat Keller, Brande B.H. Wulff, Cristóbal Uauy, and Paul Nicholson

Posted: September 28, 2023
Server: bioRxiv
DOI: 10.1101/2023.09.26.559489

Wheat blast, caused by the fungus Magnaporthe oryzae , threatens global cereal production since its emergence in Brazil in 1985 and recently spread to Bangladesh and Zambia. Here we demonstrate that the AVR-Rmg8 effector, common in wheat-infecting isolates, is recognised by the gene Pm4 , previously shown to confer resistance to specific races of Blumeria graminis f.sp. tritici , the cause of powdery mildew of wheat. We show that Pm4 alleles differ in their recognition of different AVR-Rmg8 alleles, and some confer resistance only in seedling leaves but not spikes making it important to select for those alleles that function in both tissues. This study has identified a gene recognising an important virulence factor present in wheat blast isolates in Bangladesh and Zambia and represents an important first step towards developing durably resistant wheat cultivars for these regions.

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