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Wheat Pm4 resistance to powdery mildew is controlled by alternative splice variants encoding chimeric proteins


Sánchez-Martín, Javier; Widrig, Victoria; Herren, Gerhard; Wicker, Thomas; Zbinden, Helen; Gronnier, Julien; Spörri, Laurin; Praz, Coraline R; Heuberger, Matthias; Kolodziej, Markus C; Isaksson, Jonatan; Steuernagel, Burkhard; Karafiátová, Miroslava; Doležel, Jaroslav; Zipfel, Cyril; Keller, Beat (2021). Wheat Pm4 resistance to powdery mildew is controlled by alternative splice variants encoding chimeric proteins. Nature Plants, 7(3):327-341.

Abstract

Crop breeding for resistance to pathogens largely relies on genes encoding receptors that confer race-specific immunity. Here, we report the identification of the wheat Pm4 race-specific resistance gene to powdery mildew. Pm4 encodes a putative chimeric protein of a serine/threonine kinase and multiple C2 domains and transmembrane regions, a unique domain architecture among known resistance proteins. Pm4 undergoes constitutive alternative splicing, generating two isoforms with different protein domain topologies that are both essential for resistance function. Both isoforms interact and localize to the endoplasmatic reticulum when co-expressed. Pm4 reveals additional diversity of immune receptor architecture to be explored for breeding and suggests an endoplasmatic reticulum-based molecular mechanism of Pm4-mediated race-specific resistance.

Abstract

Crop breeding for resistance to pathogens largely relies on genes encoding receptors that confer race-specific immunity. Here, we report the identification of the wheat Pm4 race-specific resistance gene to powdery mildew. Pm4 encodes a putative chimeric protein of a serine/threonine kinase and multiple C2 domains and transmembrane regions, a unique domain architecture among known resistance proteins. Pm4 undergoes constitutive alternative splicing, generating two isoforms with different protein domain topologies that are both essential for resistance function. Both isoforms interact and localize to the endoplasmatic reticulum when co-expressed. Pm4 reveals additional diversity of immune receptor architecture to be explored for breeding and suggests an endoplasmatic reticulum-based molecular mechanism of Pm4-mediated race-specific resistance.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Plant and Microbial Biology
07 Faculty of Science > Zurich-Basel Plant Science Center
Dewey Decimal Classification:580 Plants (Botany)
Scopus Subject Areas:Life Sciences > Plant Science
Language:English
Date:1 March 2021
Deposited On:23 Mar 2021 14:00
Last Modified:26 Mar 2024 02:35
Publisher:Nature Publishing Group
ISSN:2055-026X
OA Status:Closed
Publisher DOI:https://doi.org/10.1038/s41477-021-00869-2
PubMed ID:33707738