TuRLK1, a leucine-rich repeat receptor-like kinase, is indispensable for stripe rust resistance of YrU1 and confers broad resistance to multiple pathogens

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Abstract

Background: YrU1 is a nucleotide-binding site (NBS) and leucine-rich repeat (LRR) protein (NLR), with additional ankyrin-repeat and WRKY domains and confers effective resistance to stripe rust fungus Puccinia striiformis f. sp. Tritici (Pst). YrU1 was positionally cloned in the progenitor species of the A genome of bread wheat, Tricicum urartu, recently. However, the molecular mechanism and components involved in YrU1-mediated resistance are not clear. Results: In this study, we found that the transcript level of TuRLK1, which encodes a novel leucine-rich repeat receptor-like kinase, was up-regulated after inoculation with Pst in the presence of YrU1, through RNA-seq analysis in T. urartu accession PI428309. TuRLK1 contained only a small number of LRR motifs, and was localized in the plasma-membrane. Transient expression of TuRLK1 induced hypersensitive cell death response in N. benthamiana leaves. Silencing of TuRLK1, using barley stripe mosaic virus (BSMV)-induced gene silencing (VIGS) system in PI428309 that contains YrU1, compromised the resistance against stripe rust caused by Pst CY33, indicating that TuRLK1 was required for YrU1-activated plant immunity. Furthermore, overexpression of TuRLK1 could enhance powdery mildew resistance in bread wheat and Arabidopsis thaliana after inoculating with the corresponding pathogens. Conclusions: Our study indicates that TuRLK1 is required for immune response mediated by the unique NLR protein YrU1, and likely plays an important role in disease resistance to other pathogens.

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Zou, S., Tang, Y., Xu, Y., Ji, J., Lu, Y., Wang, H., … Tang, D. (2022). TuRLK1, a leucine-rich repeat receptor-like kinase, is indispensable for stripe rust resistance of YrU1 and confers broad resistance to multiple pathogens. BMC Plant Biology, 22(1). https://doi.org/10.1186/s12870-022-03679-6

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