TaANK-TPR1 enhances wheat resistance against stripe rust via controlling gene expression and protein activity of NLR protein TaRPP13L1

Abstract

Nucleotide-binding site, leucine-rich repeat (NLR) proteins activate a robust immune response on recognition of pathogen invasion. However, the function and regulatory mechanisms of NLRs during Puccinia striiformis f. sp. tritici (Pst) infection in wheat remain elusive. Here, we identify an ankyrin (ANK) repeat and tetratricopeptide repeat (TPR)-containing protein, TaANK-TPR1, which plays a positive role in the regulation of wheat resistance against Pst and the immune response of NLR. TaANK-TPR1 targets the NLR protein TaRPP13L1 (Recognition of Peronospora Parasitica 13-like 1) to facilitate its homodimerization and cell death to enhance the resistance of wheat against Pst. Meanwhile, TaANK-TPR1 binds to the TGACGT motif (methyl jasmonate-responsive element) of the TaRPP13L1 promoter and activates TaRPP13L1 transcription. Both TaANK-TPR1 and TaRPP13L1 respond to jasmonic acid (JA) signaling via the TGACGT element. Importantly, overexpressing TaRPP13L1 confers robust rust resistance without impacting important agronomic traits in the field. These findings identify a regulatory mechanism of NLR protein and provide targets for improving crop disease resistance.