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Plant resistance genes typically encode proteins with nucleotide binding site-leucine rich repeat (NLR) domains. Here we show that  Ptr  is an atypical resistance gene encoding a protein with four Armadillo repeats.  Ptr  is required for broad-spectrum blast resistance mediated by the NLR  R  gene  Pi-ta  and by the associated  R  gene  Pi-ta2 .  Ptr  is expressed constitutively and encodes two isoforms that are mainly localized in the cytoplasm. A two base pair deletion within the  Ptr  coding region in the fast neutron-generated mutant line M2354 creates a truncated protein, resulting in susceptibility to  M. oryzae . Targeted mutation of  Ptr  in a resistant cultivar using CRISPR/Cas9 leads to blast susceptibility, further confirming its resistance function. The cloning of  Ptr  may aid in the development of broad spectrum blast resistant rice.

The rice blast resistance gene Ptr encodes an atypical protein required for broad-spectrum disease resistance