Together with RPP13L4/ZAR1, involved in the ambient temperature (above 22 degrees Celsius)-sensitive aerial organ development (PubMed:28499073). Together with RPP13L4/ZAR1, involved in the regulation of the ambient temperature-sensitive intersection of growth and immune response in the absence of pathogens, by repressing the transcription of SNC1 (PubMed:28499073). Probable non-functional kinase required for recognition of the Pseudomonas syringae type III effector HopZ1a by RPP13L4/ZAR1 and to trigger subsequent defense responses (PubMed:24170858, PubMed:26355215, PubMed:28652264). May. function as a decoy to trap HopZ1a in the ZAR1 complex for recognition by the plant immune system (PubMed:24170858). Interacts with RPP13L4/ZAR1. Associates with the plasma membrane in the presence of the Xanthomonas campestris effector XopAC/AvrAC. Expressed in seedlings, young leaves, floral organs, shoot apical meristems (SAM) and inflorescence stems. Induced by the elevation of ambient temperature both in the nucleus and the cytosol. The protein kinase domain is predicted to be catalytically inactive. Reduced resistance to Pseudomonas syringae expressing HopZ1a (PubMed:26355215). The double mutant zed1-6 zrk12-1 exhibits short inflorescence stem and autoimmunity symptoms when grown at 25 degrees Celsius (PubMed:28499073). Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. ZRK subfamily. Extended N-terminus.