Acts as negative regulator of disease resistance. Acts on basal resistance, age-related resistance and resistance mediated by the LRR receptor kinase XA21. Plants over-expressing NRR display enhanced susceptibility to the bacterial blight Xanthomonas oryzae pv. oryzae (Xoo) (PubMed:16115061). Binds to and represses NPR1/NH1-mediated transcriptional activation of LG2 in vitro (PubMed:22353606). Interacts with NPR1/NH1 (PubMed:16115061, PubMed:22353606, PubMed:24919709). Interacts with NPR3/NH3 (PubMed:24919709). Belongs to the NPR1-interactor family.