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). Interacts with NPR1/NH1 (PubMed:16115061, PubMed:15986920). Interacts with NPR2/NH2 (PubMed:15986920). Belongs to the NPR1-interactor family.