Involved in salicylic acid-dependent inducible resistance responses. May release an endogenous peptide elicitor required for the activation of inducible resistance mechanisms. Possesses protease activity in vitro. Gain-of-function mutant CDR1-D (T-DNA tagging) shows a dwarf phenotype with dark and curled leaves, constitutive expression of the pathogenesis-related genes PR1 and PR2, and resistance to virulent Pseudomonas syringae. Belongs to the peptidase A1 family. Extended C-terminus.