Involved in biotic and abiotic stress response, but not in systemic acquired resistance (SAR) (PubMed:14984927). Acts as a negative regulator of HIR1-mediated cell death responses (PubMed:20507517). Acts as a positive regulator of cell death induction by PR10 by promoting its phosphorylation and its ribonuclease activity (PubMed:22492811). Interacts (via LRR domain) with HIR1 (PubMed:20507517). Interacts with PR10 (PubMed:22492811). Expressed in phloem tissues of leaves, stems and green fruits during pathogen infection. Strongly up-regulated by pathogen infection (PubMed:10656596, PubMed:14984927, PubMed:20507517). Up-regulated by high salt and wounding (PubMed:14984927). Not induced by ethephon, ethylene, abscisic acid, salicylic acid or methyl jasmonate (PubMed:10656596, PubMed:20507517).