PR1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.5HG0519270, designated HvPR1 on barley chromosome 5H, encodes a protein containing a CAP (cysteine-rich secretory protein) domain characteristic of the PR-1 family. The gene is associated with cytokine activity and protein binding, and its product localises to the secretory vesicle, vacuole, plant-type cell wall and extracellular space. HvPR1 is associated with activation of immune response, cytokine production, defence against bacteria and herbivores, and responses to salicylic acid, jasmonic acid, ethylene and wounding. It is also associated with leaf senescence, embryogenesis, sexual reproduction and proteolysis. Associations with disease resistance, systemic acquired resistance, salt tolerance, lateral root development, and resistance to pathogens including Rhizoctonia solani and Pseudomonas syringae have been reported. Studies of related genes in other species link the PR-1 family to salicylic acid-mediated defence, fungal disease resistance and abiotic stress tolerance.