PR1 — Brassica juncea

Summary

BJUB02G09690S (BjPR1) on chromosome B02 of Indian mustard encodes a protein containing a CAP (cysteine-rich secretory protein) domain, placing it in the PR-1 family. The gene product exhibits cytokine activity and protein binding, and is associated with immune activation, priming of cellular stress responses, defence against fungi and other organisms, cell death, seed germination, and sexual reproduction. It localises to the extracellular space, plant-type cell wall, vacuole, and secretory vesicles. BjPR1 is associated with systemic acquired resistance, salicylic acid signalling, and resistance to multiple pathogens including Rhizoctonia solani, Pseudomonas syringae, Verticillium dahliae, and nematodes, as well as with salt tolerance, cadmium response, and aphid resistance. Studies of related genes in other species connect the PR-1 family to disease resistance, herbivore defence, and abiotic stress tolerance.