PR5 — Asparagus officinalis

Summary

A4U43_C06F17640, designated PR5 and also known as AoPR5, OSM-34 and AoTLP1, encodes a protein of the osmotin/thaumatin-like superfamily on asparagus chromosome 6. The product exhibits glucan endo-1,3-beta-D-glucosidase activity, binds IgE, mRNA and proteins, and localises to the apoplast, plant-type cell wall, secretory vesicle, vacuole, plasmodesma, membrane and mitochondria. The gene is associated with defence responses to bacteria, fungi and viruses, systemic acquired resistance, and responses to abscisic acid, ethylene, UV-B, cadmium and arachidonate. It is linked to regulation of anthocyanin biosynthesis and killing of other organisms. Associations with disease resistance, osmotic stress response, proline accumulation, and tolerance to salt, drought and Verticillium dahliae have been reported. Studies of related genes in other species link the family to pathogen resistance, induced systemic resistance, nematode resistance and seed germination under salt stress.