PR5 — Capsicum annuum

Summary

CaPR5 (T459_17947) on pepper chromosome 6 encodes a thaumatin-like protein with glucan endo-1,3-beta-D-glucosidase activity, capable of IgE and mRNA binding. The protein localises to the apoplast, cell wall, vacuole, plasmodesmata, secretory vesicles, membrane and mitochondria. CaPR5 is associated with defence responses to bacteria, fungi and viruses, systemic acquired resistance, innate immunity, hypersensitivity, cell death, the metabolic burst, and regulation of anthocyanin biosynthesis. It has been linked to responses to ethylene, UV-B, cadmium, arachidonate, and to virus-induced post-transcriptional gene silencing. Associations with agronomic traits include plant height, stem diameter, leaf area index, chlorophyll content, osmotic stress response, proline accumulation, salt and drought tolerance, and resistance to Verticillium dahliae and Pseudomonas syringae. Studies of related genes in other species connect the family to pathogen resistance, induced systemic resistance, herbivore defence, seed germination under salt stress, and cell wall integrity.