PR5 — Solanum lycopersicum

Summary

SlPR5 (PR5) on tomato chromosome 2 encodes a thaumatin-like protein with glucan endo-1,3-beta-D-glucosidase activity, capable of IgE and mRNA binding. It localises to the apoplast, cell wall, secretory vesicle, vacuole, plasmodesmata, membrane and mitochondria. The gene is associated with diverse biological processes including regulation of proline, lycopene, anthocyanin, auxin, ethylene, salicylic acid and chlorophyll anabolism, as well as ergosterol anabolism, photoperiodism, fermentation, response to cadmium, and killing of other organisms. It has been linked to traits such as fruit shape, sugar and protein content, seed size, stomatal opening, and sensitivity to acid and abscisic acid. Associations with disease resistance, fungal resistance, salt and drought tolerance, osmotic stress response, proline accumulation, and resistance to Verticillium dahliae and Pseudomonas syringae have been reported. Studies of related genes in other species link the family to ABA response and seed germination under salt stress.