PR5 — Solanum lycopersicum

Summary

Tomato gene PR5 (SOLYC04G079890.4) encodes a thaumatin-like protein belonging to the osmotin/thaumatin-like superfamily, with glucan endo-1,3-beta-D-glucosidase activity and IgE binding capacity. In tomato, PR5 is associated with disease and pathogen resistance, including resistance to nematodes and tomato spotted wilt virus. The gene is linked to regulation of proline anabolism, lycopene anabolism, salicylic acid anabolism, auxin anabolism, chlorophyll anabolism, induced systemic resistance, response to arachidonate, response to host, spore germination, fermentation, photoperiodism, and metabolic burst. It localizes to the apoplast and extracellular space. Associations with acid sensitivity, abscisic acid sensitivity, fruit shape, sugar content, protein content, seed size, stomatal opening, and salt tolerance have also been noted. Studies of related genes in other species link the family to glucan endo-1,3-beta-glucosidase activity.