PR3 — Solanum lycopersicum

Summary

SlPR3 (SOLYC10G055810.2) encodes a protein with chitinase activity and chitin binding, belonging to the glycosyl hydrolase 19 family. In tomato, this gene is associated with virus resistance and has been linked to diverse biological processes including chitin breakdown, cell wall macromolecule catabolic process, induced systemic resistance, jasmonic acid/ethylene-dependent systemic resistance, stomatal closure, abscission, pigmentation, lycopene and terpenoid anabolism, chlorophyll metabolism, nitrogen fixation, fermentation, detoxification, and salivation. The encoded protein localizes to secretory vesicles, vacuoles, and the extracellular space. Associations with agronomically relevant traits include pathogen and disease resistance, salt tolerance, seed germination under salt stress, nematode resistance, bacterial wilt resistance, and effects on plant height, stem diameter, leaf chlorosis, leaf curling, chlorophyll content, photosynthetic rate, sugar content, seed maturation, and seed dormancy. Studies of related chitinases in other species link the family to disease resistance against Botrytis cinerea and pathogen defense.