PR3 — Beta vulgaris subsp. vulgaris

Summary

BvPR3 (BVRB_3G057620) on sugar beet chromosome 3 encodes a protein with a glycosyl hydrolase family 19 catalytic domain and a chitin-binding domain, and is annotated with chitinase activity and chitin binding. This gene is associated with defence responses to fungi, cell wall macromolecule catabolic processes, chitin and polysaccharide breakdown, and hypersensitive response-programmed cell death. It is linked to jasmonic acid/ethylene-dependent systemic resistance and ethylene-mediated signalling. The encoded protein localises to secretory vesicles, vacuoles, the protoplasm and extracellular space. BvPR3 has been connected to pathogen and disease resistance, nematode resistance, salt tolerance, seed germination under salt stress, wilt symptom development, ethylene sensitivity, photosynthetic rate, root length, anthocyanin biosynthesis and mycorrhization. Studies of related genes in other species link the family to additional traits including fruit weight, leaf area, starch yield and seedling vigour.