PR3 — Cucumis sativus

Summary

CsPR3 (CSA_6G508020) on cucumber chromosome 6 encodes a chitinase with beta-N-acetylglucosaminidase activity, belonging to the glycosyl hydrolase 19 family and containing a chitin-binding domain. This gene is associated with chitin breakdown, cell wall macromolecule catabolism, and defense responses, including pathogen defense, systemic acquired resistance, and hypersensitive response-programmed cell death. It has been linked to ethylene sensitivity, photosynthetic rate, and traits such as disease resistance, salt tolerance, seed germination under salt stress, and nematode resistance. The encoded protein localizes to secretory vesicles, vacuoles, and the extracellular space. Studies of related genes in other species connect the family to virus resistance, Botrytis cinerea resistance, and bacterial wilt resistance.