PR3 — Cucumis sativus

Summary

CSA_6G507520 (PR3) on cucumber chromosome 6 encodes a chitinase with beta-N-acetylglucosaminidase and chitinase activity (EC 3.2.1.14), belonging to the glycosyl hydrolase 19 family and containing chitin-binding domains. The gene is associated with defense responses, including pathogen defense, systemic acquired resistance, and defense against fungi, as well as hypersensitive response cell death and hydrogen peroxide biosynthesis. It is linked to ethylene sensitivity, photosynthetic rate, disease tolerance, salt tolerance, seed germination under salt stress, nematode resistance, and wilt symptom development. The encoded protein localizes to secretory vesicles, vacuoles, and the extracellular space. Studies of related genes in other species connect the family to traits such as fruit weight, leaf area index, and harvest index, and to resistance against viruses, Botrytis cinerea, and bacterial wilt.