AO — Cucumis sativus

Summary

CsAO (CSA_6G500640) on cucumber chromosome 6 encodes a copper-containing oxidase of the L-ascorbate oxidase family, with L-ascorbate oxidase activity and p-diphenol:oxygen oxidoreductase activity. The gene is associated with ascorbate catabolism, lignin breakdown, and redox activity, and its product localizes to the apoplast, plasmodesmata, and extracellular space. CsAO is linked to responses to salt, hydrogen peroxide, jasmonic acid, and viruses, as well as upregulation of defense against insects and downregulation of antiviral responses. It is associated with leaf color, respiration rate, oxidative stress response, drought tolerance, and iron transport. Studies of related genes in other species connect the family to traits including chlorophyll content, flavonoid content, shoot biomass, stomatal resistance, and spider mite resistance.