AAO — Daucus carota subsp. sativus

Summary

DCAR_026694 (DcAAO, also known as DcMCO2 and DcMCO3) on carrot chromosome 8 encodes a copper-containing L-ascorbate oxidase, a member of the multicopper oxidase family with cupredoxin domains. The enzyme exhibits L-ascorbate oxidase activity, p-diphenol:oxygen oxidoreductase activity, copper binding, and redox activity. It is associated with ascorbate catabolism, lignin breakdown, response to hydrogen peroxide, oxidative stress, jasmonic acid, viruses, and iron, as well as downregulation of antiviral response and inhibition of salinity response. The protein localizes to the apoplast, plant-type cell wall, plastid, plasmodesma, and extracellular space. DcAAO is linked to photosynthetic rate and iron transport. Studies of related genes in other species connect the family to traits including iron content, sodium concentration, salt and drought tolerance, plant height, stem diameter, stomatal resistance, and net photosynthetic rate.