AAO — Daucus carota subsp. sativus

Summary

DCAR_018979 (DcAAO, also known as DcMCO2 and DcMCO3) on carrot chromosome 5 encodes a copper-containing oxidase with L-ascorbate oxidase activity (EC 1.10.3.3) and p-diphenol:oxygen oxidoreductase activity. The protein belongs to the multicopper oxidase family and is predicted to localize to the apoplast, plant-type cell wall, plastid, and plasmodesmata. DcAAO is associated with ascorbate catabolism, lignin breakdown, responses to hydrogen peroxide, oxidative stress, jasmonic acid, iron, and viruses, as well as defense responses and downregulation of antiviral responses. It is linked to salinity response and its inhibition, and to photosynthetic rate. Studies of related genes in other species link the family to traits including iron content, sodium concentration, plant height, stem diameter, drought tolerance, and salt response.