AO — Triticum aestivum

Summary

TRAESCS7B02G265200, designated AO and also known as TaAAO1 or TaORAP1-7B, encodes an L-ascorbate oxidase on bread wheat chromosome 7B. The product belongs to the copper oxidase family, possesses L-ascorbate oxidase activity and p-diphenol:oxygen oxidoreductase activity, binds copper, and mediates redox activity. This gene is associated with ascorbate catabolism, lignin breakdown, cell wall polysaccharide breakdown, and responses to desiccation, oxidative stress, hydrogen peroxide, brassinosteroids, jasmonic acid, and viruses. It is linked to downregulation of antiviral responses, mucilage extrusion from seed coat, and multicellular organism development. The protein localizes to the apoplast, plasmodesma, and extracellular space. Associations with agronomic traits include spikelet length, spike length, anther length, photosynthetic rate, transpiration rate, water use efficiency, stomatal resistance, chlorophyll content, and drought tolerance, as well as drought sensitivity. Studies of related genes in other species link the broader copper oxidase family to similar oxidative processes.