AO — Pisum sativum

Summary

PsAO (PSAT7G053040) on garden pea chromosome 7LG7 encodes an L-ascorbate oxidase, a copper-binding cupredoxin-domain enzyme (EC 1.10.3.3) with L-ascorbate oxidase and p-diphenol:oxygen oxidoreductase activities. The gene is associated with ascorbate catabolism, lignin breakdown, electron transfer, and redox activity, as well as cell cycle control, seed development, and nodulation. It is linked to responses to iron, hydrogen peroxide, jasmonic acid, and viruses, and to the upregulation of defense against insects and downregulation of antiviral responses. The product localizes to the apoplast, plasmodesmata, and extracellular space. Studies of related genes in other species link the family to drought tolerance and iron content traits, and to spider mite resistance and susceptibility.