PPO — Solanum tuberosum

Summary

PGSC0003DMG400029575, the potato gene PPO (also known as PPOB, StPPO, or co-2) on chromosome 8, encodes a polyphenol oxidase enzyme with catecholase activity (EC 1.10.3.1) that binds copper and localises to the chloroplast thylakoid lumen. This gene is associated with tuber browning, enzymatic discoloration, black spot bruise sensitivity, and soft rot resistance, as well as with traits including flour colour, phenolic compound content, anthocyanin content, carotenoid content, starch digestibility, and bacterial blight disease resistance. It has also been connected to leaf relative water content, photosynthetic rate, respiration rate, and hydrogen peroxide content. Related genes in other species are linked to enzymatic browning and bacterial disease resistance.