POX — Brachypodium distachyon

Summary

BdPOX (BRADI_4G25660V3) on Brachypodium distachyon chromosome 4 encodes a secretory haem peroxidase with lactoperoxidase and peroxidase activity (EC 1.11.1.7). The gene is associated with activation of syringal lignin anabolism, xylem development, hydrogen peroxide catabolism, response to oxidative stress, cellular response to hypoxia, brassinosteroid-mediated signalling, and carbohydrate metabolism. The product localises to the apoplast, plant-type cell wall, vacuole, Golgi, mitochondria, cytosol and extracellular space. BdPOX is linked to ethylene sensitivity, nitrate uptake, water use efficiency, photosynthetic rate, stomatal resistance, leaf composition, seedling growth, and resistance to Botrytis cinerea and other diseases. Studies of related genes in other species connect the family to lignin composition and biosynthesis, salt tolerance, organ size, calcium signalling, and traits including drought susceptibility, seedling vigour, canopy temperature, stem diameter, lignin and cellulose content, and spikelet fertility.