POX — Triticum aestivum

Summary

TRAESCS5A02G148600, designated TaPOX (also known as TaPRX52-5A, TaPER4-5A, and TaPRX130), encodes a secretory haem peroxidase on wheat chromosome 5A. The enzyme exhibits peroxidase and lactoperoxidase activity, binds heme and metal ions, and is annotated to protein phosphorylated amino acid binding. TaPOX is associated with hydrogen peroxide catabolism, the ascorbate-glutathione cycle, activation of syringal lignin anabolism, phenylpropanoid metabolism, xylem development, and responses to reactive oxygen species. It localizes to the apoplast, plant-type cell wall, vacuole, Golgi, mitochondria, and cytosol. The gene has been linked to numerous agronomic traits including drought susceptibility, canopy temperature, water use efficiency, heat tolerance, net photosynthetic rate, spikelet fertility, tiller number, stem length, root volume, and starch content. Associations with disease resistance, particularly to Botrytis cinerea, and photoperiod stress response have also been noted. Studies of related genes in other species connect the family to lignin composition and salt tolerance.