POX — Triticum aestivum

Summary

TaPOX (TRAESCS4A02G196000) on wheat chromosome 4A encodes a secretory haem peroxidase (EC 1.11.1.7) with lactoperoxidase and peroxidase activity, heme binding, and protein phosphorylated amino acid binding. The gene is associated with activation of syringal lignin anabolism, xylem development, the ascorbate-glutathione cycle, and hydrogen peroxide catabolism. It localises to the apoplast, plant-type cell wall, vacuole, Golgi, mitochondria, and cytosol. TaPOX is linked to numerous agronomic traits including drought susceptibility, canopy temperature, water use efficiency, heat and cold tolerance, spike length, ear number, spikelet fertility, stem length, root volume, net photosynthetic rate, quantum yield, transpiration rate, stomatal resistance, starch content, flavonoid content, proline content, and nitrate uptake. It is also associated with resistance to Botrytis cinerea, disease resistance, photoperiod stress response, and cell proliferation. Studies of related genes in other species link the peroxidase family to lignin composition, salt tolerance, and organ size.