POX — Triticum aestivum

Summary

TaPOX (TRAESCS4D02G116700) on wheat chromosome 4D encodes a secretory class III peroxidase (EC 1.11.1.7) with haem-binding and lactoperoxidase activity. The enzyme is associated with hydrogen peroxide catabolism, the ascorbate-glutathione cycle, and activation of syringyl lignin anabolism, as well as phenylpropanoid and polyamine metabolism. It localises to the apoplast, cell wall, vacuole, Golgi, mitochondria and cytosol. TaPOX is linked to numerous agronomic traits including drought susceptibility, canopy temperature, water use efficiency, net photosynthetic rate, heat and cold tolerance, spikelet fertility, ear number, spike length, stem length, root volume, starch content, flavonoid content, and seedling growth. It is also associated with disease resistance, particularly against Botrytis cinerea, and with photoperiod stress response. Studies of related genes in other species connect the family to lignin composition, salt tolerance, and organ size regulation.