POX — Triticum aestivum

Summary

TRAESCS4D02G116600 (TaPOX) on wheat chromosome 4D encodes a secretory haem peroxidase (EC 1.11.1.7) with lactoperoxidase activity, heme binding, and protein phosphorylated amino acid binding. This gene is associated with diverse biological processes including activation of syringal lignin anabolism, the ascorbate-glutathione cycle, phenylpropanoid metabolism, xylem development, and responses to reactive oxygen species. It localises to the apoplast, plant-type cell wall, vacuole, Golgi, mitochondria, and cytosol. TaPOX is linked to numerous agronomic traits such as drought susceptibility, canopy temperature, stem and spike length, spikelet fertility, root volume, net photosynthetic rate, water use efficiency, heat and cold tolerance, starch content, and grain weight. It has also been connected to disease resistance, particularly against Botrytis cinerea, and to photoperiod stress response. Studies of related genes in other species link the family to lignin composition, salt tolerance, and lignin biosynthesis.