POX — Triticum aestivum

Summary

TRAESCS5B02G147200 (TaPOX) on bread wheat chromosome 5B encodes a secretory haem peroxidase (EC 1.11.1.7) with lactoperoxidase and peroxidase activity, heme binding, and protein phosphorylated amino acid binding. This gene is associated with diverse biological processes including activation of syringal lignin anabolism, cysteine homeostasis, glutathione and polyamine anabolism, the ascorbate-glutathione cycle, pigment anabolism, metabolic burst, regulation of phenylpropanoid metabolism, xylem development, and H2O2 catabolism. It localizes to the apoplast, plant-type cell wall, vacuole, Golgi, mitochondria, and cytosol. TaPOX is linked to agronomically important traits such as drought susceptibility, anther extrusion, spikelet fertility, stem and culm length, root volume, net photosynthetic rate, water use efficiency, heat tolerance, starch content, and heterosis. Studies of related genes in other species connect the family to lignin composition and disease resistance.