POX — Triticum aestivum

Summary

TRAESCS5D02G144300 (TaPOX, also known as TaPRX52-5D) on wheat chromosome 5D 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 activation of syringal lignin anabolism, xylem development, the ascorbate-glutathione cycle, and hydrogen peroxide catabolism, and is linked to apoplast, cell wall, vacuole, and mitochondrial localisation. TaPOX is associated with drought susceptibility index, canopy temperature, anther extrusion, spikelet fertility, pollen fertility, heat tolerance, water use efficiency, net photosynthetic rate, transpiration rate, stomatal resistance, root volume, stem and culm length, spike length, leaf weight, starch and flavonoid content, and heterosis. It is also associated with resistance to Botrytis cinerea, disease resistance, photoperiod stress response, cell proliferation, and leaf development. Studies of related genes in other species link the family to lignin composition and organ size.