POX (TRAESCS4A02G196300) — triticum aestivum

Summary

TaPOX (TRAESCS4A02G196300) on wheat chromosome 4A encodes a haem peroxidase (EC 1.11.1.7) with lactoperoxidase and peroxidase activity, heme binding, and protein phosphorylated amino acid binding. The protein localises to the apoplast, cell wall, vacuole, Golgi, mitochondria, and cytosol. TaPOX is associated with activation of syringal lignin anabolism, the ascorbate-glutathione cycle, phenylpropanoid metabolism, xylem development, and responses to reactive oxygen species. It has been linked to drought susceptibility, canopy temperature, water use efficiency, heat and cold tolerance, net photosynthetic rate, transpiration rate, stomatal resistance, spikelet fertility, ear number, spike length, stem and culm length, leaf weight, root volume, relative growth rate, quantum yield, starch and flavonoid content, proline content, nitrate uptake, and seedling growth. The gene is also connected to disease resistance, including against Botrytis cinerea, and photoperiod stress response. Studies of related genes in other species link the peroxidase family to lignin composition, salt tolerance, and organ size.