POX — Triticum aestivum

Summary

TRAESCS4D02G117100, designated TaPOX on chromosome 4D of bread wheat, encodes a haem peroxidase (EC 1.11.1.7) with lactoperoxidase activity, heme binding, and protein phosphorylated amino acid binding. This secretory peroxidase is localized to the apoplast, cell wall, vacuole, Golgi, mitochondria, and cytosol. TaPOX is associated with hydrogen peroxide catabolism, the ascorbate-glutathione cycle, activation of syringyl lignin anabolism, phenylpropanoid metabolism, xylem development, and responses to abiotic stimuli. It has been linked to drought susceptibility index, canopy temperature, spike length, ear number, stem length, grain weight, water use efficiency, net photosynthetic rate, transpiration rate, flavonoid content, starch content, and seedling growth. Associations with resistance to Botrytis cinerea and disease resistance have also been noted. Studies of related genes in other species connect the family to lignin composition, salt tolerance, and organ size.