POX — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.5HG0464630 (HvPOX) on barley chromosome 5H encodes a secretory haem peroxidase (EC 1.11.1.7) with lactoperoxidase, peroxidase, heme-binding and protein-binding activities. The enzyme is associated with apoplast, cell wall, vacuole, Golgi, mitochondria and cytosol localisation. It has been linked to lignin anabolism, xylem development, hydrogen peroxide catabolism, response to oxidative stress, water response, hypoxia response, brassinosteroid signalling and homeostasis. Agronomically, HvPOX is associated with grain yield, grain weight, biological yield, spike length, culm length, stem length, root length, grains per spike, chlorophyll content, photosynthetic rate, protein content, flavonoid content, proline content, nitrate uptake, ethylene sensitivity, growth stage, disease resistance, Botrytis cinerea resistance, photoperiod stress response, cell proliferation, leaf development and seedling growth. Studies of related genes in other species link the family to lignin composition, salt tolerance and organ size.