POX — Sorghum bicolor

Summary

SORBI_3008G010400 (SbPOX) encodes a secretory haem peroxidase (EC 1.11.1.7) with lactoperoxidase activity, heme binding, and protein phosphorylated amino acid binding. This sorghum gene on chromosome 8 is associated with xylem development, activation of syringyl lignin anabolism, hydrogen peroxide catabolism, response to oxidative stress, defense response, brassinosteroid-mediated signaling, cellular response to hypoxia, and protein secretion. The encoded peroxidase localizes to the apoplast, plant-type cell wall, vacuole, Golgi, mitochondria, and cytosol. SbPOX is linked to grain yield, drought tolerance, photosynthetic rate, transpiration rate, stomatal resistance, chlorophyll content, carbohydrate content, proline content, root length, seedling growth, nitrate uptake, and ethylene sensitivity. Studies of related genes in other species connect the family to lignin composition and biosynthesis, salt tolerance, and organ size.