CAT1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.7HG0751550 (CAT1) on barley chromosome 7H encodes a catalase enzyme (EC 1.11.1.6) with additional annotated molecular functions including S-nitrosylase, nucleoside diphosphate kinase, histone acetyltransferase, and heme-binding activities. The protein is associated with the peroxisomal lumen, tonoplast, chloroplast envelope, and apoplast. CAT1 is associated with cold and osmotic stress tolerance in barley, and with biological processes including cellular oxidant detoxification, hydrogen peroxide and nitric oxide homeostasis, regulation of ethylene signaling, and responses to heat, superoxide, xenobiotic stimuli, and oomycetes. The gene is associated with numerous agronomic traits such as grain filling period, seed yield, biomass yield, photosynthetic rate, leaf chlorosis, root thickness, nitrate uptake, auxin sensitivity, stomatal closure, and disease tolerance. Studies of related genes in other species link it to catalase activity, programmed cell death, disease resistance, and peroxisomal function.