APX — Daucus carota subsp. sativus

Summary

DCAR_005477 (DcAPX) on carrot chromosome 2 encodes a haem peroxidase family protein with L-ascorbate peroxidase activity, heme binding, and additional annotated functions including p-coumarate 3-hydroxylase, siRNA/miRNA binding, RNA endonuclease, and protein kinase activities. The gene is associated with cellular response to oxidative stress, hydrogen peroxide catabolism, auxin metabolism, lignin anabolism, cell cycle G2/M phase transition, stomatal complex development, and adventitious root development. It localises to peroxisome membranes, chloroplast thylakoid membranes, mitochondria, stress granules, and plasmodesmata. DcAPX has been linked to traits including bacterial blight disease resistance, aphid response, biomass yield, seed viability, days to flowering, photosynthetic rate, ethylene sensitivity, jasmonic acid content, root length, and leaf senescence. Studies of related genes in other species connect the family to drought, heat, salt, and high-light stress tolerance, photoprotection, systemic acquired acclimation, and pathogen defense.