APX — Beta vulgaris subsp. vulgaris

Summary

BvAPX (BVRB_9G207350) on sugar beet chromosome 9 encodes a haem peroxidase with L-ascorbate peroxidase activity, also annotated with p-coumarate 3-hydroxylase, protein kinase, siRNA and miRNA binding, and RNA endonuclease activities. The product is associated with cellular response to oxidative stress, putrescine, pectin, polyamine, auxin and melatonin metabolism, cell cycle G2/M phase transition, positive regulation of stomatal complex development, gene silencing by miRNA, and detection of peptidoglycan. It localises to the peroxisome membrane, chloroplast thylakoid membrane, stress granule, plasmodesma, Golgi, mitochondria and extracellular regions. The gene is linked to root yield, leaf dry weight, chlorophyll content, net photosynthetic rate, starch content, bacterial blight disease resistance, aphid response, seed viability, days to flowering, and hydrogen peroxide content. Related genes in other species connect the family to drought, heat, high-light, salt and oxidative stress tolerance, photoprotection, water-use efficiency, thermomemory, and pathogen defence.