APX — Beta vulgaris subsp. vulgaris

Summary

BvAPX (BVRB_9G220450) on sugar beet chromosome 9 encodes a haem peroxidase with L-ascorbate peroxidase activity, along with additional annotated molecular functions including p-coumarate 3-hydroxylase, siRNA binding, and protein kinase activities. The gene is associated with cellular response to oxidative stress, putrescine and polyamine metabolism, auxin metabolism, and positive regulation of stomatal complex development. It localises to the peroxisome membrane, chloroplast thylakoid membrane, and stress granules. Associations with agronomic traits include root yield, root fresh weight, leaf dry weight, net photosynthetic rate, starch content, seed viability, days to flowering, bacterial blight disease resistance, and aphid response. The gene is also linked to phenotypes such as drought tolerance, heat stress tolerance, waterlogging tolerance, photoprotection, and hydrogen peroxide homeostasis. Related genes in other species connect the family to oxidative stress tolerance, high-light stress tolerance, and thermotolerance.