APX — Solanum tuberosum

Summary

PGSC0003DMG400030063 (APX) on potato chromosome 6 encodes an ascorbate peroxidase (EC 1.11.1.7), a haem peroxidase family member with L-ascorbate peroxidase activity and additional annotated functions including p-coumarate 3-hydroxylase, siRNA/miRNA binding, and protein kinase activities. The gene is associated with diverse biological processes such as malate secretion, skin development, wound healing, energy homeostasis, and regulation of flavonoid biosynthesis. It localises to multiple compartments including the peroxisome membrane, chloroplast thylakoid membrane, stress granules, and plasmodesmata. APX is linked to numerous agronomic traits including drought sensitivity, bacterial blight disease resistance, aphid response, plant fresh weight, reducing sugar content, leaf relative water content, and hydrogen peroxide content. Phenotypic associations include heat stress memory, water-use efficiency, photoprotection, photo-oxidative stress response, and stomatal development. Studies of related genes in other species connect the family to oxidative stress tolerance, heat and salt tolerance, root development, and resistance to fungal pathogens.