APX — Pisum sativum

Summary

PSAT7G223000 (APX, APX1) on garden pea chromosome 7LG7 encodes an L-ascorbate peroxidase (EC 1.11.1.11), a haem peroxidase family member with additional annotated activities including p-coumarate 3-hydroxylase, siRNA binding, and protein kinase activity. The gene is associated with the ascorbate-glutathione cycle, cellular response to oxidative stress, oxygen metabolism, auxin breakdown, and positive regulation of stomatal complex development. It localises to the peroxisome membrane, chloroplast thylakoid membrane, and stress granules. APX1 is associated with numerous agronomic traits including drought tolerance, waterlogging tolerance, bacterial blight disease resistance, submergence tolerance, seed weight, germination rate, seedling vigor, net photosynthetic rate, water use efficiency, and starch and protein content. Studies of related genes in other species link the family to heat, salt, oxidative, and high-light stress tolerance, as well as root development and pathogen defense.