APX — Cucumis sativus

Summary

CsAPX (CSA_6G298480) on cucumber chromosome 6 encodes a haem peroxidase of the Ccp1-like family with L-ascorbate peroxidase activity (EC 1.11.1.11), also annotated for p-coumarate 3-hydroxylase, siRNA and miRNA binding, RNA endonuclease, and protein kinase activities. The gene is associated with the ascorbate-glutathione cycle, cellular response to oxidative stress, protein oxidation, bioluminescence, cell cycle G2/M phase transition, and positive regulation of stomatal complex development. It localises to the peroxisome membrane, chloroplast thylakoid membrane, stress granule, plasmodesma, and mitochondria. CsAPX is linked to numerous agronomic traits including leaf chlorophyll and carotene content, net photosynthetic rate, bacterial blight disease resistance, aphid response, shoot and stem fresh weight, root number, seed viability, days to flowering, and ethylene sensitivity. Related genes in other species are associated with drought, heat, salt, and high-light stress tolerance, oxidative stress resistance, hydrogen peroxide homeostasis, and pathogen defence.