NHX1 — Cucumis sativus

Summary

CsNHX1 (CSA_1G178240) on cucumber chromosome 1 encodes a sodium/hydrogen exchanger belonging to the CPA1 family of cation/H⁺ exchangers, with lithium:proton and potassium:proton antiporter activity. The protein localises to the tonoplast, vacuolar membrane, endosomes and plastids, and is associated with vacuolar membrane transport, sodium and potassium ion homeostasis, cell pH regulation, brassinosteroid and nitric oxide anabolism, and response to superoxide. CsNHX1 has been linked to sodium exclusion, yield traits, photosynthetic rate, chlorophyll content, plant height, root development, and responses to high temperature, UV-B, abscisic acid, and disease. It is also connected to stomatal conductance, drought tolerance, auxin homeostasis, gravitropism, and cell expansion. Studies of related genes in other species link the family to vacuolar pH regulation, potassium accumulation, heat and cold tolerance, seed germination, and biomass production.