NHX1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.2HG0115250 (HvNHX1) on barley chromosome 2H encodes a sodium:hydrogen exchanger with potassium:proton antiporter and sodium transporter activities, belonging to the NaH_exchanger and CPA1 cation/H+ exchanger families. The protein localises to the vacuolar membrane, vacuole, plastid, mitochondria, cytosol and plasmalemma. HvNHX1 is associated with salt stress response and regulation of monoatomic ion transport, vacuolar membrane transport, sodium import, potassium ion membrane transport, cell pH regulation, detoxification, stomatal closure, leaf development, and water use efficiency. It has been linked to traits including relative plant height, relative growth rate, quantum yield, photosynthetic rate, chlorophyll content, sugar content, and plant growth. Studies of related genes in other species connect the family to potassium uptake, vacuolar pH homeostasis, cell expansion, and heat tolerance.