NHX1 — Oryza sativa Indica Group

Summary

BGIOSGA026347 (OiNHX1) on chromosome 7 of Indica rice encodes a sodium:hydrogen exchanger with potassium:proton antiporter and sodium transporter activities, belonging to the cation/H+ exchanger CPA1 family. The protein localises to the vacuolar membrane, vacuole, plastid, mitochondria, cytosol and plasmalemma. OiNHX1 is associated with salt and drought tolerance, seedling and grain traits, yield, shoot and root development, lateral root formation, pollen, vascular bundles, stomatal regulation and closure, abiotic stress responses, and activation of salinity response. It is linked to biological processes including vacuolar membrane transport, sodium and potassium ion membrane transport, cell pH regulation, regulation of ion transport and stomatal closure, leaf development, and photosynthesis. Studies of related genes in other species connect the family to potassium accumulation, vacuolar pH homeostasis, ion homeostasis, heat tolerance, seed germination, biomass production and disease resistance.