NHX1 — Brassica juncea

Summary

BJUB07G32000S (BjNHX1) encodes a sodium/hydrogen exchanger belonging to the CPA1 family, with potassium:proton antiporter activity and sodium transporter activity. It is associated with vacuolar membrane transport, sodium import, cell pH regulation, photoprotection, detoxification, calcium signaling, regulation of stomatal closure, chlorophyll fluorescence, leaf development, and activation of salinity response. The gene is linked to photosynthetic rate, chlorophyll content, salt tolerance, hypocotyl elongation, plant growth, cell expansion, flower development, vacuolar pH, potassium homeostasis, root growth, stem internode length, auxin homeostasis, nitrogen assimilation, fiber yield, stomatal regulation, gravitropism, and apical dominance. Studies of related genes in other species link the family to salt tolerance, potassium uptake, pH homeostasis, heat and cold tolerance, seed germination, biomass production, and disease resistance.