NHX1 — Brassica juncea

Summary

BJUA02G05040S (BjNHX1) on Indian mustard chromosome A02 encodes a sodium/hydrogen exchanger belonging to the NaH_exchanger and CPA1 cation/H+ exchanger families, with potassium:proton antiporter and sodium transporter activities. The gene is associated with vacuolar membrane localisation and linked to sodium ion membrane transport, vacuolar membrane transport, cell pH regulation, photoprotection, detoxification, calcium signaling, regulation of stomatal closure, chlorophyll fluorescence, leaf development, and stress response. Associations include photosynthetic rate, chlorophyll content, salinity tolerance, hypocotyl elongation, cell expansion, flower development, vacuolar pH, potassium homeostasis, root growth, stem internode length, auxin homeostasis, nitrogen assimilation, fiber yield, stomatal regulation, and gravitropism. Studies of related genes in other species link the family to salt tolerance, potassium uptake, Na+/H+ transport activity, pH homeostasis, heat and cold tolerance, seed germination, biomass production, and disease resistance.