NHX1 — Brassica juncea

Summary

BJUA05G37090S (BjNHX2) encodes a sodium:hydrogen exchanger belonging to the NaH_exchanger and cation/H_exchanger_CPA1 families, with potassium:proton antiporter and sodium transporter activities. It is associated with vacuolar membrane transport, sodium import, potassium ion import across the plasma membrane, cell pH regulation, photoprotection, detoxification, calcium signaling, regulation of stomatal closure, chlorophyll fluorescence, stress response, and activation of salinity response. The gene is linked to chlorophyll content, plant growth, stomatal closure, transpiration, auxin homeostasis, cell expansion, hypocotyl elongation, flower development, potassium ion homeostasis, microtubule organization, root growth directionality, gravitropism, vacuolar pH, and vacuolar ion homeostasis. Studies of related genes in other species connect the family to salt tolerance and vacuolar pH regulation.