NHX1 — Brassica juncea

Summary

BJUB06G23250S (symbol NHX1, preferred name BjNHX8) on Indian mustard chromosome B06 encodes a cation/H⁺ exchanger of the CPA1 family with lithium:proton antiporter, potassium:proton antiporter and sodium:hydrogen exchanger activities. The gene is associated with vacuolar membrane and tonoplast localisation, cell pH regulation, vacuolar membrane transport, lithium export and sodium import. It has been connected to yield, chlorophyll content, photosynthetic rate, plant height, root development, drought tolerance, salt tolerance, disease tolerance, abscisic acid sensitivity, jasmonic acid sensitivity, UV-B light sensitivity, high temperature stress response, stomatal resistance, meristem identity, root oxidative activity, and sodium uptake. Studies of related genes in other species link the family to salt stress tolerance, sodium efflux, lithium homeostasis, potassium acquisition, circadian rhythm, and heat tolerance.