NHX8 — Brassica napus

Summary

BnNHX8 (NHX8) on chromosome C09 of oilseed rape encodes a cation/proton exchanger of the CPA1 family with lithium:proton and potassium:proton antiporter activity, sodium:hydrogen exchanger activity, and additional NAD ADP-ribosyltransferase and protein kinase activities. The gene is associated with lithium export, sodium import, vacuolar membrane transport, cell pH regulation, and responses to salt, water, hydrogen peroxide, ozone, and superoxide. It localises to the tonoplast, vacuolar membrane, plasmalemma, and chloroplast envelope. Associations include leaf relative water content, net photosynthetic rate, transpiration rate, chlorophyll content, yield, plant height, root development and thickness, drought tolerance, salt response, high temperature stress response, disease tolerance, and abscisic acid and jasmonic acid sensitivity. Related genes in other species link the family to sodium efflux, salt stress tolerance, potassium acquisition, and ion homeostasis.