NHX1 — Brassica napus

Summary

BnNHX1 (DARMORV10_C02P57900.1) on chromosome C02 of oilseed rape 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 localization and linked to sodium and potassium ion membrane transport, vacuolar pH, cell expansion, stomatal closure, and photoprotection. It is associated with leaf relative water content, photosynthetic rate, chlorophyll content, and salinity tolerance (SALTTL). Studies of related genes in other species link the family to salt tolerance, ion homeostasis, heat and cold tolerance, seed germination, biomass production, and disease resistance. The gene is also associated with CML18 and with phenotypes including hypocotyl elongation, flower development, root growth directionality, and auxin homeostasis.