NHX1 — Brassica napus

Summary

BnNHX1 (DARMORV10_A09P05150.1) on chromosome A09 of oilseed rape encodes a sodium/hydrogen exchanger belonging to the NaH_exchanger and CPA1 cation/H+ exchanger families, with potassium:proton antiporter activity, sodium transporter activity and protein binding. The gene is associated with vacuolar membrane localisation and linked to sodium and potassium ion membrane transport, vacuolar membrane transport, cell pH regulation, photoprotection, regulation of stomatal closure, chlorophyll fluorescence, and dicarboxylate metabolism. It is associated with leaf relative water content, photosynthetic rate, chlorophyll content, and salinity tolerance (SALTTL), as well as phenotypes including hypocotyl elongation, cell expansion, flower development, vacuolar pH, root growth directionality, stem internode length, auxin homeostasis, nitrogen assimilation, fiber yield, and stomatal regulation. 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.