NHX1 — Brassica napus

Summary

BnNHX1 (DARMORV10_A02P38520.1) on chromosome A02 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 is 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 has been associated with leaf relative water content, photosynthetic rate, chlorophyll content, and salt tolerance. Associations also include hypocotyl elongation, cell expansion, flower development, root growth, stem internode length, auxin homeostasis, nitrogen assimilation, fiber yield, stomatal regulation, gravitropism, and apical dominance. Studies of related genes in other species link the family to salt tolerance, potassium uptake, pH homeostasis, heat and cold tolerance, seed germination, biomass production, and disease resistance.