NHX1 — Cicer arietinum

Summary

NHX1 (PsNHX5) on chickpea chromosome 1LG6 encodes a sodium/hydrogen exchanger with potassium:proton antiporter activity and calmodulin binding. It is associated with vacuolar membrane transport, sodium import, cell pH regulation, activation of salinity response, and regulation of stomatal closure. The gene has been connected to drought tolerance, photosynthetic rate, leaf relative water content, chlorophyll content, root length, flavonoid content, and stem internode morphology. Localisation evidence links it to the vacuolar membrane, plasmalemma, plastid, and mitochondria. Related genes in other species link it to salt tolerance, potassium uptake, vacuolar pH homeostasis, heat tolerance, cold tolerance, seed germination rate, biomass production, and disease resistance.