NHX1 — Triticum aestivum

Summary

TRAESCS4B02G125700 (TaNHX1) on wheat chromosome 4B encodes a cation/H+ exchanger transmembrane domain-containing protein with sodium:hydrogen exchanger, potassium:proton antiporter and sodium transporter activities. It is associated with vacuolar membrane localisation and linked to sodium import, potassium ion transport, regulation of stomatal closure, activation of salinity response, and hydrogen sulfide and melatonin anabolism. TaNHX1 has been connected to drought tolerance in wheat, as well as to grain yield, days to heading, leaf chlorophyll content, net photosynthetic rate, proline content, stomatal resistance and salinity tolerance. Studies of related genes in other species link the family to potassium uptake, vacuolar pH homeostasis, ion homeostasis, heat tolerance, salt stress tolerance, drought resistance and yield.