NHX1 (TRAESCS2B02G141900) — triticum aestivum

Summary

TRAESCS2B02G141900 (TaNHX1) on wheat chromosome 2B encodes a sodium:hydrogen exchanger with potassium:proton antiporter and sodium transporter activities, belonging to the NaH_exchanger and CPA1 cation/H+ exchanger families. The protein localizes to the vacuolar membrane, vacuole, plastid, mitochondria, and plasmalemma, and is associated with vacuolar membrane transport, sodium import, potassium ion transport, regulation of stomatal closure, C4 photosynthesis, proline and melatonin metabolism, and hydrogen sulfide anabolism. In wheat, the NHX2 family member has been linked to drought tolerance. The gene is associated with grain iron and zinc content, grain yield, harvest index, biomass yield, test weight, heading time, plant vigor, stand establishment, leaf chlorophyll content, and coleoptile length. Studies of related genes in other species link the family to potassium uptake, vacuolar pH homeostasis, cell expansion, and heat tolerance, as well as salt and drought stress responses.