NHX1 — Solanum lycopersicum

Summary

SOLYC01G067710.3 (NHX1) on tomato chromosome 1 encodes a sodium:hydrogen exchanger belonging to the NaH_exchanger and cation/H_exchanger_CPA1 families, with lithium:proton and potassium:proton antiporter activities. In tomato, NHX1 is associated with ionic balance, ion homeostasis, cadmium tolerance, alkaline stress tolerance, bacterial wilt resistance, and saline-alkali stress resistance. It is linked to vacuolar membrane transport, sodium import, lithium export, cell pH regulation, and potassium ion membrane transport, and localises to the tonoplast, vacuole, endosome, and plastid. Associations include sepal length, sodium uptake, lycopene content, fruit weight, yield, net photosynthetic rate, water use efficiency, and sugar content. Related genes in other species link the family to vacuolar pH homeostasis, potassium accumulation, and heat and salt stress tolerance.