NHX1 — Cucumis melo

Summary

MELO3C029226.2 (CmNHX1) on melon chromosome 2 encodes a cation/H⁺ exchanger of the CPA1 family with lithium:proton antiporter, potassium:proton antiporter, sodium:hydrogen exchanger and sodium transporter activities. It is associated with vacuolar membrane transport, sodium import, lithium export, potassium ion homeostasis, cell pH regulation, and response to superoxide. The gene is linked to yield, photosynthetic rate, stomatal resistance, plant height, root development, seedling growth, disease tolerance, and abiotic stress responses including high temperature stress response. It has been connected to sodium uptake, iron concentration, phosphorus uptake, auxin content, and abscisic acid sensitivity. Studies of related genes in other species link the family to ion homeostasis, vacuolar pH regulation, sodium exclusion, and stress tolerance traits including drought, heat, cold, and alkaline stress.