NHX1 — Phaseolus vulgaris

Summary

PHAVU_006G097100, designated PvNHX1, encodes a sodium/hydrogen exchanger belonging to the CPA1 family, with potassium:proton antiporter activity and sodium transporter activity. This vacuolar membrane protein is associated with sodium and potassium ion membrane transport, vacuolar transport, cell pH regulation, and activation of the salinity response. It is linked to regulation of stomatal closure, cell expansion, root growth, flower development, and auxin homeostasis. Associations include leaf relative water content, photosynthetic rate, cell membrane stability, and salinity tolerance. Studies of related genes in other species link the family to salt tolerance, potassium accumulation, vacuolar pH homeostasis, heat and cold tolerance, seed germination, biomass production, and disease resistance.