NHX1 — Phaseolus vulgaris

Summary

PHAVU_007G184100 (PvNHX1) on chromosome 7 of French bean encodes a sodium/hydrogen exchanger of the CPA1 family with potassium:proton antiporter activity. The protein localises to the vacuolar membrane and is associated with sodium and potassium ion membrane transport, cell pH regulation, and activation of the salinity response. PvNHX1 is linked to regulation of stomatal closure, cell expansion, root growth, flower development, and leaf development. It has been connected to agronomic traits including cell membrane stability, leaf relative water content, photosynthetic rate, and salinity tolerance. Studies of related genes in other species link the family to salt tolerance, potassium accumulation, ion homeostasis, and heat and cold tolerance.