NHX1 — Brassica juncea

Summary

BJUA05G35380S (BjNHX4, NHX1) encodes a sodium/hydrogen exchanger belonging to the CPA1 family of cation/proton antiporters, with potassium:proton antiporter activity and sodium transporter activity. The protein localizes to the vacuolar membrane and plant-type vacuole, and is associated with vacuolar membrane transport, sodium import, cell pH regulation, potassium ion membrane transport, photoprotection, detoxification, calcium signaling, chlorophyll fluorescence, stress response, homeostasis, and activation of salinity response. This Indian mustard gene on chromosome A05 has been connected to salt tolerance, chlorophyll content, auxin homeostasis, root growth, gravitropism, potassium ion homeostasis, microtubule organization, root growth directionality, plant growth, and apical dominance. Related genes in other species link the family to ion homeostasis, increased sensitivity to oryzalin, and shortened roots.