NHX1 — Brassica juncea

Summary

BJUA06G09960S (NHX1) on chromosome A06 of Indian mustard (Brassica juncea) encodes a protein belonging to the cation/H+ exchanger CPA1 family, with potassium:proton antiporter activity and sodium:hydrogen exchanger activity. The product is localized to the vacuolar membrane and plasmalemma. NHX1 is associated with vacuolar membrane transport, sodium import, cell pH regulation, potassium ion membrane transport, photoprotection, detoxification, calcium signaling, chlorophyll fluorescence, response to stress, homeostasis, and activation of salinity response. It has been linked to chlorophyll content and salt tolerance (SALTTL). Studies of related genes in other species connect the NHX1 family to ion homeostasis and salt stress responses, though these specific associations are not yet established in Indian mustard.