Seems to be involved in regulation of potassium-sodium homeostasis (PubMed:11489190, PubMed:11959905). Seems to act as a potassium-sodium cotransporter, which mediates increased potassium uptake under external sodium accumulation and contributes to salt-tolerance in cultivar indica Pokkali (PubMed:11489190, PubMed:11959905). Induced by potassium starvation in roots. Down-regulated by sodium. HKT transporters are proposed to contain 4 pore-forming regions enclosed by transmembrane segments with each containing a potassium channel-like selectivity filter motif. Belongs to the TrkH potassium transport family. HKT (TC 2.A.38.3) subfamily. HKT2 is found in salt-tolerant cultivar indica Pokkali. It does not exist in cultivar indica 93-11 or japonica Nipponbare.