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Potassium (K + ) is a necessary nutrient for plant growth and crop production. The K +  transporter plays crucial roles in the absorption and transport of K +  in plants. Most K +  transporters in  Arabidopsis  have been reported, but AtKUP12, which is a member of the KT/KUP/HAK family, has not yet been the subject of relevant in-depth research. In the present study, we demonstrated that AtKUP12 plays a crucial role in K +  uptake in  Arabidopsis  under 100 μM low-K +  and 125 mM salt stress conditions.  AtKUP12  transcripts were induced by K +  deficiency and salt stress. We analyzed the K +  uptake of AtKUP12 using the K +  uptake-deficient yeast R5421 and  Arabidopsis  mutant  atkup12 . Transformation with  AtKUP12  rescued the growth defect of mutant yeast and  atkup12  mutant plants at the low-K +  concentration, which suggested that AtKUP12 might be involved in high-affinity K +  uptake in low-K +  environments. In comparison to the wild-type (WT) and  atkup12-AtKUP12  complementation lines,  atkup12  showed a dramatic reduction in potassium concentration, K + /Na +  ratio, and root and shoot growth on 12-day-old seedlings under the salt conditions; however, there was no significant difference between the complementation and WT lines. Taken together, these results demonstrate that AtKUP12 might participate in salt tolerance in  Arabidopsis  through K +  uptake and K + /Na +  homeostasis.

The Potassium Transporter AtKUP12 Enhances Tolerance to Salt Stress through the Maintenance of the K + /Na + Ratio in Arabidopsis