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Potassium and nitrogen are essential macronutrients for plant growth and have a positive impact on crop yield. Previous studies have indicated that the absorption and translocation of K + and NO 3  - are correlated with each other in plants; however, the molecular mechanism that coordinates K + and NO 3  - transport remains unknown. In this study, using a forward genetic approach, we isolated a low-K + -sensitive Arabidopsis thaliana mutant, lks2 , that showed a leaf chlorosis phenotype under low-K + conditions. LKS2 encodes the transporter NRT1.5/NPF7.3, a member of the NRT1/PTR (Nitrate Transporter 1/Peptide Transporter) family. The lks2 / nrt1.5 mutants exhibit a remarkable defect in both K + and NO 3  - translocation from root to shoot, especially under low-K + conditions. This study demonstrates that LKS2 (NRT1.5) functions as a proton-coupled H + /K + antiporter. Proton gradient can promote NRT1.5-mediated K + release out of root parenchyma cells and facilitate K + loading into the xylem. This study reveals that NRT1.5 plays a crucial role in K + translocation from root to shoot and is also involved in the coordination of K + /NO 3  - distribution in plants.

NRT1.5/NPF7.3 Functions as a Proton-Coupled H+/K+ Antiporter for K+ Loading into the Xylem in Arabidopsis

NRT1.5/NPF7.3 Functions as a Proton-Coupled H⁺/K⁺ Antiporter for K⁺ Loading into the Xylem in Arabidopsis