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

AuthorsLi, Hong; Du, Xin-Qiao; Wang, Zi-Fhang; Wu, Wei-Ha; Quintero, Francisco J. ; Jin, Xue-Hua; Li, Hao-Dong; Wang, Yi
Issue Date2017
PublisherAmerican Society of Plant Biologists
CitationPlant Cell, 29: 2016–2026 (2017)
AbstractPotassium 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 NO3 2 are correlated with each other in plants; however, the molecular mechanism that coordinates K+ and NO3 2 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 NO3 2 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+/NO3 2 distribution in plants
Publisher version (URL)http://www.plantcell.org/cgi/doi/10.1105/tpc.16.00972
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