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Han, Min; Wu, Wei; Wu, Wei-Hua; Wang, Yi
Molecular Plant, 03/2016, Letnik: 9, Številka: 3Journal Article
Potassium (K^+) is one of the essential macronutrients for plant growth and development. K^+ uptake from environment and K^+ translocation in plants are conducted by K^+ channels and transporters. In this study, we demonstrated that KT/HAK/KUP transporter KUP7 plays crucial roles in K^+ uptake and translocation in Arabidopsis root. The kup7 mutant exhibited a sensitive phenotype on Iow-K^+ medium, whose leaves showed chlorosis symptoms compared with wild-type plants. Loss of function of KUP7 led to a reduction of K^+ uptake rate and K^+ content in xylem sap under W-deficient conditions. Thus, the K^+ content in kup7 shoot was significantly reduced under Iow-K^+ conditions. Localization analysis revealed that KUP7 was predominantly targeted to the plasma membrane. The complementation assay in yeast suggested that KUP7 could mediate K^+ transport. In addition, phosphorylation on S80, S719, and S721 was important for KUP7 activity. KUP7 was ubiquitously expressed in many organs/tissues, and showed a higher expression level inArabidopsis root. Together, our data demonstrated that KUP7 is crucial for K^+ uptake inArabidopsis root and might be also involved in K^+ transport into xylem sap, affecting K^+ translocation from root toward shoot, especially under K^+-Iimited conditions.
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