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Título: | The Arabidopsis protein NPF6.2/NRT1.4 is a plasma membrane nitrate transporter and a target of protein kinase CIPK23 |
Autor: | Morales de los Ríos, Laura; Corratgé-Faillie, Claire; Raddatz, Natalia CSIC ORCID; Mendoza, Imelda CSIC ORCID; Lindahl, Marika CSIC ORCID ; Angeli, Alexis de; Lacombe, Benoît; Quintero, Francisco J. CSIC ORCID ; Pardo, José M. CSIC ORCID | Palabras clave: | Plant nutrition Nitrate Potassium Ion transport Arabidopsis |
Fecha de publicación: | 2021 | Editor: | Elsevier | Citación: | Plant Physiology and Biochemistry, 168: 239-251 (2021) | Resumen: | Nitrate and potassium nutrition is tightly coordinated in vascular plants. Physiological and molecular genetics studies have demonstrated that several NPF/NRT1 nitrate transporters have a significant impact on both uptake and the root-shoot partition of these nutrients. However, how these traits are biochemically connected remain controversial since some NPF proteins, e.g. NPF7.3/NRT1.5, have been suggested to mediate K+/H+ exchange instead of nitrate fluxes. Here we show that NPF6.2/NRT1.4, a protein that gates nitrate accumulation at the leaf petiole of Arabidopsis thaliana, also affects the root/shoot distribution of potassium. We demonstrate that NPF6.2/NRT1.4 is a plasma membrane nitrate transporter phosphorylated at threonine-98 by the CIPK23 protein kinase that is a regulatory hub for nitrogen and potassium nutrition. Heterologous expression of NPF6.2/NRT1.4 and NPF7.3/NRT1.5 in yeast mutants with altered potassium uptake and efflux systems showed no evidence of nitrate-dependent potassium transport by these proteins | URI: | http://hdl.handle.net/10261/252738 | DOI: | 10.1016/j.plaphy.2021.10.016 |
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