ArticlePlant physiology2015
Nitrate-Dependent Control of Shoot K Homeostasis by the Nitrate Transporter1/Peptide Transporter Family Member NPF7.3/NRT1.5 and the Stelar K+ Outward Rectifier SKOR in Arabidopsis.
Article in Plant physiology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 58 papers.
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58 citing papers in PubMed, 101 citations in OpenAlex.
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- Functional characterization of NRT1/PTR FAMILY transporters: looking for a needle in a haystack.The New phytologist · 2026Review
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- Homeostasis of ammonium and nitrate in plants.Quantitative plant biology · 2026Review
- PcNPF2.7 from the XerophyteBiology · 2025Article
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- Natural variation in potassium deficiency responses among Arabidopsis thaliana accessions.Plant & cell physiology · 2025Article
- Potassium extrusion by plant cells: evolution from an emergency valve to a driver of long-distance transport.The New phytologist · 2025Review
- Potassium homeostasis and signalling: from the whole plant to the subcellular level.Quantitative plant biology · 2025Review
- Characterization of the wall-associated kinase (WAK) gene family in Gossypium barbadense reveals the positive role of GbWAK5 in salt tolerance.Plant cell reports · 2024Article
- Wild species riceMolecular breeding : new strategies in plant improvement · 2024Article
- The Molecular Mechanism of Potassium Absorption, Transport, and Utilization in Rice.International journal of molecular sciences · 2023Review
- Physiological and Transcriptional Analyses Provide Insight into Maintaining Ion Homeostasis of Sweet Sorghum under Salt Stress.International journal of molecular sciences · 2023Article
- The anion channel SLAH3 interacts with potassium channels to regulate nitrogen-potassium homeostasis and the membrane potential in Arabidopsis.The Plant cell · 2023Article
- Genome-Wide Identification and Expression Analysis ofPlants (Basel, Switzerland) · 2023Article
- Xylem KFrontiers in plant science · 2023Article
- The KFrontiers in plant science · 2023Article
- Does Potassium (KInternational journal of molecular sciences · 2022Review
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Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Root-to-shoot translocation and shoot homeostasis of potassium (K) determine nutrient balance, growth, and stress tolerance of vascular plants. To maintain the cation-anion balance, xylem loading of K(+) in the roots relies on the concomitant loading of counteranions, like nitrate (NO3 (-)). However, the coregulation of these loading steps is unclear. Here, we show that the bidirectional, low-affinity Nitrate Transporter1 (NRT1)/Peptide Transporter (PTR) family member NPF7.3/NRT1.5 is important for the NO3 (-)-dependent K(+) translocation in Arabidopsis (Arabidopsis thaliana). Lack of NPF7.3/NRT1.5 resulted in K deficiency in shoots under low NO3 (-) nutrition, whereas the root elemental composition was unchanged. Gene expression data corroborated K deficiency in the nrt1.5-5 shoot, whereas the root responded with a differential expression of genes involved in cation-anion balance. A grafting experiment confirmed that the presence of NPF7.3/NRT1.5 in the root is a prerequisite for proper root-to-shoot translocation of K(+) under low NO3 (-) supply. Because the depolarization-activated Stelar K(+) Outward Rectifier (SKOR) has previously been described as a major contributor for root-to-shoot translocation of K(+) in Arabidopsis, we addressed the hypothesis that NPF7.3/NRT1.5-mediated NO3 (-) translocation might affect xylem loading and root-to-shoot K(+) translocation through SKOR. Indeed, growth of nrt1.5-5 and skor-2 single and double mutants under different K/NO3 (-) regimes revealed that both proteins contribute to K(+) translocation from root to shoot. SKOR activity dominates under high NO3 (-) and low K(+) supply, whereas NPF7.3/NRT1.5 is required under low NO3 (-) availability. This study unravels nutritional conditions as a critical factor for the joint activity of SKOR and NPF7.3/NRT1.5 for shoot K homeostasis.
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