ArticlePlant physiology2013
Capacity and plasticity of potassium channels and high-affinity transporters in roots of barley and Arabidopsis.
Article in Plant physiology, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.
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Who cites it
21 citing papers in PubMed, 65 citations in OpenAlex.
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- Ammonium Accumulation Caused by Reduced Tonoplast V-ATPase Activity inInternational journal of molecular sciences · 2020Article
- Salt tolerance and exclusion in the mangrove plant Avicennia marina in relation to root apoplastic barriers.Ecotoxicology (London, England) · 2020Article
- The intersection of nitrogen nutrition and water use in plants: new paths toward improved crop productivity.Journal of experimental botany · 2020Review
- Multiple High-Affinity KPlants (Basel, Switzerland) · 2020Article
- Targeting Root Ion Uptake Kinetics to Increase Plant Productivity and Nutrient Use Efficiency.Plant physiology · 2020Review
- Potassium in Root Growth and Development.Plants (Basel, Switzerland) · 2019Review
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- Genome-Wide Identification and Analysis of HAK/KUP/KT Potassium Transporters Gene Family in Wheat (International journal of molecular sciences · 2018Article
- Time-Course of Metabolic and Proteomic Responses to Different Nitrate/Ammonium Availabilities in Roots and Leaves of Maize.International journal of molecular sciences · 2018Article
- The Role of Silicon in Higher Plants under Salinity and Drought Stress.Frontiers in plant science · 2016Review
- Comparison between Arabidopsis and Rice for Main Pathways of K(+) and Na(+) Uptake by Roots.Frontiers in plant science · 2016Review
- The Emergence of 2-Oxoglutarate as a Master Regulator Metabolite.Microbiology and molecular biology reviews : MMBR · 2015Review
- Model of Cation Transportation Mediated by High-Affinity Potassium Transporters (HKTs) in Higher Plants.Biological procedures online · 2015Article
- The role of a potassium transporter OsHAK5 in potassium acquisition and transport from roots to shoots in rice at low potassium supply levels.Plant physiology · 2014Article
- Measuring fluxes of mineral nutrients and toxicants in plants with radioactive tracers.Journal of visualized experiments : JoVE · 2014Article
- Article
- Rapid ammonia gas transport accounts for futile transmembrane cycling under NH3/NH4+ toxicity in plant roots.Plant physiology · 2013Article
Corrections and comments
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The role of potassium (K(+)) transporters in high- and low-affinity K(+) uptake was examined in roots of intact barley (Hordeum vulgare) and Arabidopsis (Arabidopsis thaliana) plants by use of (42)K radiotracing, electrophysiology, pharmacology, and mutant analysis. Comparisons were made between results from barley and five genotypes of Arabidopsis, including single and double knockout mutants for the high-affinity transporter, AtHAK5, and the Shaker-type channel, AtAKT1. In Arabidopsis, steady-state K(+) influx at low external K(+) concentration ([K(+)]ext = 22.5 µm) was predominantly mediated by AtAKT1 when high-affinity transport was inhibited by ammonium, whereas in barley, by contrast, K(+) channels could not operate below 100 µm. Withdrawal of ammonium resulted in an immediate and dramatic stimulation of K(+) influx in barley, indicating a shift from active to passive K(+) uptake at low [K(+)]ext and yielding fluxes as high as 36 µmol g (root fresh weight)(-1) h(-1) at 5 mm [K(+)]ext, among the highest transporter-mediated K(+) fluxes hitherto reported. This ammonium-withdrawal effect was also established in all Arabidopsis lines (the wild types, atakt1, athak5, and athak5 atakt1) at low [K(+)]ext, revealing the concerted involvement of several transport systems. The ammonium-withdrawal effect coincided with a suppression of K(+) efflux and a significant hyperpolarization of the plasma membrane in all genotypes except athak5 atakt1, could be sustained over 24 h, and resulted in increased tissue K(+) accumulation. We discuss key differences and similarities in K(+) acquisition between two important model systems and reveal novel aspects of K(+) transport in planta.
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