ArticleJournal of experimental botany2012
A pharmacological analysis of high-affinity sodium transport in barley (Hordeum vulgare L.): a 24Na+/42K+ study.
Article in Journal of experimental botany, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.
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Who cites it
14 citing papers in PubMed.
- Effects of Combined Salt and Heat Stress on Agronomic Traits, Photosynthetic Parameters, and Physiological Biochemistry in Six Alfalfa (Plants (Basel, Switzerland) · 2025Article
- Transcriptome and Low-Affinity Sodium Transport Analysis Reveals Salt Tolerance Variations between Two Poplar Trees.International journal of molecular sciences · 2023Article
- Continuous monitoring of plant sodium transport dynamics using clinical PET.Plant methods · 2021Article
- Partial Substitution of K by Na Alleviates Drought Stress and Increases Water Use Efficiency inFrontiers in plant science · 2021Article
- Plasma-membrane electrical responses to salt and osmotic gradients contradict radiotracer kinetics, and reveal NaPlanta · 2019Article
- Membrane fluxes, bypass flows, and sodium stress in rice: the influence of silicon.Journal of experimental botany · 2018Article
- Article
- Salinity tolerance in plants. Quantitative approach to ion transport starting from halophytes and stepping to genetic and protein engineering for manipulating ion fluxes.Frontiers in plant science · 2015Review
- Functional characterization in Xenopus oocytes of Na+ transport systems from durum wheat reveals diversity among two HKT1;4 transporters.Journal of experimental botany · 2014Article
- Rapid ammonia gas transport accounts for futile transmembrane cycling under NH3/NH4+ toxicity in plant roots.Plant physiology · 2013Article
- Interaction of phenanthrene and potassium uptake by wheat roots: a mechanistic model.BMC plant biology · 2013Article
- Capacity and plasticity of potassium channels and high-affinity transporters in roots of barley and Arabidopsis.Plant physiology · 2013Article
- Plant High-Affinity Potassium (HKT) Transporters involved in salinity tolerance: structural insights to probe differences in ion selectivity.International journal of molecular sciences · 2013Review
- K+ efflux and retention in response to NaCl stress do not predict salt tolerance in contrasting genotypes of rice (Oryza sativa L.).PloS one · 2013Article
Corrections and comments
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Soil sodium, while toxic to most plants at high concentrations, can be beneficial at low concentrations, particularly when potassium is limiting. However, little is known about Na(+) uptake in this 'high-affinity' range. New information is provided here with an insight into the transport characteristics, mechanism, and ecological significance of this phenomenon. High-affinity Na(+) and K(+) fluxes were investigated using the short-lived radiotracers (24)Na and (42)K, under an extensive range of measuring conditions (variations in external sodium, and in nutritional and pharmacological agents). This work was supported by electrophysiological, compartmental, and growth analyses. Na(+) uptake was extremely sensitive to all treatments, displaying properties of high-affinity K(+) transporters, K(+) channels, animal Na(+) channels, and non-selective cation channels. K(+), NH(4)(+), and Ca(2+) suppressed Na(+) transport biphasically, yielding IC(50) values of 30, 10, and <5 μM, respectively. Reciprocal experiments showed that K(+) influx is neither inhibited nor stimulated by Na(+). Sodium efflux constituted 65% of influx, indicating a futile cycle. The thermodynamic feasibility of passive channel mediation is supported by compartmentation and electrophysiological data. Our study complements recent advances in the molecular biology of high-affinity Na(+) transport by uncovering new physiological foundations for this transport phenomenon, while questioning its ecological relevance.
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