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• W2148598400 startingPage "2479" @default.
• W2148598400 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." @default.
• W2148598400 created "2016-06-24" @default.
• W2148598400 creator A5013093953 @default.
• W2148598400 creator A5065099673 @default.
• W2148598400 creator A5065165313 @default.
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• W2148598400 date "2012-01-20" @default.
• W2148598400 modified "2023-10-02" @default.
• W2148598400 title "A pharmacological analysis of high-affinity sodium transport in barley (Hordeum vulgare L.): a 24Na+/42K+ study" @default.
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• W2148598400 doi "https://doi.org/10.1093/jxb/err419" @default.
• W2148598400 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3346217" @default.
• W2148598400 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22268152" @default.
• W2148598400 hasPublicationYear "2012" @default.
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