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A pharmacological analysis of high-affinity sodium transport in barley (Hordeum vulgare L.): a 24Na+/42K+ study
- Source :
- Journal of Experimental Botany
- Publication Year :
- 2012
- Publisher :
- Oxford University Press (OUP), 2012.
-
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
- Subjects :
- 0106 biological sciences
Physiology
Sodium
Potassium
Potassium Radioisotopes
chemistry.chemical_element
Plant Science
01 natural sciences
high-affinity Na+ uptake
salinity
ion transport
03 medical and health sciences
chemistry.chemical_compound
Barley
compartmental analysis
Ammonium
sodium
Ion transporter
030304 developmental biology
0303 health sciences
Sodium Radioisotopes
Futile cycle
Chemistry
potassium
Biological Transport
Hordeum
electrophysiology
Research Papers
radiotracers
Kinetics
Biochemistry
Biophysics
Hordeum vulgare
Efflux
pharmacology
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14602431 and 00220957
- Volume :
- 63
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany
- Accession number :
- edsair.doi.dedup.....75cb78bd6cb331c5634a78e6a7c3e1fc