ArticleJournal of experimental botany2008
Non-reciprocal interactions between K+ and Na+ ions in barley (Hordeum vulgare L.).
Article in Journal of experimental botany, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed, 60 citations in OpenAlex.
- Advances in studies on ion transporters involved in salt tolerance and breeding crop cultivars with high salt tolerance.Journal of Zhejiang University. Science. B · 2020Review
- The HKT Transporter HvHKT1;5 Negatively Regulates Salt Tolerance.Plant physiology · 2020Article
- A Comprehensive Biophysical Model of Ion and Water Transport in Plant Roots. III. Quantifying the Energy Costs of Ion Transport in Salt-Stressed Roots ofFrontiers in plant science · 2020Article
- Mass-producible disposable needle-type ion-selective electrodes for plant research.RSC advances · 2019Article
- The ability to regulate voltage-gated K+-permeable channels in the mature root epidermis is essential for waterlogging tolerance in barley.Journal of experimental botany · 2018Article
- Production of Low-Potassium Content Melon Through Hydroponic Nutrient Management Using Perlite Substrate.Frontiers in plant science · 2018Article
- Comparison between Arabidopsis and Rice for Main Pathways of K(+) and Na(+) Uptake by Roots.Frontiers in plant science · 2016Review
- Evaluation of salinity tolerance and analysis of allelic function of HvHKT1 and HvHKT2 in Tibetan wild barley.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2011Article
- Comparative physiology of elemental distributions in plants.Annals of botany · 2010Review
- Futile Na+ cycling at the root plasma membrane in rice (Oryza sativa L.): kinetics, energetics, and relationship to salinity tolerance.Journal of experimental botany · 2008Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The interaction of sodium and potassium ions in the context of the primary entry of Na(+) into plant cells, and the subsequent development of sodium toxicity, has been the subject of much recent attention. In the present study, the technique of compartmental analysis with the radiotracers (42)K(+) and (24)Na(+) was applied in intact seedlings of barley (Hordeum vulgare L.) to test the hypothesis that elevated levels of K(+) in the growth medium will reduce both rapid, futile Na(+) cycling at the plasma membrane, and Na(+) build-up in the cytosol of root cells, under saline conditions (100 mM NaCl). We reject this hypothesis, showing that, over a wide (400-fold) range of K(+) supply, K(+) neither reduces the primary fluxes of Na(+) at the root plasma membrane nor suppresses Na(+) accumulation in the cytosol. By contrast, 100 mM NaCl suppressed the cytosolic K(+) pool by 47-73%, and also substantially decreased low-affinity K(+) transport across the plasma membrane. We confirm that the cytosolic [K(+)]:[Na(+)] ratio is a poor predictor of growth performance under saline conditions, while a good correlation is seen between growth and the tissue ratios of the two ions. The data provide insight into the mechanisms that mediate the toxic influx of sodium across the root plasma membrane under salinity stress, demonstrating that, in the glycophyte barley, K(+) and Na(+) are unlikely to share a common low-affinity pathway for entry into the plant cell.
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