ArticlePlanta1995
Contrasting roles in ion transport of two K(+)-channel types in root cells of Arabidopsis thaliana.
Article in Planta, 1995. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers.
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Who cites it
33 citing papers in PubMed, 139 citations in OpenAlex.
- Reducing potassium deficiency by using sodium fertilisation.Stress biology · 2022Review
- The Dynamics of Radio-Cesium in Soils and Mechanism of Cesium Uptake Into Higher Plants: Newly Elucidated Mechanism of Cesium Uptake Into Rice Plants.Frontiers in plant science · 2020Review
- Cation Specificity of Vacuolar NHX-Type Cation/HPlant physiology · 2019Article
- Overexpression of the rice AKT1 potassium channel affects potassium nutrition and rice drought tolerance.Journal of experimental botany · 2016Article
- New roles for the GLUTAMATE RECEPTOR-LIKE 3.3, 3.5, and 3.6 genes as on/off switches of wound-induced systemic electrical signals.Plant signaling & behavior · 2016Article
- Aluminium-induced ion transport in Arabidopsis: the relationship between Al tolerance and root ion flux.Journal of experimental botany · 2010Article
- High-affinity K(+) transport in Arabidopsis: AtHAK5 and AKT1 are vital for seedling establishment and postgermination growth under low-potassium conditions.Plant physiology · 2010Article
- A root's ability to retain K+ correlates with salt tolerance in wheat.Journal of experimental botany · 2008Article
- The two-pore channel TPK1 gene encodes the vacuolar K+ conductance and plays a role in K+ homeostasis.Proceedings of the National Academy of Sciences of the United States of America · 2007Article
- Article
- A Ca(2)+ signaling pathway regulates a K(+) channel for low-K response in Arabidopsis.Proceedings of the National Academy of Sciences of the United States of America · 2006Article
- Extracellular Ca2+ ameliorates NaCl-induced K+ loss from Arabidopsis root and leaf cells by controlling plasma membrane K+ -permeable channels.Plant physiology · 2006Article
- Article
- The potassium transporter AtHAK5 functions in K(+) deprivation-induced high-affinity K(+) uptake and AKT1 K(+) channel contribution to K(+) uptake kinetics in Arabidopsis roots.Plant physiology · 2005Article
- Sodium influx and accumulation in Arabidopsis.Plant physiology · 2003Article
- Regulated expression of Arabidopsis shaker K+ channel genes involved in K+ uptake and distribution in the plant.Plant molecular biology · 2003Article
- Physical and functional interaction of the Arabidopsis K(+) channel AKT2 and phosphatase AtPP2CA.The Plant cell · 2002Article
- Sodium fluxes through nonselective cation channels in the plasma membrane of protoplasts from Arabidopsis roots.Plant physiology · 2002Article
- A mutation in the Arabidopsis KT2/KUP2 potassium transporter gene affects shoot cell expansion.The Plant cell · 2002Article
- Sodium uptake in Arabidopsis roots is regulated by cyclic nucleotides.Plant physiology · 2001Article
Corrections and comments
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Authors and funding
2 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Plant roots accumulate K+ over a range of external concentrations. Root cells have evolved at least two parallel plasma-membrane K+ transporters which operate at millimolar and micromolar external [K+]: high-affinity K+ uptake is energised by symport with H+, while low-affinity uptake is assumed to occur via ion channels. To determine the role of ion channels in low-affinity K+ uptake, a characterisation of the principal K(+)-selective ion channels in the plasma membrane of Arabidopsis thaliana (L.) Heynh. cv. Columbia roots was undertaken. Two classes of K(+)-selective channels were frequently observed: one inward (IRC) and one outward (ORC) rectifying with unitary conductances of 5 pS, 20 pS (IRCs) and 15 pS (ORC), measured in symmetrical 10 mM KCl. The dominant IRC (5 pS) and ORC (15 pS) were highly cation-selective (PCl:PK < 0.025) but less selective amongst monovalent cations (PNa:PK approximately 0.17-0.3). Both the IRC and the ORC were blocked by Ba2+, Cs+ and tetra-ethyl-ammonium, whereas 4-aminopyridine and quinidine selectively inhibited the ORC. The ORC open probability was steeply voltage-dependent and ORC activation potentials were close to the potassium equilibrium potential (EK+), enabling ORCs to conduct mainly outward, but occasionally inward, K+ current. By contrast, gating of the 5-pS IRC was weakly voltage-ependent and IRC gating was invariably restricted to membrane potentials more negative than EK+, ensuring K+ transport was always inwardly directed.(ABSTRACT TRUNCATED AT 250 WORDS)
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