ArticleThe Journal of membrane biology1994
Pump and K+ inward rectifiers in the plasmalemma of wheat root protoplasts.
Article in The Journal of membrane biology, 1994. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.
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Who cites it
18 citing papers in PubMed.
- Properties of shaker-type potassium channels in higher plants.The Journal of membrane biology · 2006Review
- Article
- Differences in whole-cell and single-channel ion currents across the plasma membrane of mesophyll cells from two closely related Thlaspi species.Plant physiology · 2003Article
- Dominant negative guard cell K+ channel mutants reduce inward-rectifying K+ currents and light-induced stomatal opening in arabidopsis.Plant physiology · 2001Article
- Malate-permeable channels and cation channels activated by aluminum in the apical cells of wheat roots.Plant physiology · 2001Article
- A patch-clamp study on the physiology of aluminum toxicity and aluminum tolerance in maize. Identification and characterization of Al(3+)-induced anion channels.Plant physiology · 2001Article
- Enhancement of Na(+) uptake currents, time-dependent inward-rectifying K(+) channel currents, and K(+) channel transcripts by K(+) starvation in wheat root cells.Plant physiology · 2000Article
- Differential ion accumulation and ion fluxes in the mesophyll and epidermis of barley.Plant physiology · 2000Article
- A weakly voltage-dependent, nonselective cation channel mediates toxic sodium influx in wheat.Plant physiology · 2000Article
- Inhibition of water channels by HgCl2 in intact wheat root cellsPlant physiology · 1999Article
- Expression of a Cs(+)-resistant guard cell K+ channel confers Cs(+)-resistant, light-induced stomatal opening in transgenic arabidopsis.The Plant cell · 1997Article
- Roles of higher plant K+ channels.Plant physiology · 1997Review
- Aluminum activates an anion channel in the apical cells of wheat roots.Proceedings of the National Academy of Sciences of the United States of America · 1997Article
- Direct influence of the sodium pump on the membrane potential of vomeronasal chemoreceptor neurones in frog.The Journal of physiology · 1996Article
- Contrasting roles in ion transport of two K(+)-channel types in root cells of Arabidopsis thaliana.Planta · 1995Article
- Green circuits--the potential of plant specific ion channels.Plant molecular biology · 1994Review
- Ion channels in the plasma membrane of protoplasts from the halophytic angiosperm Zostera muelleri.The Journal of membrane biology · 1994Article
- Properties of the K+ inward rectifier in the plasma membrane of xylem parenchyma cells from barley roots: effects of TEA+, Ca2+, Ba2+ and La3+.The Journal of membrane biology · 1994Article
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Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
An electrogenic pump, a slowly activating K+ inward rectifier and an intermittent, "spiky," K+ inward rectifier, have been identified in the plasmalemma of whole protoplasts from root cortical cells of wheat (Triticum) by the use of patch clamping techniques. Even with high external concentrations of K+ of 100 mM, the pump can maintain the membrane potential difference (PD) down to -180mV, more negative than the electrochemical equilibrium potentials of the various ions in the system. The slowly activating K+ inward rectifier, apparent in about 23% of protoplasts, allows inward current flow when the membrane PD becomes more negative than the electrochemical equilibrium potential for K+ by about 50 mV. The current usually consists of two exponentially rising components, the time constant of one about 10 times greater than the other. The longer time constant is voltage dependent, while the smaller time constant shows little voltage dependence. The rectifier deactivates, on return of the PD to less negative levels, with a single exponential time course, whose time constant is strongly voltage dependent. The spiky K+ inward rectifier, present in about 68% of protoplasts, allows intermittent current, of considerable magnitude, through the plasmalemma at PDs usually more negative than about -140mV. Patch clamp experiments on detached outside-out patches show that a possibly multi-state K+ channel, with maximum conductance greater than 400 pS, may constitute this rectifier. The paper also considers the role of the pump and the K+ inward rectifiers in physiological processes in the cell.
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