ArticlePlant physiology1991
The k/na selectivity of a cation channel in the plasma membrane of root cells does not differ in salt-tolerant and salt-sensitive wheat species.
Article in Plant physiology, 1991. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers.
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Who cites it
32 citing papers in PubMed.
- Cellular aspects of NaQuantitative plant biology · 2026Review
- Plant Salinity Stress: Many Unanswered Questions Remain.Frontiers in plant science · 2019Review
- A9C sensitive Cl⁻-accumulation in A. thaliana root cells during salt stress is controlled by internal and external calcium.Plant signaling & behavior · 2013Article
- Ion Transporters and Abiotic Stress Tolerance in Plants.ISRN molecular biology · 2012Review
- Properties of shaker-type potassium channels in higher plants.The Journal of membrane biology · 2006Review
- Opposing effects of aluminum on inward-rectifier potassium currents in bean root-tip protoplasts.The Journal of membrane biology · 2004Article
- 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
- Single-cell measurements of the contributions of cytosolic Na(+) and K(+) to salt tolerance.Plant physiology · 2003Article
- 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
- Ionic and osmotic effects of NaCl-induced inactivation of photosystems I and II in Synechococcus sp.Plant physiology · 2000Article
- 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
- 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
- Electrophysiological study with oxonol VI of passive NO3- transport by isolated plant root plasma membrane.Biophysical journal · 1999Article
- The plant cDNA LCT1 mediates the uptake of calcium and cadmium in yeast.Proceedings of the National Academy of Sciences of the United States of America · 1998Article
- A transient outward-rectifying K+ channel current down-regulated by cytosolic Ca2+ in Arabidopsis thaliana guard cells.Proceedings of the National Academy of Sciences of the United States of America · 1998Article
- 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
- Reduced Na+ uptake in the NaCl-hypersensitive sos1 mutant of Arabidopsis thaliana.Plant physiology · 1997Article
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The characteristics of cation outward rectifier channels were studied in protoplasts from wheat root (Triticum aestivum L. and Triticum turgidum L.) cells using the patch clamp technique. The cation outward rectifier channels were voltage-dependent with a single channel conductance of 32 +/- 1 picosiemens in 100 millimolar KCl. Whole-cell currents were dominated by the activity of the cation outward rectifiers. The time- and voltage-dependence of these currents was accounted for by the summed behavior of individual channels recorded from outside-out detached patches. The K(+)/Na(+) permeability ratio of these channels was measured in a salt-sensitive and salt-tolerant genotype of wheat that differ in rates of Na(+) accumulation, using a voltage ramp protocol on protoplasts in the whole-cell configuration. Permeability ratios were calculated from shifts in reversal potentials following ion substitutions. There were no significant differences in the K(+)/Na(+) permeability ratios of these channels in root cells from either of the two genotypes tested. The permeability ratio for K(+)/Cl(-) was greater than 50:1. The K(+)/Na(+) permeability ratio averaged 30:1, which is two to four times more selective than the same type of channel in guard cells and suspension culture cells. Lowering the Ca(2+) concentration in the bath solution to 0.1 millimolar in the presence of 100 millimolar Na(+) had no significant effect on the K(+)/Na(+) permeability ratios of the channel. It seems unlikely that the mechanism of salt tolerance in wheat is based on differences in the K(+)/Na(+) selectivity of these channels.
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