Membrane Depolarization by Hexacyanoferrate (III), Hexabromoiridate (IV) and Hexachloroiridate (IV)

Döring, Olaf; Lüthje, Sabine; Hilgendorf, Frank; Böttger, Michael

doi:10.1093/jxb/41.9.1055

Cited by 27 publications

(9 citation statements)

References 22 publications

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“…105, 1994 instantaneous and repolarization occurred immediately after HCF 111 remova1 (Figs. 2 and 4) and because of the high capacity of L. stoloniferum root cells for HCF I11 reduction (Grabov, 1993), we assumed that depolarization resulted from trans-plasma membrane electron transfer (Ivankina and Novak, 1988;Doring et al, 1990;Ullrich and Guem, 1990). The small change in membrane current within the range of the free-running potential may reflect the modification of electron flux evoked by HCF I11 (Figs.…”

Section: Hcf Ill-evoked Depolarization Does Not Originate From Stimulmentioning

confidence: 99%

“…Accessing the redox system with artificial electron acceptors leads to an immediate increase in net proton secretion (Federico and Giartosio, 1983;Bottger and Lüthen, 1986), an increase (Grabov et al, 1993) or decrease (Ullrich and Guem, 1990) in cytoplasmic pH, and depolarization of the plasma ~~~ ~ This work was supported by grants from Deutsrhe Forschungs-' Present address: London University, Department of Biological membrane (Ivankina and Novak, 1988;Doring et al, 1990;Ullrich and Guem, 1990;Grabov et al, 1993). The nature of the link between redox activity and proton excretion is still under debate (Novak and Ivankina, 1978;Bottger and Lü-then, 1986;Rubinstein and Stem, 1986;Ivankina andNovak, 1988, Doring et al, 1990).…”

mentioning

confidence: 99%

“…Vol. 105, 1994Doring et al, 1990Ullrich and Guem, 1990;Grabov et al, 1993). However, a modification of the K+ channels may also be responsible for this process since they are tightly involved in cell electrogenesis.…”

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confidence: 99%

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Are Redox Reactions Involved in Regulation of K+ Channels in the Plasma Membrane of Limnobium stoloniferum Root Hairs?

Grabov

Böttger

1994

Plant Physiol.

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l h e effects of the impermeant electron acceptor hexacyanoferrate 111 (HCF 111) and the potassium channel blocker tetraethylammonium (TEA) on the current-voltage relationship and electrical potential across the plasma membrane of Limnobium stoloniferum root hairs was investigated using a modified sucrose gap technique.One millimolar HCF 111 immediately and reversibly depolarized the membrane by 27 mV, whereas the effect on the trans-membrane current was markedly delayed. After 6 min of treatment with this electron acceptor, outwardly rectifying current was inhibited by 50%, whereas the inwardly rectifying current was activated approximately 3-fold. l e n millimolar TEA blocked both outward (65%) and inward (52%) currents. Differential TEA-sensitive current was shown to be blocked (55%) by HCF 111 at -20 mV and was shown to be stimulated (230%) by this electron acceptor at

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Section: Hcf Ill-evoked Depolarization Does Not Originate From Stimulmentioning

confidence: 99%

mentioning

confidence: 99%

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Are Redox Reactions Involved in Regulation of K+ Channels in the Plasma Membrane of Limnobium stoloniferum Root Hairs?

Grabov

Böttger

1994

Plant Physiol.

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“…Research on plasma membrane redox activity suggests that plant cells are able to reduce exogenous electron acceptors; hexacyanoferrate III (HCF III) is much used in such studies [5][6][7][8]. Ferricyanide reduction by plant cells is accompanied by proton release [9][10][11] and plasma membrane depolarization [12,13]. It has also been reported that plant hormones of the auxin class change the rate of HCF III reduction and proton extrusion by plant cells [14,15].…”

Section: Introductionmentioning

confidence: 99%

The effect of auxins (IAA and 4-Cl-IAA) on the redox activity and medium pH of Zea mays L. root segments

Lekacz

Karcz

2006

Cellular and Molecular Biology Letters

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Indole-3-acetic acid (IAA) and 4-chloroindole-3-acetic acid (4-Cl-IAA) were tested at different concentrations and times for their capacity to change the redox activity and medium pH of maize root segments. The doseresponse surfaces (dose-response curves as a function of time) plotted for redox activity and changes in medium pH (expressed as ΔpH) had a similar shape for both auxins, but differed significantly at the optimal concentrations. With 4-Cl-IAA, the maximal values of redox activity and medium pH changes were observed at 10 -10 M, which was a 100-fold lower concentration than with IAA. Correlations were observed between redox activity and medium pH changes at the optimal concentrations of both IAA and 4-Cl-IAA. The results are discussed herein, taking into account both the concentration of the auxins and the effects produced by them.

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“…Although NAD(P)H has been identified as a common electron donor for plasma membrane electron transport, the final acceptor is still a matter of controversy. A wide variety of electron acceptors has been applied to test and analyze the transplasmalemma electron transport (Liithje and Bottger, 1989;Doring et al, 1990). However, except for oxygen and AFR, most of these acceptors are artificial and unlikely to be present in the natural environment of the cell.…”

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confidence: 99%

Nutrient Uptake Changes in Ascorbate Free Radical-Stimulated Onion Roots

González‐Reyes¹,

Hidalgo²,

Caler³

et al. 1994

Plant Physiol.

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Long-term treatments with ascorbate free radical-stimulated glucose, fucose, sucrose, and nitrate uptake in Allium cepa roots.Clucose and fucose showed saturation kinetics in untreated roots, but after treatment with the ascorbate free radical, uptake was linear with time. Although the rates of nitrate and sucrose uptake increased after treatment with ascorbate free radical, the kinetics were similar to those observed in the controls. Ascorbate and dehydroascorbate inhibited nutrient uptake. l h e uptake rates for all nutrients increased throughout the 48-h period of pretreatment with ascorbate free radical. During the treatment an increase in the vacuole volume and tonoplast surface area also occurred. These results show the relationship between an increase in vacuolar volume and stimulated nutrient uptake from ascorbate-free radical, resulting in enhanced root elongation. These results suggest that activation of a transplasma membrane redox system by ascorbatefree radical is involved in these responses.

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Membrane Depolarization by Hexacyanoferrate (III), Hexabromoiridate (IV) and Hexachloroiridate (IV)

Cited by 27 publications

References 22 publications

Are Redox Reactions Involved in Regulation of K+ Channels in the Plasma Membrane of Limnobium stoloniferum Root Hairs?

Are Redox Reactions Involved in Regulation of K+ Channels in the Plasma Membrane of Limnobium stoloniferum Root Hairs?

The effect of auxins (IAA and 4-Cl-IAA) on the redox activity and medium pH of Zea mays L. root segments

Nutrient Uptake Changes in Ascorbate Free Radical-Stimulated Onion Roots

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