Redox Activity and Alcohol-mediated Energization of the Plasma Membrane of Plant Cells

Dahse, I.; Petzold, U.; Bernstein, Matthias

doi:10.1016/s0176-1617(11)81156-9

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Most of the energy for anoxic elongation of arrowhead shoots is produced by ethanol fermentation (Ishizawa et al, 1999;Sato et al, 2002). Effects of pyrazol, an inhibitor of alcohol dehydrogenase (Dahse et al, 1994), on shoot elongation under various conditions of treatment with a combination of the three gases were examined (Table 2). Pyrazol significantly inhibited elongation at 1 % O 2 regardless of the presence or absence of either CO 2 or ethylene, or both.…”

Section: Effects Of Pyrazol Avg and 1-mcp On Shoot Elongationmentioning

confidence: 99%

Expression of α-Expansin and Xyloglucan Endotransglucosylase/Hydrolase Genes Associated with Shoot Elongation Enhanced by Anoxia, Ethylene and Carbon Dioxide in Arrowhead (Sagittaria pygmaea Miq.) Tubers

Ookawara

Satoh²,

Yoshioka³

et al. 2005

Annals of Botany

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In air, promotion by 5% CO2 and 5 microL L-1 ethylene of shoot elongation occurred. At 1% O2, ethylene also stimulated shoot elongation but CO2 did not. Pyrazol inhibited shoot elongation in hypoxia but not in normoxia, suggesting that alcohol fermentation contributes to elongation enhanced by hypoxia. AVG and 1-MCP partially prevented shoot elongation both in normoxia and in hypoxia, but they did not have significant effects in anoxia, suggesting that endogenous ethylene acts as a stimulator of shoot elongation in normoxia and in hypoxia but not in anoxia. Ethylene is not involved in anoxia-enhanced elongation. We cloned four cDNAs (SpEXPA1, 2, 3 and 4) encoding alpha-expansin (EXPA) and five cDNAs (SpXTH1, 2, 3, 4 and 5) encoding xyloglucan endotransglucosylase/hydrolase (XTH) from shoots of arrowhead tubers. The transcript levels of SpEXPA1 and 2 were increased by anoxia and those of SpEXPA2 were increased by 5% CO2. Ethylene slightly elevated the level of SpEXPA4 transcripts. Anoxia enhanced the transcript levels of SpXTH1 and 4; neither ethylene nor CO2 had any effect. CO2 enhanced transcript levels of SpXTH3 and depressed those of SpXTH5. Ethylene decreased transcript levels of SpXTH5. These results suggest that four SpEXPA genes and five SpXTH genes are differently responsive to anoxia, CO2 and ethylene. Enhancement of SpEXPA1 and 2, and SpXTH1 and 4 transcript levels suggests that these gene products are involved in anoxic shoot elongation through modification of cell wall architecture.

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Section: Effects Of Pyrazol Avg and 1-mcp On Shoot Elongationmentioning

confidence: 99%

Expression of α-Expansin and Xyloglucan Endotransglucosylase/Hydrolase Genes Associated with Shoot Elongation Enhanced by Anoxia, Ethylene and Carbon Dioxide in Arrowhead (Sagittaria pygmaea Miq.) Tubers

Ookawara

Satoh²,

Yoshioka³

et al. 2005

Annals of Botany

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“…by fusicoccin) or indirect (e.g. by light, glucose or ethanol) activation of the H + -ATPase has been shown to increase ferricyanide reduction (Federico & Giartosio, 1983 ;Lass et al, 1986 ;Dahse et al, 1994 ;Marre! et al, 1994).…”

Section: The Membrane Level : Transmembrane Potential and Charge Compmentioning

confidence: 99%

“…By contrast, the reduction of ferricyanide is practically unaffected by these treatments (Federico & Giartosio, 1983 ;Revis & Misra, 1986 ;Szabo! -Nagy & Erdei, 1993 ;Dahse et al, 1994 ;Schmidt, 1995) and proceeds without H + extrusion when the production of ATP via oxidative phosphorylation is inhibited (Ullrich & Guern, 1990).…”

Section: The Membrane Level : Transmembrane Potential and Charge Compmentioning

confidence: 99%

Mechanisms and regulation of reduction‐based iron uptake in plants

1999

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Despite the usually high abundance of iron (Fe) in soils, the low solubility of Fe-bearing minerals restricts the available Fe pools in most aerobic soils to levels that are far below those required for microbial or plant growth. To acquire the necessary amounts of Fe from the environment, organisms have evolved mechanisms that enhance the solubility and dissolution rate of Fe() oxyhydroxides prevailing in aerobic soils. Chemically, these mechanisms are based on weakening of the Fe$O bond by reduction, chelation and protonation. Physiologically, two distinct and in all known cases mutually exclusive strategies can be distinguished : the excretion of siderophores capable of solubilizing external ferric Fe and subsequent uptake of the ferric siderophore complex ; and reduction of Fe() prior to uptake of the more soluble Fe# + ion. With the exception of graminaceous species, in which Fe uptake is based on the former mechanism, the latter strategy is found in all cormophytes and certain algae, yeast and bacteria. In higher plants, the increase in their capacity to convert extracellular ferric to ferrous Fe is part of a series of physiological and morphological events that act in concert to achieve appropriate internal levels of Fe. It is this amalgam of features that determines the Fe efficiency of a species or cultivar that in turn affects the yield of economically important plants and the natural distribution of species. Adaptive changes to limited Fe availability have been studied at the molecular, physiological and whole-plant level. This review summarises current knowledge of the components of reduction-based Fe uptake in plants and presents an integrated view of the present understanding of mechanisms that control the rate and extent of Fe absorption by roots.

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Extracellular ascorbate stabilization as a result of transplasma electron transfer inSaccharomyces cerevisiae

Santos-Ocaña

Navas

Crane

et al. 1995

J Bioenerg Biomembr

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The presence of yeast cells in the incubation medium prevents the oxidation of ascrobate catalyzed by copper ions. Ethanol increases ascorbate retention. Pyrazole, an alcohol dehydrogenase inhibitor, prevents ascorbate stabilization by cells. Chelation of copper ions does not account for stabilization, since oxidation rates with broken or boiled cells or conditioned media are similar to control rates in the absence of cells. Protoplast integrity is needed to reach optimal values of stabilization. Chloroquine, a known inhibitor of plasma membrane redox systems, inhibits the ascorbate stabilization, the inhibition being partially reversed by coenzyme Q6. Chloroquine does not inhibit ferricyanide reduction. Growth of yeast in iron-deficient media to increase ferric ion reductase activity also increases the stabilization. In conclusion, extracellular ascorbate stabilization by yeast cells can reflect a coenzyme Q dependent transplasmalemma electron transfer which uses NADH as electron donor. Iron deficiency increases the ascorbate stabilization but the transmembrane ferricyanide reduction system can act independently of ascorbate stabilization.

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Redox Activity and Alcohol-mediated Energization of the Plasma Membrane of Plant Cells

Cited by 5 publications

References 13 publications

Expression of α-Expansin and Xyloglucan Endotransglucosylase/Hydrolase Genes Associated with Shoot Elongation Enhanced by Anoxia, Ethylene and Carbon Dioxide in Arrowhead (Sagittaria pygmaea Miq.) Tubers

Expression of α-Expansin and Xyloglucan Endotransglucosylase/Hydrolase Genes Associated with Shoot Elongation Enhanced by Anoxia, Ethylene and Carbon Dioxide in Arrowhead (Sagittaria pygmaea Miq.) Tubers

Mechanisms and regulation of reduction‐based iron uptake in plants

Extracellular ascorbate stabilization as a result of transplasma electron transfer inSaccharomyces cerevisiae

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