Organic acids reduce aluminum toxicity in maize root membranes

Suhayda, Charles G.; Haug, A.

doi:10.1111/j.1399-3054.1986.tb01913.x

Cited by 109 publications

(45 citation statements)

References 30 publications

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“…Low-molecular-weight organic acids can occur in higher than millimolar concentrations during microbial processes and in root exudates [3,4]. The presence of low-molecular-weight organic acids can not only improve mineral nutrient availability for plants and detoxify Al 3+ and possibly other toxic ions in soils, but also enhances the weathering of soil minerals [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Dissolution of kaolinite induced by citric, oxalic, and malic acids

Wang

Hu³

et al. 2005

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Dissolution of kaolinite induced by citric, oxalic, and malic acids

Wang

Hu³

et al. 2005

Journal of Colloid and Interface Science

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“…Vierstra and Haug (29) using electron paramagnetic resonance spectroscopy showed that Al decreased membrane lipid fluidity and increased the temperature for the phase change to the gel state in isolated and intact cell membranes of Thermoplasma acidophilum. Reduction of membrane lipid mobility by Al was also observed in root plasma membrane-enriched microsomal fractions of Zea mays (27). Pettersson et al (20) 'Abbreviations: Al, aluminum; Ea, activation energy; EU, monoethyl urea; K, permeability constants of water, urea, and EU; Ks, permeability constant of urea or EU; K, permeability constant of water; Pc, partition coefficient.…”

mentioning

confidence: 99%

“…Al bound to calmodulin and reduced calmodulinrelated transmembrane potential in plasma membrane-enriched barley root vesicles (24). Al produced calmodulin conformational changes in the plasma membrane-enriched microsomal fraction of Zea mays root (27). Al, 10 to 50 ,uM, induced a decrease in Mg2'-ATPase activity (23).…”

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confidence: 99%

Aluminum and Temperature Alteration of Cell Membrane Permeability of Quercus rubra

Chen¹,

Sucoff²,

Stadelmann³

1991

Plant Physiol.

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This report extends research on Al-induced changes in membrane behavior of intact root cortex cells of Northern red oak (Quercus rubra). Membrane permeability was determined by the plasmometric method for individual intact cells at temperatures from 2 or 4 to 35°C. Al (0.37 millimolar) significantly increased membrane permeability to urea and monoethyl urea and decreased permeability to water. Al significantly altered the activation energy required to transport water (+32%), urea (+9%), and monoethyl urea (-7%) across cell membranes. Above 90C, Al increased the lipid partiality of the cell membranes; below 70C, Al decreased it. Al narrowed by 60C the temperature range over which plasmolysis occurred without membrane damage. These changes in membrane behavior are explainable if Al reduces membrane lipid fluidity and kink frequency and increases packing density and the occurrence of straight lipid chains.

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“…Similarly, Bartlett and Riego (3) found that Al complexed by citric acid or EDTA did not reduce root and shoot growth of corn plants (Zea mays L.), as did ionic Al. In these studies, the organic acids could have detoxified Al either externally in the rhizosphere or internally after absorption by plant roots.Suhayda and Haug (26)(27)(28) found in vitro that organic acids reversed the Al-induced conformational change in the regulatory protein, calmodulin, restoring its stimulatory activity on certain enzymes. The following organic acids were able to protect calmodulin from the deleterious effects of Al in the order: citric > oxalic > malic > tartaric (26,27).…”

mentioning

confidence: 99%

“…Suhayda and Haug (26)(27)(28) found in vitro that organic acids reversed the Al-induced conformational change in the regulatory protein, calmodulin, restoring its stimulatory activity on certain enzymes. The following organic acids were able to protect calmodulin from the deleterious effects of Al in the order: citric > oxalic > malic > tartaric (26,27).…”

mentioning

confidence: 99%

Mechanism of Aluminum Tolerance in Snapbeans

Miyasaka¹,

Buta²,

Howell³

et al. 1991

Plant Physiol.

407

217

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One proposed mechanism of aluminum (Al) tolerance in plants is the release of an Al-chelating compound into the rhizosphere. In this experiment, two cultivars of snapbeans (Phaseolus vulgaris L. "Romano" and "Dade") that differ in Al tolerance were grown hydroponically with and without Al under aseptic conditions. After growth in nutrient solutions for 8 days, aliphatic and phenolic organic acids were analyzed in the culture solutions with an ion chromatograph and a high pressure liquid chromatograph. The tolerant snapbean, "Dade", when exposed to Al, exuded citric acid into the rhizosphere in a concentration that was 70 times as great as that of "Dade" grown without Al, and 10 times as great as that of "Romano" grown with or without Al. The sensitive cultivar, "Romano", exuded only slightly more citric acid into the growing medium under Al-stress, compared to nonstressed conditions. Citric acid is known to chelate Al strongly and to reverse its phytotoxic effects. Also, citric acid has been shown previously to enhance the availability of phosphorus (P) from insoluble Al phosphates. Thus, one mechanism of Al-tolerance in snapbeans appears to be the exudation of citric acid into the rhizosphere, induced either by toxic levels of Al or by low P due to the precipitation of insoluble Al phosphates. Our experiment was not able to distinguish between these two factors; however, tolerance to both primary and secondary Al-stress injuries are important for plants growing in Al-toxic soils.Al toxicity is a major factor limiting plant growth in strongly acid soils (8,9). Liming is used to correct this problem in the plow layer; however, amendment of acid subsoils is not feasible economically (9). Moreover, acid soils are found often in the tropics and subtropics, where resource-poor farmers are not able to afford such a high-input solution (14).An alternative, low-input solution to this problem is to utilize the crop plant's genetic potential for tolerance to Al stress (9). Plant species and cultivars within species vary widely in their resistance to Al injury, and some of these differences are heritable (9 One hypothesized mechanism of Al tolerance is the chelation and detoxification of Al by organic acids, either within the plant (internal tolerance) or in the rhizosphere (exclusion) (8,9,30). Organic acids have been reported to chelate Al and to ameliorate its phytotoxic effects (8, 9, 30). Hue et al. (15) showed that the addition of citric, oxalic, and tartaric acids to the hydroponic solution alleviated the inhibitory effect of Al on root extension of cotton (Gossypium hirsutum L.). Similarly, Bartlett and Riego (3) found that Al complexed by citric acid or EDTA did not reduce root and shoot growth of corn plants (Zea mays L.), as did ionic Al. In these studies, the organic acids could have detoxified Al either externally in the rhizosphere or internally after absorption by plant roots.Suhayda and Haug (26)(27)(28) found in vitro that organic acids reversed the Al-induced conformational change in the regulato...

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Organic acids reduce aluminum toxicity in maize root membranes

Cited by 109 publications

References 30 publications

Dissolution of kaolinite induced by citric, oxalic, and malic acids

Dissolution of kaolinite induced by citric, oxalic, and malic acids

Aluminum and Temperature Alteration of Cell Membrane Permeability of Quercus rubra

Mechanism of Aluminum Tolerance in Snapbeans

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