Low Molecular Weight Dicarboxylic Acids in Rhizosphere Soil of Durum Wheat

Szmigielska, Anna M.; Rees, K. C. J. Van; Cieslinski, and Grzegorz; Huang, P. M.

doi:10.1021/jf950272z

Cited by 48 publications

(21 citation statements)

References 15 publications

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“…No significant difference in pH of the soil was observed between the rhizosphere soil collected either at 7-week plant growth stage or collected at maturity (data not shown) and the corresponding bulk soil. The significantly lower pH of the rhizosphere soil was attributed to the influence of appreciable amounts of low-molecular-weight organic acids (LMWOAs) which were released by plant roots into the rhizosphere (Szmigielska et al, 1996). In the Idaho phosphate treated soils, the lower pH is partially attributed to the acidity of the phosphate fertilizer.…”

Section: Resultsmentioning

confidence: 99%

Studies on soil rhizosphere: speciation and availability of Cd

Krishnamurti

Huang

Rees

1996

Chemical Speciation & Bioavailability

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The rhizosphere soils of two durum wheat (Triticum turgidum var. durum L.) cultivars Kyle and Arcola grown in two selected soils of southern Saskatchewan were collected both at 2-week and 7-week plant growth stages. The cadmium availability index (CAl), determined as M NH 4 CI-extractable Cd, pH and the distribution of the particulatebound Cd species of the soils were carried out and the data were discussed in comparison with those of the corresponding bulk soil. At the 2-week growth stage, the pH of the rhizosphere soil was less than that of the corresponding bulk soil and the CAl values were higher in the rhizosphere soil, indicating that more Cd was complexed with the low-molecular-weight organic acids (LMWOAs) at the soil-root interface and was extractable by M NH 4 CI. Compared with the bulk soils, the CAl values were 2-9 times higher in the soil rhizosphere of the plots fertilized with Idaho monoammonium phosphate fertilizer at 2-week growth stage, which is attributed to the combined effects of the Cd introduced into the soil rhizosphere from the fertilizer (Cd content of the fertilizer was 144 mg kg-1) and complexation reactions of phosphate and LMWOAs with soil Cd. At 7-week plant growth stage, such differences were not observed. The increased amounts of carbonate-bound and metal-organic complex-bound Cd species of the rhizosphere soils are due to the increased amounts of carbonate, a product of plant respiration, and the LMWOAs at the soil-root interface, respectively. Simple correlation analysis of the data showed that the CAl of the rhizosphere soils of the control plots correlated at least two orders of magnitude better with the metal-organic complex-bound Cd whereas the CAl of the rhizosphere soils treated with Idaho phosphate correlated better with carbonate-bound Cd species in comparison to other species.

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Section: Resultsmentioning

confidence: 99%

Studies on soil rhizosphere: speciation and availability of Cd

Krishnamurti

Huang

Rees

1996

Chemical Speciation & Bioavailability

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“…Root exudation patterns would have continued during this time as the soluble organic acids exist as anions in soil and can be collected in water (George et al 2002;Szmigielska et al 1996). Water samples (50 ml) from the two treatments were collected and centrifuged at 5,000 rpm for 5 min at 4°C in an Eppendorf 5810 R centrifuge to pellet any debris and the supernatant collected.…”

Section: Root Exudatesmentioning

confidence: 99%

The role of a plant/fungal consortium in the degradation of bituminous hard coal

2010

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The sporadic growth of Cynodon dactylon was observed to occur directly on the surface of hard coal in dumps of the Witbank coal mining area of South Africa with the surface coal being broken down into a humic-like particulate material. Microorganism analysis of plants and rhizosphere material from the dumps revealed the presence of arbuscular mycorrhizal fungi and the coal solubilising fungus, Neosartorya fischeri. Studies established to replicate the dump environment revealed increased coal degradation in the form of humic acid production and an increase in small size particles as a result of Cynodon dactylon growth in association with arbuscular mycorrhizal fungi and Neosartorya fischeri. Results suggest that interactions between Cynodon dactylon, arbuscular mycorrhizal fungi, Neosartorya fischeri and other coal-degrading rhizosphere fungi could lead to the degradation of hard coal in situ and that the application of these organisms to discard dumps could be a novel method of coal dump rehabilitation.

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“…Low molecular weight organic acids have been studied in greater detail than the other exudates and have been shown to influence the speciation of Cd in solution (Mench et al, 1988) and in soil (Krishnamurti et al, 1996). However, due to difficulties in collecting rhizosphere soils and the time-consuming procedures for measuring low molecular weight organic acids (Szmigielska et al, 1996), little work has been done to determine free-metal ion concentrations in rhizosphere soil.…”

Section: Rooted Plantsmentioning

confidence: 99%

Coupling the use of computer chemical speciation models and culture techniques in laboratory investigations of trace metal toxicity

Twiss

Errécalde²,

Fortin

et al. 2001

Chemical Speciation & Bioavailability

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Chemical Speciation and Bioavailability (2001), 13(1) ABSTRACTThe bioavailability and toxicity of a dissolved metal are closely linked to the metal's chemical speciation in solution. A variety of inorganic and organic ligands are often used in laboratory toxicity tests to control the concentration of labile trace metal in solution. Computerised chemical speciation models based on thermodynamic principles can be used to estimate metal speciation under such experimental conditions. However, these models are sensitive to the quality of their thermodynamic databases. Detailed protocols for the incorporation of reliable equilibrium formation constants into widely available computer chemical speciation programs (e.g., MINEQL+ and MINTEQ) are provided. The examples demonstrate both the benefits and the potential pitfalls involved in the use of chemical speciation models. The application of chemical speciation modelling to metal toxicity studies is discussed and guidelines are proposed for its proper use. Both defined media and chemical speciation programs have co-existed for two decades but the combined use of these techniques has been reserved for those possessing in-depth knowledge of both chemistry and biology. The techniques presented should enable an investigator with basic biological, chemical and computing skills to design an aqueous medium and incorporate correct thermodynamic constants into a computer chemical speciation program, starting from a standardised database, thereby providing a sound framework for critically assessing the biological response of a particular test organism to a given metal.

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Low Molecular Weight Dicarboxylic Acids in Rhizosphere Soil of Durum Wheat

Cited by 48 publications

References 15 publications

Studies on soil rhizosphere: speciation and availability of Cd

Studies on soil rhizosphere: speciation and availability of Cd

The role of a plant/fungal consortium in the degradation of bituminous hard coal

Coupling the use of computer chemical speciation models and culture techniques in laboratory investigations of trace metal toxicity

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