Effect of organic acids on the availability of cadmium in wheat

Nigam, Rashmi; Srivastava, Shalini; Prakash, S.; Srivastava, M. M.

doi:10.3184/095422900782775481

Cited by 21 publications

(10 citation statements)

References 14 publications

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“…The effects of root exudates on element mobility and pH level in soil is presented as depletion curves in Figures 1-4. Although the excretion of root exudates obviously lead to decreasing pH (Nigam et al 2000, Loosemore et al 2004, in our experiment soil pH in control sample decreased from 6.1 to 5.5 with increasing distance from the roots. Schoettelndreier and FalkengrenGrerup (1999) presented increasing rhizosphere pH compared to bulk soil where the increase correlated with the uptake of NO 3 -by the plants.…”

Section: Rhizobox Experimentscontrasting

confidence: 67%

“…Statistically significant increases in cadmium accumulation of wheat plants grown on cadmium treated soils in the presence of increasing concentration of organic acids suggest the existence of Cd-organic acid interactions in the soil-plant system resulting into the formation of organically bound cadmium which is mobile and plant available (Nigam et al 2000). Concentration of carboxylic acids and their composition in soil solution depends also on element and its concentration level.…”

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confidence: 99%

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The effect of liming on cadmium, lead, and zinc uptake reduction by spring wheat grown in contaminated soil

Tlustoš¹,

Száková²,

Kořínek³

et al. 2006

Plant Soil Environ.

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For characterization of the ability of crops to reflect changing soil properties after the addition of ameliorative materials into the soil both pot and rhizobox experiments were provided. In the pot experiment, the influence of the addition of lime and limestone into contaminated Cambisol containing 7.14 mg Cd/kg, 2174 mg Pb/kg, and 270 mg Zn/kg on element availability for spring wheat was tested. The ameliorative materials were added into the pots containing 5 kg of soil in amount of 3 g CaO, and 5.36 g CaCO 3 per kg of the soil. Soil pH reached up to 7.3 in lime treatments compared to 5.7 in control soil. Mobile portion of soil elements (0.01 mol/l CaCl 2 extractable) dropped by 80% for Zn, 50% for Cd, and 20% for Pb, respectively. In both straw and grains of wheat reduced content of elements was observed in limed pots compared to the control ones. For a detailed characterization of the influence of root exudates on the strength of developed complexes in comparison with the bulk soil, short-term rhizobox experiment was set up under identical soil and lime treatments. Generally, the results of rhizobox experiment confirmed the findings from the pot experiment discussed above. Content of elements in shoots and roots of wheat dropped mainly in the case of Cd and Pb. Soil mobile portion of all three tested elements introduced clear depletion curve in control treatment, both limed treatments showed high stability of element complexes almost unaffected by wheat roots.

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Section: Rhizobox Experimentscontrasting

confidence: 67%

mentioning

confidence: 99%

The effect of liming on cadmium, lead, and zinc uptake reduction by spring wheat grown in contaminated soil

Tlustoš¹,

Száková²,

Kořínek³

et al. 2006

Plant Soil Environ.

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“…Cieśliń ski et al (1998) found that the high Cd accumulating durum wheat cultivar Kyle had significantly higher amounts of organic acids in the rhizosphere soil than that of the low accumulating cultivar Arcola, regardless of soil type. Statistically significant increases were observed in Cd accumulation by wheat with increasing concentrations of organic acids in pot experiments (Nigam et al, 2000). Under hydroponic conditions, Cd uptake and translocation in tomato plants increased after citric acid preincubation (Senden et al, 1995).…”

Section: Introductionmentioning

confidence: 90%

Enhanced cadmium accumulation in maize roots—the impact of organic acids

et al. 2006

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Low molecular weight organic acids are important components of root exudates and therefore, knowledge regarding the mechanisms of cadmium (Cd) uptake and distribution within plants under the influence of organic acids, is necessary for a better understanding of Cd behavior in the plant-soil system. In this study, acetic and malic acids increased the uptake of Cd by maize (Zea mays L. cv. TY2) roots and enhanced Cd accumulation in shoots under hydroponic conditions. Concentration-dependent net Cd influx in the presence and absence of organic acids could be resolved into linear and saturable components. The saturable component followed Michaelis-Menten kinetics, which indicated that Cd uptake across the plasma membrane was transporter-mediated. While the K m values were similar, the V max values in the presence of acetic and malic acids were respectively 6.0 and 3.0 times that of the control. Zinc transporters were the most probable pathways for Cd accumulation. It was hypothesized that Cd(II)-organic acid complexes associated with the root zone, could decompose and liberate Cd 2+ for subsequent absorption by maize roots; and that in the layer of the roots or within the root free space, depletion of Cd 2+ was buffered by the presence of Cd(II)-organic acid complexes. Plant response to elevated Cd levels involved overproduction of organic acids in maize roots as a resistance mechanism to alleviate Cd toxicity.

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“…Root exudates include both high-and lowmolecular-weight compounds, and among them organic acids are some that are likely to affect release and availability of metals in the soil. Cieslinski et al (1997) found that the release of organic acids was cultivar dependent and Nigam et al (2000) demonstrated that organic acids from wheat increased the release of Cd from soil. Cieslinski et al (1998) suggested that different organic acid compositions played an important role in determining the capacity to accumulate Cd in different cultivars of durum wheat.…”

Section: Introductionmentioning

confidence: 98%