Organic matter influences phytotoxicity of cadmium to soybeans

Strickland, R. C.; Chaney, William R.; Lamoreaux, Robert J.

doi:10.1007/bf02185582

Cited by 32 publications

(13 citation statements)

References 11 publications

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“…An apparent synergism in the sandy soil could be explained on the basis of an enhanced Cd concentration following a dramatic decrease in dry matter production by excess Zn. The opposite effect, a decrease in plant Cd concentration, following a strong growth response to applied organic matter ('dilution'), was clearly described by Strickland et al (1979). Kiekens et al (1984) apply the concept of the so-called transfer coefficient Ca-, defined as: increase in plant metal concentration C T ~ . increase in soil metal concentration i.e.…”

Section: Discussionmentioning

confidence: 99%

The extraction by soil and absorption by plants of applied zinc and cadmium

Smilde¹,

Luit²,

Driel³

1992

Plant Soil

103

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In five consecutive years lettuce, spinach, spring wheat, endive and maize were grown in pots and the effects of 'native' and soil-applied Zn and Cd on plant Zn and Cd concentrations were studied. The normal interactive pattern was antagonistic, Zn reducing plant Cd uptake, and conversely, but less so. Only in loam soil Zn and Cd were synergistic to some extent, plant Zn uptake increasing with applied Cd.When relating total soil Cd/Zn to plant Cd/Zn separate sets of data could be distinguished for loam and sandy soil, each fitting a straight line. The use of 0.1 M CaCI 2 instead of 'total' extractable soil Cd/Zn makes the two sets of data to coalesce around a single straight line. All crops were found to show a positive linear relationship between 0.1 M CaCl~-extractable soil Cd/Zn and plant Cd/Zn.

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Section: Discussionmentioning

confidence: 99%

The extraction by soil and absorption by plants of applied zinc and cadmium

Smilde¹,

Luit²,

Driel³

1992

Plant Soil

103

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“…More interestingly, this relative enhancement was not eliminated by the presence of Cd (Table 19.1). This positive influence suggests that HS alleviates the toxic action of Cd, as has been reported for plants grown in soils (Strickland et al 1979). …”

Section: Effect Of CD and Humic Substances On Biomass Productionsupporting

confidence: 73%

“…For example, they influence nutrient uptake, nitrogen metabolism, enzymes activities, and membrane permeability in plants (MacCarthy et al 1990;Chen and Aviad 1990;Chen et al 1994). In addition, HS have been shown to protect plants from toxic effects of excess metals and to alleviate toxic effect of Cd, Zn and Cu (Strickland et al 1979;Kinnersley 1993). Despite the abundance of descriptive effects, little is known about the chemical mechanism(s) by which HS influence these biological activities.…”

Section: Part IImentioning

confidence: 99%

Effect of Cadmium and Humic Acids on Metal Accumulation in Plants

Baraud¹,

Fan²,

Higashi³

Environmental Chemistry

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The natural ability of plants to accumulate, exclude or stabilize elements could be exploited to remediate soils contaminated with metals. To implement this alternative technology termed phytoremediation, it is crucial to better understand the various processes controlling metal mobilization or immobilization, uptake, and sequestration by the plants. Metal chelation is recognized as a vital biological process that regulates metal solubility, bioavailability, and internal storage in plants. Natural ligands, e.g. soil humates, root exudates components, or synthetic chelators, i.e. ethylenediaminetretraacetic acid or EDTA, can interact in a yet-to-be-defined way to influence metal uptake and sequestration by plants. Here, we investigated the interactive effect of Cd and soil humates on metal acquisition and translocation in wheat plants. Metal contents in tissues and root exudates composition were determined, using X-ray fluorescence for metals and gas chromatography-mass spectrometry (GC-MS) and nuclear magnetic resonance (NMR) for organic exudates. Cd inhibited biomass production, from -55% to -65% on tissue dry weight basis, and greatly reduced root exudation, of about -84% by dry weight. Cd treatment also resulted in a substantial co-accumulation of transition metals (Fe, Ni, Cu, Zn) and Cd in wheat roots. Moreover, co-treatment with humates alleviated some of the Cd effect showing biomass inhibition reduced by about 10% for the tissues and 17% for the exudates, while accumulation of some metals (Zn, Cu, Ni, Cd) in the root was enhanced. Thus, under Cd treatment, with or without humate, the enhanced accumulation of metals was not mediated via root exudation. This is contrary to the exudate-mediated Fe acquisition under Fe deficiency. The mechanism for this phenomenon is being sought.

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“…Plants were grown from seed to maturity. Strickland et al (1979) evaluated the effects of Cd (1.25, 2.5, 5, 10, and 20 ppm Cd as CdCl ) on 2 soybeans grown from seed for 6 weeks in varying ratios of sand and peat. While increasing the amount of organic matter in the mixture from 0 to 2%, the concentration of Cd required to reduce plant growth by 20% was increased from 1.25 ppm (lowest concentration tested) to 20 ppm.…”

Section: Cadmiummentioning

confidence: 99%

Toxicological Benchmarks for Screening Potential Contaminants of Concern for Effects on Terrestrial Plants

Suter¹

1993

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Organic matter influences phytotoxicity of cadmium to soybeans

Cited by 32 publications

References 11 publications

The extraction by soil and absorption by plants of applied zinc and cadmium

The extraction by soil and absorption by plants of applied zinc and cadmium

Effect of Cadmium and Humic Acids on Metal Accumulation in Plants

Toxicological Benchmarks for Screening Potential Contaminants of Concern for Effects on Terrestrial Plants

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