Toxic Heavy Metal and Metalloid Accumulation in Crop Plants and Foods

Clemens, Stephan; Feng, Jian

doi:10.1146/annurev-arplant-043015-112301

Cited by 845 publications

(469 citation statements)

References 146 publications

(71 reference statements)

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“…18,19,21–33 Prior work proposes that arsenic-bound thiol(ate) complexes may be immobilized and sequestered in root cell vacuoles as a detoxifying mechanism leading to potentially highly localized accumulation in arsenic tolerant species, but direct evidence is scant. 2,21,33,34 Among such plants studied previously in laboratory systems is Prosopis juliflora (mesquite). This halophytic tree, tolerant to growth in compost-amended IKMHSS tailings, is part of a field-scale experiment assessing long-term feasibility of a direct planting phytostabilization.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Arsenic Sequestration by Prosopis juliflora during the Phytostabilization of Metalliferous Mine Tailings

Hammond

Root

Maier

et al. 2018

Environ. Sci. Technol.

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Phytostabilization is a cost-effective long-term bioremediation technique for the immobilization of metalliferous mine tailings. However, the biogeochemical processes affecting metal(loid) molecular stabilization and mobility in the root zone remain poorly resolved. The roots of Prosopis juliflora grown for up to 36 months in compost-amended pyritic mine tailings from a federal Superfund site were investigated by microscale and bulk synchrotron X-ray absorption spectroscopy (XAS) and multiple energy micro-X-ray fluorescence imaging to determine iron, arsenic, and sulfur speciation, abundance, and spatial distribution. Whereas ferrihydrite-bound As(V) species predominated in the initial bulk mine tailings, the rhizosphere speciation of arsenic was distinctly different. Root-associated As(V) was immobilized on the root epidermis bound to ferric sulfate precipitates and within root vacuoles as trivalent As(III)–(SR)3 tris-thiolate complexes. Molar Fe-to-As ratios of root epidermis tissue were two times higher than the 15% compost-amended bulk tailings growth medium. Rhizoplane-associated ferric sulfate phases that showed a high capacity to scavenge As(V) were dissimilar from the bulk-tailings mineralogy as shown by XAS and X-ray diffraction, indicating a root-surface mechanism for their formation or accumulation.

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Section: Introductionmentioning

confidence: 99%

Mechanisms of Arsenic Sequestration by Prosopis juliflora during the Phytostabilization of Metalliferous Mine Tailings

Hammond

Root

Maier

et al. 2018

Environ. Sci. Technol.

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“…Compared with other heavy metals, Cd has a relatively high bioavailability in soil and can be readily taken up by plants (Bolan et al 2003; Clemens & Ma, 2016). Substantial proportions of rice grain produced in some areas in southern China were found to exceed the Chinese Food Hygiene Standards for Cd (0.2 mg kg -1 ) (Zhen et al, 2008; Zhu et al, 2008; GB2762, 2012).…”

Section: Introductionmentioning

confidence: 99%

Genotypic and Environmental Variations in Grain Cadmium and Arsenic Concentrations Among a Panel of High Yielding Rice Cultivars

Duan

Shao

Tang

et al. 2017

Rice

131

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BackgroundRice is a major dietary source of cadmium (Cd) and arsenic (As) for populations consuming rice as the staple food. Excessive Cd and As accumulation in rice grain is of great concern worldwide, especially in South China where soil contamination with heavy metals and metalloids is widespread. It is important to reduce Cd and As accumulation in rice grain through selection and breeding of cultivars accumulating low levels of Cd or As.ResultsTo assess the genetic and environmental variations in the concentrations of Cd and As in rice grains, 471 locally adapted high-yielding rice cultivars were grown at three moderately contaminated sites in South China for two years. Cadmium and As concentrations in brown rice varied by 10 – 32 and 2.5 – 4 fold, respectively. Genotype (G), environment (E) and G x E interactions were highly significant factors explaining the variations. Brown rice Cd concentration was found to correlate positively with the heading date among different cultivars, whereas As concentration and heading date correlated negatively. There was a significant and negative correlation between grain Cd and As concentrations.ConclusionsEight and 6 rice cultivars were identified as stable low accumulators of Cd and As, respectively, based on the multiple site and season trials. These cultivars are likely to be compliant with the grain Cd or As limits of the Chinese Food Safety Standards when grown in moderately contaminated paddy soils in South China.Electronic supplementary materialThe online version of this article (doi:10.1186/s12284-017-0149-2) contains supplementary material, which is available to authorized users.

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“…Exposure to metals can occur through a variety of processes. For As and Cd, intake of plant-derived food represents a major fraction of potentially health-threatening human exposure (Clemens and Ma 2016).…”

Section: Introductionmentioning

confidence: 99%

Soilless system on peat reduce trace metals in urban-grown food: unexpected evidence for a soil origin of plant contamination

Pennisi

Orsini

Gasperi

et al. 2016

Agron. Sustain. Dev.

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Urban horticulture is increasingly popular for social and economic benefits. However, edible urban crops may be contaminated by airborne pollutants, thus leading to serious health risks. Therefore, a better understanding of contamination risks of urban cultivation is needed in order to define safe practices. In particular, whereas it is commonly accepted that the contamination of urban-grown food comes from airborne pollutants, little is known on a possible contamination by soils. Here, we studied trace metal risk in horticultural crops grown in an experimental urban allotment garden in Bologna, Italy. Seven experiments were conducted between June and November 2015 on tomato, sweet basil, onion, lettuce, kale, bulb fennel and radish. Treatments included two growing systems, soil and soilless, and two fertilization managements, mineral and organic. Trace metal concentrations were measured in soils, substrates and edible plant tissues. We identified preferentially translocated metals by partitioning analysis of tomato, sweet basil and kale. Results showed that crops grown in a soilless system have a lower metal content of −70 % for Cr, −61 % for Cu, −45 % for Cd and −81 % for Ni, compared with those grown in soil. This finding demonstrates that the major contamination risk in an urban area is unexpectedly related to soil pollution.

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Toxic Heavy Metal and Metalloid Accumulation in Crop Plants and Foods

Cited by 845 publications

References 146 publications

Mechanisms of Arsenic Sequestration by Prosopis juliflora during the Phytostabilization of Metalliferous Mine Tailings

Mechanisms of Arsenic Sequestration by Prosopis juliflora during the Phytostabilization of Metalliferous Mine Tailings

Genotypic and Environmental Variations in Grain Cadmium and Arsenic Concentrations Among a Panel of High Yielding Rice Cultivars

Soilless system on peat reduce trace metals in urban-grown food: unexpected evidence for a soil origin of plant contamination

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