Inhibition of Cd accumulation in grains of wheat and rice under rotation mode using composite silicate amendment

Li, Yang; Liang, Xuefeng; Huang, Qingqing; Yue, Xu; Yang, Fang

doi:10.1039/c9ra07137g

Cited by 12 publications

(5 citation statements)

References 44 publications

(38 reference statements)

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“…It is the primary source of heavy metals in plant tissues. Therefore, the transformation of highly biologically available weak acid-extracted heavy metals into less utilizable residual forms is crucial for soil metal immobilization [34]. The speciation of heavy metals in the soil determines their effectiveness and content in plant tissue.…”

Section: Discussionmentioning

confidence: 99%

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Chen,

Wang,

et al. 2024

Agronomy

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The soil in a lead–zinc mining area, contaminated with heavy metals like cadmium (Cd) and lead (Pb), poses a risk to crops such as maize. Experiments using biochar and sepiolite as soil ameliorants in potted maize showed these substances can mitigate heavy metal contamination. Biochar increased potassium and phosphorus in the soil and maize, while sepiolite significantly boosted overground phosphorus by 73.2%. Both ameliorants transformed Cd and Pb into a more stable state in the soil, reducing their accumulation in maize, especially with biochar, which effectively inhibited metal migration during leaching events. This study provided insights for further improvement of soil amendments and multi-factor application experiments.

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Section: Discussionmentioning

confidence: 99%

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Chen,

Wang,

et al. 2024

Agronomy

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“…Plant cells have no Cd-selective transporter; hence, Cd uptake occurs through plasma membrane transporters involved in the uptake of other divalent cations, including Ca, Mg, Fe, Zn, Mn, and Cu [68]. Most of studies in the field were conducted on rice [69][70][71]. Several families of transporters have been implied to be responsible for Cd accumulation (Figure 2).…”

Section: Uptake By Rootsmentioning

confidence: 99%

“…Of all the transporters above, NRAMP members have been demonstrated to be involved in numerous functions including uptake, translocation, intracellular transport, and detoxification of transition metals in many species [41,71,[79][80][81][82][83]. In rice, OsNRAMP5, which plays a major role in Mn 2+ uptake, may also represent a major route of Cd uptake by roots [73,82].…”

Section: Uptake By Rootsmentioning

confidence: 99%

Reducing Cadmium Accumulation in Plants: Structure–Function Relations and Tissue-Specific Operation of Transporters in the Spotlight

Huang

Duan

et al. 2020

Plants

104

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Cadmium (Cd) is present in many soils and, when entering the food chain, represents a major health threat to humans. Reducing Cd accumulation in plants is complicated by the fact that most known Cd transporters also operate in the transport of essential nutrients such as Zn, Fe, Mn, or Cu. This work summarizes the current knowledge of mechanisms mediating Cd uptake, radial transport, and translocation within the plant. It is concluded that real progress in the field may be only achieved if the transport of Cd and the above beneficial micronutrients is uncoupled, and we discuss the possible ways of achieving this goal. Accordingly, we suggest that the major focus of research in the field should be on the structure–function relations of various transporter isoforms and the functional assessment of their tissue-specific operation. Of specific importance are two tissues. The first one is a xylem parenchyma in plant roots; a major “controller” of Cd loading into the xylem and its transport to the shoot. The second one is a phloem tissue that operates in the last step of a metal transport. Another promising and currently underexplored avenue is to understand the role of non-selective cation channels in Cd uptake and reveal mechanisms of their regulation.

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“…However, to date, little is known about the bioaccesssibility of Cd in pak choi harvested from agricultural soils remediated by in situ soil immobilization of Cd and the associated risks associated with its consumption. The beneficial effects of in situ soil Cd immobilization in reducing Cd accumulation in other crops such as rice have been well documented ( 24 , 25 ). However, its effect on the bioaccessibility of Cd in vegetables has not received sufficient attention.…”

Section: Introductionmentioning

confidence: 99%

Effects of wollastonite and phosphate treatments on cadmium bioaccessibility in pak choi (Brassica rapa L. ssp. chinensis) grown in contaminated soils

Guo,

Zhao,

Zhang

et al. 2024

Front. Nutr.

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Cadmium (Cd) contamination of soil can strongly impact human health through the food chain due to uptake by crop plants. Inorganic immobilizing agents such as silicates and phosphates have been shown to effectively reduce Cd transfer from the soil to cereal crops. However, the effects of such agents on total Cd and its bioaccessibility in leafy vegetables are not yet known. Pak choi (Brassica rapa L. ssp. chinensis) was here selected as a representative leafy vegetable to be tested in pots to reveal the effects of silicate–phosphate amendments on soil Cd chemical fractions, total plant Cd levels, and plant bioaccessibility. The collected Cd contaminated soil was mixed with control soil at 1:0, 1:1, 1:4, 0:1 with a view to Cd high/moderate/mild/control soil samples. Three heavy metal-immobilizing agents: wollastonite (W), potassium tripolyphosphate (KTPP), and sodium hexametaphosphate (SHMP) were added to the soil in order to get four different treatment groups, i.e., control (CK), application of wollastonite alone (W), wollastonite co-applied with KTPP (WKTPP), application of wollastonite co-applied with SHMP (WSHMP) for remediation of soils with different levels of Cd contamination. All three treatments increased the effective bio-Cd concentration in the soils with varying levels of contamination, except for W under moderate and heavy Cd contamination. The total Cd concentration in pak choi plants grown in mildly Cd-contaminated soil was elevated by 86.2% after WKTPP treatment compared to the control treatment could function as a phytoremediation aid for mildly Cd-contaminated soil. Using an in vitro digestion method (physiologically based extraction test) combined with transmission electron microscopy, silicate and phosphorus agents were found to reduce the bioaccessibility of Cd in pak choi by up to 66.13% with WSHMP treatment. Application of silicate alone reduced soil bio-Cd concentration through the formation of insoluble complexes and silanol groups with Cd, but the addition of phosphate may have facilitated Cd translocation into pak choi by first co-precipitating with Ca in wollastonite while simultaneously altering soil pH. Meanwhile, wollastonite and phosphate treatments may cause Cd to be firmly enclosed in the cell wall in an insoluble form, reducing its translocation to edible parts and decreasing the bioaccessibility of Cd in pak choi. This study contributes to the mitigation of Cd bioaccessibility in pak choi by reducing soil Cd concentration through in situ remediation and will help us to extend the effects of wollastonite and phosphate on Cd bioaccessibility to other common vegetables. Therefore, this study thus reveals effective strategies for the remediation of soil Cd and the reduction of Cd bioaccessibility in crops based on two indicators: total Cd and Cd bioaccessibility. Our findings contribute to the development of methods for safer cultivation of commonly consumed leafy vegetables and for soil remediation.

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Inhibition of Cd accumulation in grains of wheat and rice under rotation mode using composite silicate amendment

Abstract: Composite silicate amendment had significant immobilization effects for phytoavailable Cd in the soil and inhibitory effect on the accumulation of Cd in crop grains under in field-scale remediation under wheat/rice rotation mode.

Cited by 12 publications

References 44 publications

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Remediation of Cadmium and Lead in Mine Soil by Ameliorants and Its Impact on Maize (Zea mays L.) Cultivation

Reducing Cadmium Accumulation in Plants: Structure–Function Relations and Tissue-Specific Operation of Transporters in the Spotlight

Effects of wollastonite and phosphate treatments on cadmium bioaccessibility in pak choi (Brassica rapa L. ssp. chinensis) grown in contaminated soils

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