Change in phytoextraction of Cd by rapeseed (Brassica napus L.) with application rate of organic acids and the impact of Cd migration from bulk soil to the rhizosphere

Qiao, Dongmei; Lu, Hai Bo; Zhang, Xiaoxian

doi:10.1016/j.envpol.2020.115452

Cited by 53 publications

(15 citation statements)

References 71 publications

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“…In this study, the content of O-Cd, FM-Cd, and T-Cd in soils had a negative correlation with the change in dry weight of oilseed sunflower. The Cd in soils inhibited plant growth, and the application of acetic acid significantly alleviated this inhibition, which is similar to the results of previous studies [37,41].…”

Section: Discussionsupporting

confidence: 91%

“…The effects of different organic acids on the accumulation of Cd were different. Recent research has shown that oxalic acid, acetic acid, lactic acid, malic acid, citric acid, and tartaric acid could improve the ability of plants to absorb Cd in soils [37][38][39][40]. Of which, the remediation effect of Cd-contaminated soils with acetic acid was most prominent among various organic acids [41].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Acetic Acid Application Strategy Can Effectively Promote the Remediation Performance of Oilseed Sunflower on Cd-Contaminated Soils

et al. 2022

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Applying exogenous organic acids is an effective method to improve the remediation efficiency of Cd-contaminated soils. To investigate the effects of exogenous acetic acid on Cd forms in rhizosphere soils and phytoremediation performance for Cd-contaminated soils, a potted experiment was performed with oilseed sunflower as the extractive plant. Acetic acid was applied at 1, 2, 3, 4, 5, and 6 mmol/kg at 20, 30, 40, and 50 days after seedling emergence. Soil without acetic acid was used as a control (CK). Emblematic chemical properties and different Cd forms in rhizosphere soils were inspected. Results showed that adding acetic acids improved the biomass of shoot and root; it increased firstly and then decreased with the increase of acetic acid concentrations. For all treatments, acetic acids increased sucrase activity and catalase activity but decreased amylase activity in rhizosphere soils. At 30 or 40 days after seedling emergence, the exchangeable Cd content, Fe-Mn oxide Cd content, and organic Cd content were lower, while the carbonate Cd content was greater. Adding acetic acids improved the removal rate of Cd, and when 1 mmol/kg acetic acid was applied at 40 days after seedling emergence, it was increased by 60%, which was the highest compared to CK. RDA showed that catalase activity, sucrase activity, carbonate Cd, and pH could promote the growth of oilseed sunflower, while organic Cd, Fe-Mn oxide Cd, total Cd, exchangeable Cd, and amylase activity inhibited the growth of oilseed sunflower. These findings suggest that acetic acid can improve the efficiency of phytoremediation in Cd-contaminated soils. In particular, the treatment with 1 mmol/kg acetic acid at 40 days after seedling emergence had the most obvious effect.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Optimizing Acetic Acid Application Strategy Can Effectively Promote the Remediation Performance of Oilseed Sunflower on Cd-Contaminated Soils

et al. 2022

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“…The bioavailability of HMs in soils can be enhanced, since organic acids can solubilize metal oxides and assist the plant to uptake the contaminants from soil [ 26 ]. Due to the limited secretion of OAs by plant roots, adding exogenous OAs is an effective method to improve phytoremediation, since they are efficient chelating agents for the cleaning up of toxic HMs from soils [ 27 , 28 ]. In addition, oxygenation can increase the oxygen content and hence, the aerobic respiration of crop roots is improved, increasing enzyme activity in the soil.…”

Section: Introductionmentioning

confidence: 99%

Capacity of Nerium oleander to Phytoremediate Sb-Contaminated Soils Assisted by Organic Acids and Oxygen Nanobubbles

Σερίδου

Monogyiou

Syranidou

et al. 2022

Plants

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Antimony (Sb) is considered to be a toxic metalloid of increasing prevalence in the environment. Although several phytoremediation studies have been conducted, research regarding the mechanisms of Sb accumulation and translocation within plants remains limited. In this study, soil from a shooting range was collected and spiked with an initial Sb(III) concentration of 50 mg/kg. A pot experiment was conducted to investigate whether Nerium oleander could accumulate Sb in the root and further translocate it to the aboveground tissue. Biostimulation of the soil was performed by the addition of organic acids (OAs), consisting of citric, ascorbic, and oxalic acid at low (7 mmol/kg) or high (70 mmol/kg) concentrations. The impact of irrigation with water supplemented with oxygen nanobubbles (O2NBs) was also investigated. The results demonstrate that there was a loss in plant growth in all treatments and the presence of OAs and O2NBs assisted the plant to maintain the water content at the level close to the control. The plant was not affected with regards to chlorophyll content in all treatments, while the antioxidant enzyme activity of guaiacol peroxidase (GPOD) in the roots was found to be significantly higher in the presence of Sb. Results revealed that Sb accumulation was greater in the treatment with the highest OAs concentration, with a bioconcentration factor greater than 1.0. The translocation of Sb for every treatment was very low, confirming that N. oleander plant cannot transfer Sb from the root to the shoots. A higher amount of Sb was accumulated in the plants that were irrigated with the O2NBs, although the translocation of Sb was not increased. The present study provides evidence for the phytoremediation capacity of N. oleander to bioaccumulate Sb when assisted by biostimulation with OAs.

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“…Using different chelators, such as chelators from aminopolycarboxylic acids group (EDTA, EDDS) or natural low molecular weight organic acid group (acetic, oxalic, citric, malic, tartaric acid) as priming molecules improved Cd extraction (Chen et al, 2020). Qiao et al (2020) showed that acetic, oxalic, citric acid, malic, and tartaric acid applied by foliar spraying improved Cd uptake by more than 100% due to the increase in exchangeable Cd in the rhizosphere. The combination of citric acid and ethylenediamine disuccinate (EDDS) further improved Cd extraction efficiencies in Helianthus annuus L. (Chen et al, 2020).…”

Section: Priming With Moleculesmentioning

confidence: 99%

Thinking for the future: Phytoextraction of cadmium using primed plants for sustainable soil clean‐up

Karalija

Selović

Bešta-Gajević

et al. 2022

Physiologia Plantarum

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Cadmium (Cd) soil contamination is a global problem for food security due to its ubiquity, toxicity at low levels, persistence, and bioaccumulation in living organisms. Humans' intake of heavy metals is usually due to direct contact with contaminated soil, through the food chain (Cd accumulation in crops and edible plants) or through drinking water in cases of coupled groundwater‐surface water systems. Phytoextraction is one of the eco‐friendly, sustainable solutions that can be used as a method for soil clean‐up with the possibility of re‐use of extracted metals through phytomining. Phytoextraction is often limited by the tolerance level of hyperaccumulating plants and the restriction of their growth. Mechanisms of hyperaccumulation of heavy metals in tolerant species have been studied, but there are almost no data on mechanisms of further improvement of the accumulation capacity of such plants. Priming can influence plant stress tolerance by the initiation of mild stress cues resulting in acclimation of the plant. The potential of plant priming in abiotic stress tolerance has been extensively investigated using different types of molecules that are supplemented exogenously to plant organs (roots, leaves, etc.), resulting in enhanced tolerance of abiotic stress. This review focuses on mechanisms of enhancement of plant stress tolerance in hyperaccumulating plants for their exploitation in phytoextraction processes.

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Change in phytoextraction of Cd by rapeseed (Brassica napus L.) with application rate of organic acids and the impact of Cd migration from bulk soil to the rhizosphere

Cited by 53 publications

References 71 publications

Optimizing Acetic Acid Application Strategy Can Effectively Promote the Remediation Performance of Oilseed Sunflower on Cd-Contaminated Soils

Optimizing Acetic Acid Application Strategy Can Effectively Promote the Remediation Performance of Oilseed Sunflower on Cd-Contaminated Soils

Capacity of Nerium oleander to Phytoremediate Sb-Contaminated Soils Assisted by Organic Acids and Oxygen Nanobubbles

Thinking for the future: Phytoextraction of cadmium using primed plants for sustainable soil clean‐up

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