Rhizosphere characteristics of zinc hyperaccumulator Sedum alfredii involved in zinc accumulation

Li, Tingqiang; Di, Zhenzhen; Islam, Ejazul; Jiang, Hong; Yang, Xiaoe

doi:10.1016/j.jhazmat.2010.09.093

Cited by 77 publications

(22 citation statements)

References 38 publications

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“…A small number of field evaluations of the effectiveness of hyperaccumulators in remediation of Cdor DDT-contaminated soils have been performed [10,[20][21][22]. The roots of SA can excrete high levels of dissolved organic matter that complex and detoxify heavy metals in the rhizosphere; this excretion of dissolved organic matter could be beneficial to DDTdegrading microorganisms in the soil [23]. However, few studies have reported the use of metal hyperaccumulators to improve the removal of organic and inorganic pollutants from co-contaminated soils [9,24].…”

Section: Introductionmentioning

confidence: 99%

Bioremediation of Cd-DDT co-contaminated soil using the Cd-hyperaccumulator Sedum alfredii and DDT-degrading microbes

Zhu

Yang

Wang

et al. 2012

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Bioremediation of Cd-DDT co-contaminated soil using the Cd-hyperaccumulator Sedum alfredii and DDT-degrading microbes

Zhu

Yang

Wang

et al. 2012

Journal of Hazardous Materials

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“…Root Â soil interactions in the rhizosphere play a key role in controlling metal bioavailability to plants, so research has focused on the influence of rhizosphere on plant metal accumulation (Li et al, 2011a;Zhang et al, 2014b). We found that metal bioavailability in both R and NR can affect metal accumulation in castor bean.…”

Section: Discussionmentioning

confidence: 88%

“…Therefore, soil pH did not strongly affect the Cd and Pb bioavailability in the soil following chelate application. Li et al (2011a) suggested that rhizosphere acidification is important for mobilizing soil metals by the hyperaccumulating S. alfredii ecotype. No significant changes in pH were observed in either rhizosphere or bulk soil of the non-hyperaccumulating S. alfredii ecotype.…”

Section: Discussionmentioning

confidence: 99%

Comparison of chelates for enhancing Ricinus communis L. phytoremediation of Cd and Pb contaminated soil

Zhang

Guo

Yang

et al. 2016

Ecotoxicology and Environmental Safety

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a b s t r a c tWe studied chelate effects on castor bean (Ricinus communis L.) growth. These effects included Cd and Pb accumulation in plant tissues and the chemical behavior of Cd and Pb in the plant rhizosphere and nonrhizosphere. Tests were conducted in a glasshouse using the rhizobag method. Two castor bean cultivars (Zibo-3 and Zibo-9) were grown in soil contaminated with 3.53 mg/kg Cd and 274 mg/kg Pb. The soil was treated with citric acid (CA), ethylenediamine disuccinic acid (EDDS) or ethylenediamine tetraacetic acid (EDTA) (5 mmol/kg). EDDS-treated soil produced 28.8% and 59.4% greater biomass for Zibo-3 and Zibo-9 respectively. In contrast, CA and EDTA inhibited the growth of the two cultivars. Zibo-9 had greater tolerance than Zibo-3 to chelate toxicity. Based on Cd and Pb plant uptake, EDDS could substitute for EDTA for phytoremediation of Cd in soil. EDTA was the most effective of the three chelates for Pb phytoremediation but it is less suitable for field use due to toxicology environmental persistence. Acid extractable Cd and Pb in the rhizosphere or reducible Cd and Pb in the non-rhizosphere of soil were the main influences on Cd and Pb accumulation in castor bean.

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“…Thus, the influence of SOC on plant metal uptake depends on both SOC content and its components. In addition, Li, Di, Islam, Jiang, and Yang () found that DOM concentration in the rhizosphere of S. alfredii was much greater than in its non‐rhizosphere zone and the rhizosphere of the non‐hyperaccumulating ecotype. Furthermore, DOM exudation by S. alfredii increased considerably the solubility of minerals, such as Zn phosphates and Zn carbonates, by forming soluble metal–organic complexes.…”

Section: Discussionmentioning

confidence: 99%

“…uncontaminated soils at high pH), corresponding to Zn DGT < 0.5 μM (32.5 μg L −1 ) (Degryse et al, ), much smaller than the average value (298 μg L −1 ) in this study, may Zn uptake by S. plumbizincicola be diffusion limited. (ii) Hyperaccumulating species might release organic acids to increase Zn solubility or promote microbial activities (rhizosphere mobilization) to increase Zn uptake, particularly in soils with small Zn concentrations (Li et al, ). The relatively small Zn DGT /Zn soln values for soils with Zn total < 100 mg kg −1 in our study (range 0.09–0.46) indicated that most soils with small Zn total had little capacity to supply Zn to the soil solution and rhizosphere mobilization might be induced.…”

Section: Discussionmentioning

confidence: 99%

Comparing chemical extraction and a piecewise function with diffusive gradients in thin films for accurate estimation of soil zinc bioavailability to Sedum plumbizincicola

Zhou

et al. 2019

European J Soil Science

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Summary Accurate evaluation of metal bioavailability to hyperaccumulators is necessary for prediction of metal uptake and estimation of phytoextraction potential. Sedum plumbizincicola X.H. Guo et S.B. Zhou ex L.H. Wu (Crassulaceae), a hyperaccumulator of cadmium (Cd) and zinc (Zn), was grown in a pot experiment in 108 agricultural soils representing a wide range of typical Chinese soil types. The contribution of soil properties to Zn uptake was assessed quantitatively. Soil total Zn, soluble Zn, CaCl2‐extractable Zn and (DGT)‐extractable Zn concentrations (Zntotal, Znsoln, ZnCaCl2 and ZnDGT, respectively) were compared to predict shoot Zn concentration (Znshoot) using a piecewise equation. This showed a logarithmic increase with increasing Zntotal from 100–1000 mg kg−1 but plateaued outside this range. The optimum soil pH for Zn removal was ~ 5.5 and further acidification was unnecessary because Znshoot increased significantly with a decrease in pH from 7.5 to 5.5 and rarely changed at pH < 5.5. Sedum plumbizincicola grown in loamy or clay loam soils had larger Znshoot than in sandy or clay soils. The ZnCaCl2 was superior to other methods in estimating Zn bioavailability across all the data. At pH < 5.5, ZnCaCl2 showed much stronger correlation with Znshoot than Zntotal, Znsoln or ZnDGT. Piecewise equations (single linear regression equations at different intervals of soil properties) versus Zntotal and ZnCaCl2 at different pH ranges considerably increased the accuracy of prediction of Znshoot compared with the global equations derived from all data. Estimation of the potential of S. plumbizincicola for Zn phytoextraction in the field indicated that it is feasible to decontaminate acid‐polluted soils with Zntotal ≤ 500 mg kg−1 with S. plumbizincicola. Highlights Zn bioavailability to hyperaccumulators needs to be estimated over a wide range of soil types. Piecewise equations considerably improved the prediction of shoot Zn concentration. CaCl2 extraction was more suitable than DGT for the estimation of Zn bioavailability. Decontamination with S. plumbizincicola is feasible for acid soils with Zntotal ≤ 500 mg kg−1.

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Rhizosphere characteristics of zinc hyperaccumulator Sedum alfredii involved in zinc accumulation

Cited by 77 publications

References 38 publications

Bioremediation of Cd-DDT co-contaminated soil using the Cd-hyperaccumulator Sedum alfredii and DDT-degrading microbes

Bioremediation of Cd-DDT co-contaminated soil using the Cd-hyperaccumulator Sedum alfredii and DDT-degrading microbes

Comparison of chelates for enhancing Ricinus communis L. phytoremediation of Cd and Pb contaminated soil

Comparing chemical extraction and a piecewise function with diffusive gradients in thin films for accurate estimation of soil zinc bioavailability to Sedum plumbizincicola

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