Uptake and Accumulation of Cadmium and Zinc by Sedum Alfredii Hance at Different Cd/Zn Supply Levels

Yang, Xiaoxiao; Ye, H. B.; Xin, Long; Ben-teng, HE; He, Zhenli; Stoffella, P. J.; Calvert, D. V.

doi:10.1081/lpla-200030082

Cited by 10 publications

(12 citation statements)

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“…Therefore, it is an ideal plant for studying mechanisms responsible for hyperaccumulation and phytoremediation practice. Tolerance to elevated Zn in nutrient solution and high Zn accumulation in S. alfredii have been reported Ni et al, 2004;Yang et al, 2001Yang et al, , 2002Yang et al, , 2004). Comparison between the hyperaccumulating ecotype (HE) and the nonhyperaccumulating ecotype (NHE) of S. alfredii under nutrient solution culture condition showed that Zn concentration were over 19-fold higher in leaves and stems of the HE than the NHE, when grown with external Zn 20-160 mg L )1 , and Zn uptake by shoots (or accumulated in shoots) of the HE was over 20-fold higher than that of the NHE (Ni et al, 2004;Yang et al, 2001).…”

Section: Introductionmentioning

confidence: 82%

Dynamics of zinc uptake and accumulation in the hyperaccumulating and non-hyperaccumulating ecotypes of Sedum alfredii Hance

Yang

Xin

et al. 2006

Plant Soil

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Sedum alfredii Hance has been identified as a Zn-hyperaccumulating plant species native to China. The characteristics of Zn uptake and accumulation in the hyperaccumulating ecotype (HE) and non-hyperaccumulating ecotype (NHE) of S. alfredii were investigated under nutrient solution and soil culture conditions. The growth of HE was normal up to 1000 lM Zn in nutrient solution, and 1600 mg Zn kg )1 soil in a Zn-amended soil. Growth of the NHE was inhibited at Zn levels ‡250 lM in nutrient solution. Zinc concentrations in the leaves and stems increased with increasing Zn supply levels, peaking at 500 and 250 lM Zn in nutrient solution for the HE and the NHE, respectively, and then gradually decreased or leveled off with further increase in solution Zn. Minimal increases in root Zn were noted at Zn levels up to 50 lM; root Zn sharply increased at higher Zn supply. The maximum Zn concentration in the shoots of the HE reached 20,000 and 29,000 mg kg )1 in the nutrient solution and soil experiments, respectively, approximately 20 times greater than those of the NHE. Root Zn concentrations were higher in the NHE than in the HE when plants were grown at Zn levels ‡50 lM. The time-course of Zn uptake and accumulation exhibited a hyperbolic saturation curve: a rapid linear increase during the first 6 days in the longterm and 60 min in the short-term studies; followed by a slower increase or leveling off with time. More than 80% of Zn accumulated in the shoots of the HE at half time (day 16) of the long-term uptake in 500 lM Zn, and also at half time (120 min) of the short-term uptake in 10 lM 65 Zn 2+ . These results indicate that Zn uptake and accumulation in the shoots of S. alfredii exhibited a down-regulation by internal Zn accumulated in roots or leaves under both nutrient solution and soil conditions. An altered Zn transport system and increased metal sequestration capacity in the shoot tissues, especially in the stems, may be the factors that allow increased Zn accumulation in the hyperaccumulating ecotype of S. alfredii.

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Section: Introductionmentioning

confidence: 82%

Dynamics of zinc uptake and accumulation in the hyperaccumulating and non-hyperaccumulating ecotypes of Sedum alfredii Hance

Yang

Xin

et al. 2006

Plant Soil

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“…Soil total and bioavailable Zn was positively correlated with plant Cd, as was soil total and bioavailable Cd with plant Zn. In a hydroponic culture, Yang et al (2004b) indicated that there existed synergistic interaction between Zn and Cd in S. alfredii when their supply levels were lower than critical toxic levels. Baker et al (1994) suggested that there were common mechanisms of absorption and transport of Zn and Cd existed in another Zn/Cd hyperaccumulator, T. caerulescens.…”

Section: Evects Of Soil Factors On Metal Accumulationmentioning

confidence: 97%

Metal accumulation and arbuscular mycorrhizal status in metallicolous and nonmetallicolous populations of Pteris vittata L. and Sedum alfredii Hance

et al. 2007

Planta

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Although Pteris vittata L. and Sedum alfredii Hance have been identified as an As hyperaccumulator and a Zn/Cd hyperaccumulator, respectively, for a few years, variations in metal accumulation among populations and their arbuscular mycorrhizal (AM) status have not been fully explored. Six populations of P. vittata and four populations of S. alfredii from southeast China were investigated. Up to 1,373 As, 680 Pb, 376 Zn, 4.8 Cd, 169 Cu mg kg(-1) in fronds of P. vittata and 358 As, 2,290 Pb, 23,403 Zn, 708 Cd, 342 Cu mg kg(-1 )in shoots of S. alfredii were detected. Constitutive properties of As and Zn hyperaccumulation in metallicolous populations of P. vittata and S. alfredii, respectively, were confirmed. However, Cd hyperaccumulation in S. alfredii varied among populations. The two hyperaccumulators varied in efficiency in taking up other heavy metals. Different metal tolerance strategies adopted by the two hyperaccumulators varied among plant species and metal species. Low to moderate levels of AM colonization in P. vittata (4.2-12.8%) and S. alfredii (8.5-45.8%) were observed at uncontaminated and metal-contaminated sites. The relationship between metal concentrations and AM colonization in the two hyperacumulators was also examined. The abundance of AM fungal spores ranged from 16 to 190 spores per 25 g soil. Glomus microaggregatum, Glomus mosseae, Glomus brohultii and Glomus geosporum were the most common species associated with both P. vittata and S. alfredii. To our knowledge, this is the first report of AM fungal status in rhizosphere of P. vittata and S. alfredii.

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“…Phytoextraction technology (plant hyperaccumulators alone) was adopted for the moderately contaminated soil. Moreover, As and Pb hyperaccumulator Pteris vittata (Chen et al, 2002a;Chen et al, 2002b;Ma et al, 2001;Wan et al, 2014) and Cd hyperaccumulator Sedum alfredii Hance (Long et al, 2009;Yang et al, 2004) were used in this type of soil. Intercropping system consisting of hyperaccumulators and cash crops with low HM accumulating abilities (Wang et al, 2015) were designed and established on the lowly contaminated soil to give the local farmers some income during remediation.…”

Section: Efficiency Of Phytoremediationmentioning

confidence: 99%

Cost–benefit calculation of phytoremediation technology for heavy-metal-contaminated soil

Wan

Lei

Chen

2016

Science of The Total Environment

298

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Heavy-metal pollution of soil is a serious issue worldwide, particularly in China. Soil remediation is one of the most difficult management issues for municipal and state agencies because of its high cost. A two-year phytoremediation project for soil contaminated with arsenic, cadmium, and lead was implemented to determine the essential parameters for soil remediation. Results showed highly efficient heavy metal removal. Costs and benefits of this project were calculated. The total cost of phytoremediation was US$75,375.2/hm 2 or US$37.7/ m 3 , with initial capital and operational costs accounting for 46.02% and 53.98%, respectively. The costs of infrastructures (i.e., roads, bridges, and culverts) and fertilizer were the highest, mainly because of slow economic development and serious contamination. The cost of phytoremediation was lower than the reported values of other remediation technologies. Improving the mechanization level of phytoremediation and accurately predicting or preventing unforeseen situations were suggested for further cost reduction. Considering the loss caused by environmental pollution, the benefits of phytoremediation will offset the project costs in less than seven years.

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Uptake and Accumulation of Cadmium and Zinc by Sedum Alfredii Hance at Different Cd/Zn Supply Levels

Cited by 10 publications

References 0 publications

Dynamics of zinc uptake and accumulation in the hyperaccumulating and non-hyperaccumulating ecotypes of Sedum alfredii Hance

Dynamics of zinc uptake and accumulation in the hyperaccumulating and non-hyperaccumulating ecotypes of Sedum alfredii Hance

Metal accumulation and arbuscular mycorrhizal status in metallicolous and nonmetallicolous populations of Pteris vittata L. and Sedum alfredii Hance

Cost–benefit calculation of phytoremediation technology for heavy-metal-contaminated soil

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