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

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Abstract

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 μM 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 μM in nutrient solution. Zinc concentrations in the leaves and stems increased with increasing Zn supply levels, peaking at 500 and 250 μM 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 μM; 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 μM. The time-course of Zn uptake and accumulation exhibited a hyperbolic saturation curve: a rapid linear increase during the first 6 days in the long-term 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 μM Zn, and also at half time (120 min) of the short-term uptake in 10 μM 65Zn2+. 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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Authors and Affiliations

  1. MOE Key Lab of Environmental Remediation and Ecological Health, College of Natural Resources and Environmental Science, Zhejiang University, Huajiachi Campus, Keichun Road 268, 310029, Hangzhou, China

    X. E. Yang, T. Q Li, X. X. Long & Y. H. Xiong

  2. IFAS, Indian River Research & Education Center, University of Florida, Fort Pierce, FL, 34945, USA

    Z. L. He & P. J. Stoffella

Authors
  1. X. E. Yang
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  2. T. Q Li
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  3. X. X. Long
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  4. Y. H. Xiong
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  5. Z. L. He
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  6. P. J. Stoffella
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Correspondence to X. E. Yang.

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Section Editor: F. J. Zhao

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Yang, X.E., Li, T.Q., Long, X.X. et al. Dynamics of zinc uptake and accumulation in the hyperaccumulating and non-hyperaccumulating ecotypes of Sedum alfredii Hance. Plant Soil 284, 109–119 (2006). https://doi.org/10.1007/s11104-006-0033-0

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  • DOI: https://doi.org/10.1007/s11104-006-0033-0

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