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

Yang, X.E. and Ye, H.B. and Long, X.X. and He, B. and Stoffella, P.J. and Calvert, D.V. (2004) Uptake and Accumulation of Cadmium and Zinc by Sedum Alfredii Hance at Different Cd/Zn Supply Levels. Journal of Plant Nutrition , 27 (11). pp. 1163-1977.

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Sedum alfredii Hance has been identified to be a zinc (Zn) hyperaccumulating plant species native to China. In this study, growth responses, uptake and accumulation of cadmium (Cd) and Zn by S. alfredii were examined at Cd/Zn combining supply levels. The results showed that optimal growth for both shoots and roots was found when the plant grew at the Cd/Zn level of 100/500 μmol L−1. The concentrations of Cd and Zn in leaves and Sstems of Sedum afredii H increased with increasing Cd and Zn supply levels. The distributions of the metals in different plant parts decreased in the order: stem > leaf root for Zn and leaf > stem root for Cd. The highest concentrations of Zn (23.2 mg g−1) in the stems and Cd (12.1 mg g−1) in the leaves were noticed when the plants were grown at the Zn/Cd levels of 1000/50 and 500/400 μmol L−1, respectively. The maximum Cd and Zn accumulations in the shoots were 5.1 and 11.2 mg plant−1 at the Cd/ Zn combining levels of 400/250 and 100/500 μmol L−1, respectively. Zinc supply levels <500 μmol L−1 enhanced Cd concentrations in stems and leaves at the Cd levels <100 μmol L−1 and Cd concentration in roots at the Cd levels <50 μmol L−1. Cadmium at the supply levels ≥100 μmol L−1 decreased considerably root Zn concentrations for all the Zn levels, slightly increased leaf Zn concentrations at the Zn levels ≥250 μmol L−1, but had minimal effect on leaf Zn concentrations at the Zn levels ≥500 μmol L−1. The results indicate that S. Alfredii has an extraordinary ability to co-tolerate Cd/Zn toxicities, and to absorb and hyper-accumulate Cd and Zn under a range of Cd/Zn combining levels. Zinc addition at relatively low levels could stimulate Cd uptake and translocation, whereas Cd supply enhanced Zn translocation and partition to the shoots. Sedum alfredii is a Zn/Cd hyperaccumulator, which can be a valuable material for further study on the mechanisms of metal uptake and accumulation and for phytoremediation of the soils with Zn/Cd combined contamination.

Item Type: Article
Author Affiliation: Zhejiang University, College of Environment and Resource Science, Huajianchi Campus, Hanghzou, China, University of Florida, Indian River Research and Education Center, Fort Pierce, Florida, USA
Subjects: Soil Science and Microbiology
Crop Improvement
Divisions: General
Depositing User: Mr. SanatKumar Behera
Date Deposited: 03 Sep 2012 08:04
Last Modified: 03 Sep 2012 08:06
Official URL: http://dx.doi.org/10.1081/PLN-200030082
URI: http://eprints.icrisat.ac.in/id/eprint/7656

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