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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Abstract
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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