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《植物学报(英文版)》 2003-09
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Growth Response and Metal Accumulation of Sedum alfredii to Cd/Zn Complex-Polluted Ion Levels

YE Hai-Bo1, YANG Xiao-E1*, HE Bing1, 2, LONG Xin-Xian1, SHI Wei-Yong1(1.College of Natural Resources and Environmental Sciences, Zhejiang University, Hangzhou 310029, China;2. College of Agriculture, Guangxi University, Nanning 530005, China)  
Sedum alfredii Hance has been identified as a new Zn-hyperaccumulator native to China. Inthis study, responses and metal accumulation of S. alfredii were examined under Zn/Cd complex pollutedconditions. The results showed that optimal growth of S. alfredii in terms of the maximum dry matter yieldwas observed at Zn/Cd complex level of 500/100 祄ol/L. Plant cadmium (Cd) or zinc (Zn) concentrationsincreased with increasing Cd or Zn supply. During the 20 d treatment, the highest Cd concentration in theleaves reached 12.1 g/kg at Zn/Cd level of 50/400 祄ol/L and that of Zn in the stems was 23.2 g/kg atZn/Cd level of 1 000/50 祄ol/L. The distribution of Cd in different plant parts decreased in the order: leaf stem≥ root, whereas that of Zn was: stem leaf ≥ root. The accumulation of Cd and Zn in theshoots and roots of S. alfredii increased with the increasing of Zn/Cd supply levels, peaked at Zn/Cd levelsof 250/400 and 500/100 祄ol/L, respectively. The highest Cd and Zn uptake by the shoots was approxi-mately 5 and 11 mg/plant, and was over 20 and 10 times higher than those in the roots, respectively. Znsupply at levels ≤ 500 祄ol/L increased plant Cd concentrations, whereas high Zn supply decreased rootCd but did not affect leaf Cd concentrations in S. alfredii. Low Cd supply increased Zn concentration in theleaves, but Cd supply higher than 50 祄ol/L considerably reduced root Zn concentrations, especially atlow Zn level. These results indicate that S. alfredii can tolerate high Zn/Cd complex levels and has anextraordinary ability to hyperaccumulate not only Zn but also Cd. It could provide a new valuable plantmaterial for understanding the mechanisms responsible for co-hyperaccumulation of Zn and Cd as well asfor phytoremediation of the Cd/Zn complex polluted soils.
【Fund】: 国家自然科学基金(20277035);; 国家重大基础研究和发展规划项目(2002CB410804)。~~
【CateGory Index】: Q945
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