Pb uptake,accumulation, subcellular distribution in a Pb-accumulating ecotype of<Emphasis Type="Italic">Sedum alfredii</Emphasis> (Hance) |
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Authors: | Email author" target="_blank">He?Bing?Email author Yang?Xiao-e Ni?Wu-zhong Wei?You-zhang Ye?Hai-bo |
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Institution: | (1) Department of Resource Science, College of Environmental and Resource Science, Zhejiang University, 310029 Hangzhou, China;(2) College of Agriculture, Guangxi University, 530005 Nanning, China |
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Abstract: | Lead concentrations in roots, stems and leaves of accumulating and non-accumulating ecotypes ofSedum alfredii (Hance) were studied through a hydroponic experiment with different Pb concentrations supplied as Pb(NO3)2. Lead concentrations in leaves and stems of the accumulating ecotype were 4–9 times and 3–5 times those of the non-accumulating
ecotype, and Pb-accumulated amounts in stems and leaves of the accumulating ecotype were 4–9 times and 8–11 times higher than
those of the non-accumulating ecotype, respectively. The results indicated that the accumulating ecotype had better ability
to transport Pb from roots to shoots. The subcellular distributions of Pb in the root, stem and leaf tissues were studied
using sucrose differential centrifugation. Approximately 50% of Pb contents was found to be associated with the cell wall
fraction in stems of the accumulating ecotype and the percentage increased to 80% both in roots and leaves, no matter when
plants were grown with different levels of Pb. The results indicated that the distribution of Pb on cell walls of the accumulating
ecotype could mainly account for the high tolerance to Pb.
Project supported by a Key Project from the Educational Ministry of China (No:02180) and by the Outstanding Young Scientist
Grant from the National Natural Science Foundation of China (No: 39925024). |
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Keywords: | Pb Accumulating ecotype Subcellular distribution |
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