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Journal of Zhejiang University SCIENCE A 2003 Vol.4 No.4 P.474~479

http://doi.org/10.1631/jzus.2003.0474


Pb uptake, accumulation, subcellular distribution in a Pb-accumulating ecotype of Sedum alfredii (Hance)


Author(s):  HE Bing, YANG Xiao-e, NI Wu-zhong, WEI You-zhang, YE Hai-bo

Affiliation(s):  Department of Resource Science, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   bingh2000@263.sina.com

Key Words:  Pb, Accumulating ecotype, Subcellular distribution


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HE Bing, YANG Xiao-e, NI Wu-zhong, WEI You-zhang, YE Hai-bo. Pb uptake, accumulation, subcellular distribution in a Pb-accumulating ecotype of Sedum alfredii (Hance)[J]. Journal of Zhejiang University Science A, 2003, 4(4): 474~479.

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author="HE Bing, YANG Xiao-e, NI Wu-zhong, WEI You-zhang, YE Hai-bo",
journal="Journal of Zhejiang University Science A",
volume="4",
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pages="474~479",
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%T Pb uptake, accumulation, subcellular distribution in a Pb-accumulating ecotype of Sedum alfredii (Hance)
%A HE Bing
%A YANG Xiao-e
%A NI Wu-zhong
%A WEI You-zhang
%A YE Hai-bo
%J Journal of Zhejiang University SCIENCE A
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%P 474~479
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.2003.0474

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T1 - Pb uptake, accumulation, subcellular distribution in a Pb-accumulating ecotype of Sedum alfredii (Hance)
A1 - HE Bing
A1 - YANG Xiao-e
A1 - NI Wu-zhong
A1 - WEI You-zhang
A1 - YE Hai-bo
J0 - Journal of Zhejiang University Science A
VL - 4
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SP - 474
EP - 479
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Y1 - 2003
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2003.0474


Abstract: 
Lead concentrations in roots, stems and leaves of accumulating and non-accumulating ecotypes of Sedum 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.

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