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Zinc distribution and ultrastructural change of cells in Sedum alfredii Hance from two ecotypes(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2005 Vol.11 No.5
Page:
536-541
Research Field:
Reviews
Publishing date:

Info

Title:
Zinc distribution and ultrastructural change of cells in Sedum alfredii Hance from two ecotypes
Author(s):
LONG Xinxianet al.
(1College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China) ( 2Department of Geography, South China Normal University, Guangzhou 510631, China) ( 3Centre for Ecological and Environmental Technologies, South China Agricultural University, Guangzhou 510642, China)
Keywords:
Keywords Sedum alfredii Hance zinc hyperaccumulation ultrastructure ecotype
CLC:
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PACS:
DOI:
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DocumentCode:

Abstract:
Abstract Growth experiment using Zncontaining nutrient solutions was conducted to examine the distribution of Zn and ultrastructural change of cells in Sedum alfredii Hance from two ecotypes ( Zn hyperaccumulating and nonhyperaccumulating ecotypes). The results showed that for Zn hyperaccumulating ecotype under 500 μmol L-1 Zn treatment, the ratio of Zn concentration of the younger leaf to that of the older leaf and the ratio of Zn concentration in the younger portion of stem to that in older portion was 1.47~1.67 and 1.81~2.11, respectively. However, for non hyperaccumulating ecotype, Zn concentration of the younger leaf or the younger portion of stem was always higher than that of the older leaf or the older portion of stem under 100 μmol L-1 Zn treatment. Electron microscopy showed that there were some granular substances in the cells of leaf and stem. This suggests that compartmentalization of Zn by vacuole may be an important mechanism through which the hyperaccumulating ecotype of S. alfredii Hance develops Zn tolerance and strong capacity for Zn hyperaccumulation. Fig 2, Tab 2, Ref 19

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Last Update: 2005-10-27