Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 71, Issue 2, Pages 198-206Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2010.12.002
Keywords
Cadmium; Eggplants; Root; Solanum melongena; Solanum torvum; Synchrotron micro X-ray fluorescence spectrometry
Categories
Funding
- Program for Promotion of Basic Research Activities for Innovative Biosciences (PROBRAIN)
- NIMS Nano Foundry
- CNN Nano Foundry
- United Analysis Facilities [AC210003]
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Root-to-shoot cadmium (Cd) translocation in Solanum torvum is lower than that of the eggplant Solanum melongena; therefore, grafting S. melongena onto S. torvum rootstock can effectively reduce the Cd concentration in eggplant fruits. We hypothesized that Cd transport in S. torvum roots is restricted in the path between the epidermis and xylem vessel; hence, we investigated the Cd distribution in the roots at the micron-scale. Elemental maps of Cd, Zn and Fe accumulation in S. melongena and S. torvum root sections were obtained by synchrotron micro X-ray fluorescence spectrometry. The Cd was localized in both the stele and the epidermis of the S. melongena root cross sections regardless of the distance from the root apex. In S. torvum root sections taken at 30 and 40 mm above the root apex, a higher abundance of Cd was found within the cells of the endodermis and pericycle. The results suggested that the symplastic uptake and xylem loading of Cd in S. torvum roots were restricted, and thereby, the Cd that was unable to be loaded into the xylem accumulated in the endodermis and in the pericycle. Because symplastic uptake differs only slightly between the two species, the difference in xylem loading would explain the comparatively lower Cd concentration in S. torvum shoots. (C) 2010 Elsevier B.V. All rights reserved.
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