Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 189, Issue 1-2, Pages 414-419Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.02.053
Keywords
Solanum photeinocarpum; Heavy metals; Soil seed bank; Remediation; Physiology
Categories
Funding
- National Natural Science Foundation of China [40871221]
- Core Project of National High-tech R&D Program (863 Program) [2007AA061001]
- Natural Science Foundation of Guangdong [9151001002000001]
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A new method, soil seed bank-metal concentration gradient method was used to screen for heavy metal hyperaccumulators, and Solanum photeinocarpum was found to be a potential Cd-hyperaccumulator. The chlorophyll content and photosynthetic rate of S. photeinocarpum were not affected by Cd pollution, while leaf stomas and transpiration rate were significantly decreased by more than 60 mg kg(-1) Cd, and leaf water use efficiency and shoot water content were significantly increased by more than 60 or 100 mg kg(-1) Cd, respectively. In the seed bank-Cd concentration gradient experiment, the shoot biomass of S. photeinocarpum showed no significant reduction with soil Cd treatment as high as 100 mg kg(-1), but the root biomass was significantly reduced by more than 60 mg kg(-1) Cd contamination. Plant tissues accumulated 544, 132 and 158 mg kg Cd in roots, stems and leaves, respectively, and extracted 157 and 195 mu g Cd plant(-1) in roots and shoots at 100 mg kg(-1) Cd in soil, respectively. In the transplanting-Cd concentration gradient experiment, plant shoot biomass and root biomass were unaffected by soil Cd as high as 60 mg kg(-1). Plant tissues accumulated 473, 215 and 251 mg kg(-1) Cd in roots, stems and leaves, respectively, and extracted 176 and 787 jig Cd plant(-1) in roots and shoots at 60 mg kg(-1) soil Cd, respectively. Soil seed bank-metal concentration gradient method could be an effective method for the screening of hyperaccumulators. (C) 2011 Elsevier B.V. All rights reserved.
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