Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 1, Pages 30-37Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2010.09.031
Keywords
Arsenic (As); Radial oxygen loss (ROL); Porosity (POR); Tolerance; Translocation factor
Categories
Funding
- Ministry of Education in Colleges and University, China [20558097]
- National Natural Science Fund of China [30570345, 30770417]
- NSFC-Guangdong United Foundation [U0833004]
- Research Grant Council Hong Kong [HKBU 261407]
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The rates of radial oxygen loss (ROL), root porosity, concentrations of arsenic (As), iron (Fe) and manganese (Mn) in shoot and root tissues and on root surfaces, As tolerances, and their relationships in different wetland plants were investigated based on a hydroponic experiment (control, 0.8, 1.6 mg As L-1) and a soil pot trail (control, 60 mg As kg(-1)). The results revealed that wetland plants showed great differences in root porosity (9-64%), rates of ROL (55-1750 mmol O-2 kg(-1) root d.w. d(-1)), As uptake (e.g., 8.8-151 mg kg(-1) in shoots in 0.8 mg As L-1 treatment), translocation factor (2.1-47% in 0.8 mg As L-1) and tolerance (29-106% in 0.8 mg As L-1). Wetland plants with higher rates of ROL and root porosity tended to form more Fe/Mn plaque, possess higher As tolerance, higher concentrations of As on root surfaces and a lower As translocation factor so decreasing As toxicity. (C) 2010 Elsevier Ltd. All rights reserved.
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