Abstract
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, 1.6mg AsL−1) and a soil pot trail (control, 60mg Askg−1). The results revealed that wetland plants showed great differences in root porosity (9–64%), rates of ROL (55–1750mmo1 O2kg−1 root d.w.d−1), As uptake (e.g., 8.8–151mgkg−1 in shoots in 0.8mg AsL−1 treatment), translocation factor (2.1–47% in 0.8mg AsL−1) and tolerance (29–106% in 0.8mg AsL−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.
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