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 indifferent wetland plants were investigated based on a hydroponic experiment (control, 0.8, 1.6mg AsL1) and a soil pot trail (control, 60mg Askg1). The results revealed that wetland plants showed great differences in root porosity (964%), rates of ROL (551750mmo1 O2kg1 root d.w.d1), As uptake (e.g., 8.8151mgkg1 in shoots in 0.8mg AsL1 treatment), translocation factor (2.147% in 0.8mg AsL1) and tolerance (29106% in 0.8mg AsL1). 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.
Environmental Pollution – Elsevier
Published: Jan 1, 2011
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