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Effects of root anatomy and Fe plaque on arsenic uptake by rice seedlings grown in solution culture |
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| Authors: | Dan Deng Sheng-Chun Wu Hong Deng Ming-Hung Wong |
| Institution: | a Department of Environmental Sciences, East China Normal University, Shanghai, PR China b Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Hong Kong, PR China c Tiantong National Station of Forest Ecosystem, Key Laboratory of Urbanization and Ecological Restoration, East China Normal University, Shanghai 200062, PR China |
| Abstract: | Hydroponic experiments were carried out to investigate the effects of root anatomy, induced by aeration and stagnation, and Fe plaque on arsenic (III&V) uptake and translocation by rice plants. The results showed that As uptake in rice plants (Gui Chao-2) treated by aeration was decreased due to lower root specific surface area. Rice roots with larger specific surface area tended to form more Fe plaque, and Fe plaque affected As uptake kinetics by changing As influx curves from linear to hyperbolic for As(III) and from hyperbolic to S-curve for As(V). Fe plaque increased As(III&V) adsorption and minimized the effects of root anatomy characteristics on As uptake into roots and subsequently translocation to shoots. Fe plaque increased As(III) uptake rate at As(III) concentrations of 0.5∼8 mg L−1, reduced As(V) uptake rate at low As(V) concentrations (<2 mg L−1), but increased As uptake rate at high As(V) concentrations (>6 mg L−1). |
| Keywords: | Root anatomy Fe plaque Arsenic Rice |
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