Light-dependent phosphate uptake of a submersed macrophyte Myriophyllum spicatum L. |
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Authors: | Meng Zhang Te Cao Leyi Ni Ping XieGuorong Zhu Aiwen ZhongJun Xu Hui Fu |
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Institution: | a Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, 7# Donghu South Road, Wuhan 430072, Hubei, PR China b Jiangxi Academy of Environmental Sciences, Nanchang 330029, PR China |
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Abstract: | The uptake kinetics of phosphate (Pi) by Myriophyllum spicatum was determined from adsorption and absorption under light and dark conditions. Pi uptake was light dependent and showed saturation following the Michaelis-Menten relation (in light: V = 16.91 × Pi](1.335 + Pi]), R2 = 0.90, p < 0.001; in the dark: V = 5.13 × Pi](0.351 + Pi]), R2 = 0.77, p < 0.001). Around 77% of the loss of Pi in the water column was absorbed into the tissue of M. spicatum, and only 23% was adsorbed on the surface of the plant shoots. Our study shows that M. spicatum shoots have a much higher affinity (in light: 3.9 μmol g−1 dw h−1 μM−1; in the dark: 3.7 μmol g−1 dw h−1 μM−1) and Vmax (maximum uptake rate, shoot light) for Pi uptake than many other aquatic macrophytes (in light: 0.002-0.23 μmol g−1 dw h−1 μM−1; in the dark: 0.002-0.19 μmol g−1 dw h−1 μM−1), which may provide a competitive advantage over other macrophytes across a wide range of Pi concentrations. |
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Keywords: | Submersed macrophyte Myriophyllum spicatum Phosphate absorption Phosphate adsorption |
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