A model and experimental study of phosphate uptake kinetics in algae:
Considering surface adsorption and P-stress |
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Authors: | Bo Yao Beidou Xi Chunming Hu Shouliang Huo Jing Su and Hongliang Liu |
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Institution: | 1. School of Environment, Beijing Normal University, Beijing 100875, China;Chinese Research Academy of Environmental Sciences, Beijing 100012, China 2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China 3. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;College of Life Science, Northeast Agriculture University, Harbin 150030, China |
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Abstract: | Phosphorus is an important limiting nutrient in many ecosystems. Consequently, there is increasing interest on phosphate uptake and
algal growth due to the increasing frequency and magnitude of algal blooms induced by eutrophication. The co-existence of surface
adsorbed and intracellular phosphorus pools indicate that phosphate uptake by phytoplankton is, to some extent, a two-stage kinetic
process. However, almost all previous uptake models considered the internal uptake stage only and ignored the possible impact of
surface adsoption. In this article, a two-stage kinetic uptake model considering both surface adsorption and P-stress on phosphate
uptake by algae was constructed and compared to conventional one-stage models, based on experimental data on short-term uptake
kinetics of a green algae S. quadricauda. Results indicated that with suitable parameters, the two-stage uptake model not only fit
the experimental data better, but also gave more reasonable and realistic explanations to the phosphate uptake process. The results
are meaningful as surface-adsorption of phosphate may a ect the uptake process of phosphate and assist in understanding realistic
phosphate uptake kinetics in phytoplankton. |
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Keywords: | phosphate uptake surface adsorption P-starvation phytoplankton |
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