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| Phosphorus assimilation process by dominant algaespecies in Chinesecoastal sea |
| QU Ying-xue1, JIN Jie2, XU Wen-qi1, LIU Su-mei1,3 |
1. Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. State Key Laboratory of Estuary and Coastalology, East China Normal University, Shanghai 200062;
3. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China |
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Abstract The growth of algaes and the response of cell-bound phosphorus to phosphate were studied by the field sampling and indoor culture experiments. The cell-bound phosphorus pool of phytoplankton from the bloom station and non-bloom station were different. The maximum P-Uptake rates of Skeletonema costatum and Prorocentrum donghaiensis were 7.71 and 2.39μmol/(L·d),the maximum specific growth rates of themwere 0.517 and 0.262d-1, the P-assimilation rates of them were 5.9×10-8 and 4.7×10-7μmol/cell, respectively. S. costatum showed higher P-Uptake capacity,faster specific growth rate and lower P-assimilation rate compared with P. donghaiensis during the incubation period. The intracellular phosphorus, which is the main form of cell phosphorus pool, usually accounts for more than 50% of total cellular phosphorus pool. The S.costatum could utilize phosphorus from the environment by cell multiplication. While P.donghaiensis preferentially satisfied the phosphorus storage in cells. The contents of cell associated phosphorus in the cell of P.donghaiensis could reach saturation in phosphorus rich waters. When phosphorus was deficient, the mass concentration of intracellular phosphorus in S.costatum and P.donghaiensis decreased by 45% and 66%, respectively, compared with the start of the experiment. During the culturing, the cell surface-adsorbed phorsphous(95%) of the single cell of S.costatum decreased more than intracellular phosphorus(50%), while P.donghaiensiswas different from it.
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Received: 13 August 2019
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