KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Response of cellular stoichiometry and phosphorus storage of the cyanobacteria Aphanizomenon flos-aquae to small-scale turbulence | |
Li Zhe ; Xiao Yan; Yang Jixiang; Li Chao; Gao Xia; Guo Jinsong
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| 2017 | |
| 摘要 | Turbulent mixing, in particular on a small scale, affects the growth of microalgae by changing diffusive sublayers and regulating nutrient fluxes of cells. We tested the nutrient flux hypothesis by evaluating the cellular stoichiometry and phosphorus storage of microalgae under different turbulent mixing conditions. Aphanizomenon flos-aquae were cultivated in different stirring batch reactors with turbulent dissipation rates ranging from 0.001 51 m(2)/s(3) to 0.050 58 m(2)/s(3), the latter being the highest range observed in natural aquatic systems. Samples were taken in the exponential growth phase and compared with samples taken when the reactor was completely stagnant. Results indicate that, within a certain range, turbulent mixing stimulates the growth of A. flos-aquae. An inhibitory effect on growth rate was observed at the higher range. Photosynthesis activity, in terms of maximum effective quantum yield of PSII (the ratio of F-v/F-m) and cellular chlorophyll a, did not change significantly in response to turbulence. However, Chl a/C mass ratio and C/N molar ratio, showed a unimodal response under a gradient of turbulent mixing, similar to growth rate. Moreover, we found that increases in turbulent mixing might stimulate respiration rates, which might lead to the use of polyphosphate for the synthesis of cellular constituents. More research is required to test and verify the hypothesis that turbulent mixing changes the diffusive sublayer, regulating the nutrient flux of cells. |
| DOI | 10.1007/s00343-017-6178-2 |
| 发表期刊 | CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
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| ISSN | 0254-4059 |
| 卷号 | 35期号:6页码:1409-1416 |
| 通讯作者 | Xiao, Y (reprint author), Chinese Acad Sci, CAS Key Lab Reservoir Water Environm, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China. |
| 收录类别 | SCI |
| WOS记录号 | WOS:000415810900012 |
| 语种 | 英语 |
