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Science China Earth Sciences

, Volume 61, Issue 10, pp 1397–1405 | Cite as

Differential physiological responses of the coastal cyanobacterium Synechococcus sp. PCC7002 to elevated pCO2 at lag, exponential, and stationary growth phases

  • Shanli Mou
  • Gang Li
  • Hongmei Li
  • Fazhong Li
  • Zhisheng Shao
  • Jinsong Li
  • Changfeng Qu
  • Yongyu Zhang
Research Paper
  • 16 Downloads

Abstract

We studied the effects of expected end-of-the-century pCO2 (1000 ppm) on the photosynthetic performance of a coastal marine cyanobacterium Synechococcus sp. PCC7002 during the lag, exponential, and stationary growth phases. Elevated pCO2 significantly stimulated growth, and enhanced the maximum cell density during the stationary phase. Under ambient pCO2 conditions, the lag phase lasted for 6 days, while elevated pCO2 shortened the lag phase to two days and extended the exponential phase by four days. The elevated pCO2 increased photosynthesis levels during the lag and exponential phases, but reduced them during the stationary phase. Moreover, the elevated pCO2 reduced the saturated growth light (Ik) and increased the light utilization efficiency (α) during the exponential and stationary phases, and elevated the phycobilisome:chlorophyll a (Chl a) ratio. Furthermore, the elevated pCO2 reduced the particulate organic carbon (POC):Chl a and particulate organic nitrogen (PON):Chl a ratios during the lag and stationary phases, but enhanced them during the exponential phase. Overall, Synechococcus showed differential physiological responses to elevated pCO2 during different growth phases, thus providing insight into previous studies that focused on only the exponential phase, which may have biased the results relative to the effects of elevated pCO2 in ecology or aquaculture.

Keywords

Elevated pCO2 Lag Exponential and stationary phases Photosynthetic performance Synechococcus 

Notes

Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFA0601402), the China SOA Grant Associated with Task (Grant No. GASI-03-01-02-05), the CNOOC Zhanjiang Branch (Grant No. CNOOC-KJ 125 FZDXM 00 ZJ 001-2014), the National Natural Science Foundation of China (Grant Nos. 41606092 & 41676156). This study is a contribution to the international IMBER project.

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Shanli Mou
    • 1
  • Gang Li
    • 1
    • 2
  • Hongmei Li
    • 1
  • Fazhong Li
    • 3
  • Zhisheng Shao
    • 3
  • Jinsong Li
    • 3
  • Changfeng Qu
    • 4
  • Yongyu Zhang
    • 1
  1. 1.Key Laboratory of Biofuels, Shandong Provincial Key Laboratory of Energy Genetics, Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdaoChina
  2. 2.Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhouChina
  3. 3.Zhanjiang Branch of China National Offshore Oil Corporation Ltd.ZhanjiangChina
  4. 4.Key Laboratory of Marine Bioactive Substance, the First Institute of OceanographyState Oceanic AdministrationQingdaoChina

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