Impacts of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms

Hanhua Hu; Kunshan Gao

doi:10.1007/s00343-008-0407-7

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Impacts of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms

Updated：2023-05-16

- Impacts of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms
- Journal of Oceanology and Limnology Vol. 26, Issue 4, Pages: 407-414(2008)
- Affiliations：
  
  1. State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences
  2. Marine Biology Institute Shantou University
- Author bio：
- Funds：
- DOI：10.1007/s00343-008-0407-7
  CLC：
- Online First：23 January 2009，
  
  Published：2008
- Accepted：
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Hu, H., Gao, K. Impacts of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms., Chin. J. Ocean. Limnol. 26, 407–414 (2008). https://doi.org/10.1007/s00343-008-0407-7
DOI：

Hu, H., Gao, K. Impacts of CO2 enrichment on growth and photosynthesis in freshwater and marine diatoms., Chin. J. Ocean. Limnol. 26, 407–414 (2008). https://doi.org/10.1007/s00343-008-0407-7 DOI：

摘要

Abstract

The physiological responses of Nitzschia palea Kützing

a freshwater diatom

to elevated CO2 were investigated and compared with those of a marine diatom

Chaetoceros muelleri Lemmermann previously reported. Elevated CO2 concentration to 700 μl/L increased the dissolved inorganic carbon (DIC) and lowered the pH in the cultures of N. palea

thus enhancing the growth by 4%–20% during the whole growth period. High CO2-grown N. palea cells showed lower levels of dark respiration rates and higher I k values. Light-saturated photosynthetic rates and photosynthetic efficiencies decreased in N. palea with the doubling CO2 concentration in airflow to the bottom of cultures

although the doubling CO2 concentration in airflow to the surface cultures had few effects on these two photosynthetic parameters. N. palea cells were found to be capable of using HCO 3 − in addition to gaseous CO2

and the CO2 enrichment decreased their affinity for HCO 3 − and CO2. Although doubled CO2 level would enhance the biomass of N. palea and C. muelleri to different extents

compared with the marine diatom

it had a significant effect on the specific growth rates of N. palea. In addition

the responses of photosynthetic parameters of N. palea to doubled CO2 concentration were almost opposite to those of C. muelleri.

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Keywords

references

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