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The Effect of Chromium on Photosynthesis and Lipid Accumulation in Two Chlorophyte Microalgae

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  • Khawaja Muhammad Imran Bashir

    (German Engineering Research and Development Center, LSTME-Busan, Busan 46742, Korea)

  • Hyeon-Jun Lee

    (Department of Chemical and Biological Engineering, Institute of Fluid Mechanics, Friedrich-Alexander-Universität Erlangen-Nürnberg Busan Campus, Busan 46742, Korea)

  • Sana Mansoor

    (Department of Environmental Engineering, College of Engineering, Dong-A University, Busan 49315, Korea)

  • Alexander Jahn

    (German Engineering Research and Development Center, LSTME-Busan, Busan 46742, Korea)

  • Man-Gi Cho

    (Department of Biotechnology, Division of Energy and Bioengineering, Dongseo University, Busan 47011, Korea)

Abstract

Heavy metals have adverse effects on microalgae metabolism and growth. Photosynthesis and lipid profile are quite sensitive to heavy metal toxicity. The impact of hexavalent chromium—Cr(VI) on photosynthesis and lipid accumulation in Mucidosphaerium pulchellum and Micractinium pusillum exposed to different concentrations (0–500 μg L −1 ) was investigated for 11 days. A significant ( p < 0.05) increase in lipid content was observed with increasing Cr(VI) concentration. However, growth was suppressed at higher concentrations exceeding 100 μg L −1 . Addition of Cr(VI) in the cell culture medium showed a negative effect on quantum yield ( F v /F m ), and a photosynthetic inhibition of >65% was noted in both species at 500 μg L −1 . However, the lipid gravimetric analysis presented inner cell lipid content up to 36% and 30% of dry weight biomass for M. pulchellum and M. pusillum, respectively. The fatty acids profiles of both microalgae species showed higher levels of hexadecenoic acid as well as ω3, ω6, and ω7 fatty acids. The effect of Cr(VI) on photosynthesis and lipid accumulation in both microalgae species was concentration and exposure time dependent. This shows that an appropriate concentration of Cr(VI) in culture medium could be beneficial for higher lipid accumulation in freshwater eukaryotic microalgae species.

Suggested Citation

  • Khawaja Muhammad Imran Bashir & Hyeon-Jun Lee & Sana Mansoor & Alexander Jahn & Man-Gi Cho, 2021. "The Effect of Chromium on Photosynthesis and Lipid Accumulation in Two Chlorophyte Microalgae," Energies, MDPI, vol. 14(8), pages 1-11, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2260-:d:538089
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    References listed on IDEAS

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    1. Mei An & Li Gao & Wen Zhao & Weiguang Chen & Ming Li, 2020. "Effects of Nitrogen Forms and Supply Mode on Lipid Production of Microalga Scenedesmus obliquus," Energies, MDPI, vol. 13(3), pages 1-13, February.
    2. Małgorzata Hawrot-Paw & Adam Koniuszy & Małgorzata Gałczyńska, 2020. "Sustainable Production of Monoraphidium Microalgae Biomass as a Source of Bioenergy," Energies, MDPI, vol. 13(22), pages 1-13, November.
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