Cited by 61Algal biology and biofuel productionLipid metabolism and biosynthesisMicrobial Metabolic Engineering and Bioproduction

Enhanced Lipid Production and Molecular Dynamics under Salinity Stress in Green Microalga Chlamydomonas reinhardtii (137C)

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Atikij, Thanapa, Syaputri, Yolani, Iwahashi, Hitoshi, Praneenararat, Thanit, Sirisattha, Sophon, Kageyama, Hakuto, Waditee-Sirisattha, Rungaroon·2019·Marine Drugs

Abstract

Microalgal lipids are a source of valuable nutritional ingredients in biotechnological industries, and are precursors to biodiesel production. Here, the effects of salt-induced stresses, including NaCl, KCl, and LiCl stresses, on the production of lipid in green microalga Chlamydomonas reinhardtii (137c) were investigated. NaCl stress dramatically increased saturated fatty acids (SFAs), which accounted for 70.2% of the fatty acid methyl ester (FAMEs) under stress. In contrary, KCl stress led to a slight increase in SFAs (47.05%) with the remaining being polyunsaturated fatty acids (PUFAs) (45.77%). RT-PCR analysis revealed that the genes involved in FA biosynthesis, such as PDH2, ACCase, MAT and KAS2, were up-regulated by NaCl-induced stress. Conversely, the genes responsible for the Kennedy pathway were suppressed. The alteration of FA homeostasis was further assessed by overexpressing MAT, the enzyme responsible for the production of malonyl-ACP, a key building block for FA biosynthesis, in the cyanobacterium Synechococcus elongatus PCC 7942. Intracellular FA composition was affected, with a predominant synthesis of SFAs in transformed cells. Owing to the diversity and relative abundance of SFAs, monounsaturated fatty acid (MUFAs) and PUFAs enable the feasibility of using microorganisms as a source of microalgal lipids or valuable nutritional ingredients; salt-induced stress and expression of MAT are useful in providing precursors for enhanced lipid production.

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  • Although some microalgae showed an increase in MUFA, most microalgae still showed an increase in SFA after high concentration NaCl treatments.

    “Although some microalgae showed an increase in MUFA, most microalgae still showed an increase in SFA after high concentration of NaCl treatments [128, 129, 133].”

    From Microalgae biofuels: illuminating the path to a sustainable future amidst challenges and opportunities (2024) · cites this paper as [133]

    Section 2.2 reports that SFA increased under 200 mM NaCl in C. reinhardtii, while MUFA remained unchanged. It also reports a MUFA increase in Dunaliella under NaCl stress. These examples support the contrasting responses, but the paper does not establish that most microalgae increase SFA after high-concentration NaCl treatment. Page numbers are not provided in our copy. (LLM, conf=0.86)

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Research works printed but not linked: 2

  1. [17]Harris E.H. The Chlamydomonas Sourcebook: Introduction to Chlamydomonas and Its Laboratory Use 2nd ed. Academic Press New York, NY, USA 2009
  2. [36]Sambrook J. Fritsch E.F. Maniatis T. Molecular Cloning: A Laboratory Manual 2nd ed. Cold Spring Harbor Laboratory Press New York, NY, USA 1989

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Authors
Atikij, T., Syaputri, Y., Iwahashi, H., Praneenararat, T., Sirisattha, S., Kageyama, H., & Waditee-Sirisattha, R.
Affiliations
  • Chulalongkorn University (TH)
  • Gifu University (JP)
  • Thailand Institute of Scientific and Technological Research (TH)
  • Meijo University (JP)
  • Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Rd., Pathumwan, Bangkok 10330, Thailand
Corresponding author
Kageyama, Hakuto
Venue
Marine Drugs
Publisher
MDPI AG
Published
2019-08-20
Volume
17
Issue
8
Pages
484
ISSN
1660-3397 (ISSN-L)
OpenAlex
W2969920282
Cited by
61
References
34
Citations by year
2026: 11 · 2025: 7 · 2024: 10 · 2023: 5 · 2022: 11 · 2021: 9 · 2020: 8
FWCI
1.49
Type
journal article
Language
en
Open access
Locations
  • Marine Drugs (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Chulalongkorn University
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
Keywords
Chlamydomonas reinhardtii, microalgal lipid production, salt stress, NaCl stress, saturated fatty acids, fatty acid synthesis, Kennedy pathway, fatty acid homeostasis, fatty acid methyl esters, biodiesel precursors, Synechococcus elongatus PCC 7942, fatty acid composition
MeSH terms
Salt Stress, Fatty Acids, Fatty Acids, Unsaturated, Lipids, Sodium Chloride, Chlamydomonas reinhardtii, Lipid Metabolism, Microalgae

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