Growth characteristics and fatty acids of the thermotolerant green alga Desmodesmus sp. isolated from a freshwater puddle in Ibaraki, Japan

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  • Ishikawa-Ishiwata Yuki
    Global and Local Environment Co-creation Institute, Ibaraki University Vietnam Japan University
  • Nosaka Yuichi
    Research Center for Creative Partnerships, Ishinomaki Senshu University Department of Marine Biology and Sciences, School of Biological Sciences
  • Usui Toshinori
    Research Center for Creative Partnerships, Ishinomaki Senshu University Okinawa Life Science Research Center, 118 ABCRUX BioFactory Inc.
  • Sasaki Hiroshi
    Department of Biological Engineering, Faculty of Science and Engineering, Ishinomaki Senshu University

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タイトル別名
  • Growth characteristics and fatty acids of the thermotolerant green alga <i>Desmodesmus</i> sp. isolated from a freshwater puddle in Ibaraki, Japan

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<p>We investigated the growth, thermotolerance, and fatty acid composition of the green alga Desmodesmus sp., which was isolated from a freshwater puddle in Ibaraki, Japan. Incubation experiments on the isolated strain were performed at a range of temperatures (20–40°C) with continuous illumination (110 µmol photons m−2 s−1) and nutrient-replete medium. High specific growth rates of 1.14–1.62 day−1 were observed at 20–35°C, but growth rates declined to 0.59 day−1 at 40°C. Lipid contents were 13.2%–14.4% (% dry weight) at 20–35°C and increased to 21.3% at 40°C. Some microalgae are known to regulate membrane fluidity by changing their fatty acid compositions in response to changes in ambient temperature. We found that the major polyunsaturated fatty acid (PUFA; C18:3 ω3) of Desmodesmus sp. was negatively correlated with water temperature. By contrast, no significant relationship was identified between temperature and the ratio of saturated to unsaturated fatty acids. The negative relationship between ω3 PUFA composition and temperature was stronger among thermotolerant as opposed to non-thermotolerant microalgae. This suggests that thermotolerant Desmodesmus sp. can grow at high temperatures by altering its fatty acid composition to affect membrane fluidity.</p>

収録刊行物

  • Plankton and Benthos Research

    Plankton and Benthos Research 18 (2), 74-83, 2023-05-31

    日本プランクトン学会、日本ベントス学会

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