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http://dx.doi.org/10.5352/JLS.2022.32.3.202

Isolation and Characterization of the Indigenous Microalgae Chlamydomonas reinhardtii K01 as a Potential Resource for Lipid Production and Genetic Modification  

Kim, Eun-Kyung (Korea Research Institute of Bioscience and Biotechnology Cell Factory Research Center)
Cho, Dae Hyun (Korea Research Institute of Bioscience and Biotechnology Cell Factory Research Center)
Suh, Sang-Ik (Department of Environmental Engineering, Gyeongsang National University)
Lee, Chang-Jun (Department of Environmental Engineering, Gyeongsang National University)
Kim, Hee-Sik (Korea Research Institute of Bioscience and Biotechnology Cell Factory Research Center)
Suh, Hyun-Hyo (Department of Environmental Engineering, Gyeongsang National University)
Publication Information
Journal of Life Science / v.32, no.3, 2022 , pp. 202-209 More about this Journal
Abstract
The green alga Chlamydomonas reinhardtii, a unicellular haploid eukaryote, has long been used by researchers and industries as a cell factory to produce high value-added microalgae substances using genetic modification. Microalga K01, presumed to be Chlamydomonas, was isolated from 12 freshwater samples from the Chungcheong and Jeolla regions to replace C. reinhardtii, an introduced species currently used in most basic and industrial research. The isolated K01 strain was identified as C. reinhardtii through morphological and phylogenetic studies of the 18S rDNA gene sequence (NCBI accession number KC166137). The growth and lipid content of the isolated C. reinhardtii K01 were compared with three wild and four mutant strains in TAP medium, and it was found that the K01 strain could produce 1.74×107 cells/ml by the third day of culture. The growth rate of C. reinhardtii K01 was 1.5 times faster than UTEX2244, which showed the highest number of cells (1.20×107 cells/ml) among the compared strains. The lipid content of the isolated C. reinhardtii K01 (20.67%) was similar to those of the wild strains, although the fatty acid oleate C18:1 was not detected in the isolated strain but was identified in the seven others. The cell density of the isolated strain increased to 0.87 g/l during a six-day culture in BG11 medium, where nitrate (NaNO3) was introduced as a nitrogen source, while the seven acquired strains showed almost no cell proliferation.
Keywords
Chlamydomonas reinhardtii; cell growth; FAME composition; lipid contents; microalgae;
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