量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Microalgae are promising biofuel producers due to their high ability to produce oil photosynthetically. The oleaginous green alga Chlamydomonas sp. JSC4 is a hopeful candidate that shows high growth potential together with high oil content through activation of the starch-to-lipid biosynthesis switching mechanism. However, oil accumulation of JSC4 is significantly decreased under light/dark conditions, which is inevitable in large-scale outdoor cultivation. To overcome this critical obstacle, this study aimed to obtain a mutant strain with high oil content under light/dark conditions. Selective breeding of oil-rich Chlamydomonas mutant was performed by combining heavy ion beam mutagenesis and fluorescence-activated cell sorting (FACS). JSC4 cells seeded on agar plates were exposed to 50 Gy of the carbon ion beams (12C5+, 220 MeV) accelerated by an AVF cyclotron at TIARA, QST. Mutant cells were cultured under light/dark conditions, followed by FACS-based screening for oil-rich cells using BODIPY fluorescence and chlorophyll fluorescence as the indicators of oil and cell size, respectively. Consequently, an oil-rich mutant strain KOR1 was obtained.
Overcoming Decreased Lipid Accumulation Under Light/Dark Conditions by Selective Breeding of Oil-Rich Chlamydomonas Mutants
