The microalgae family Chlorella species are known to accumulate starch and lipids. Although nitrogen or phosphorous deficiencies promote starch and lipids formation in many microalgae, these deficiencies also limit their growth and productivity. Therefore, the Chlorellaceae strains were attempted to increase starch and lipids productivity under high-light-intensity conditions (600-μmol photons m(-2)s(-1)). The 12:12-h light-dark (LD) cycle conditions elicited more stable growth than the continuous light (LL) conditions, whereas the starch and lipids yields increased in LL conditions. The amount of starch and lipids per cell increased in Chlorella viscosa and Chlorella vulgaris in sulfur-deficient medium, and long-chain fatty acids with 20 or more carbon atoms accumulated in cells grown in sulfur-deficient medium. Accumulation of starch and lipids was investigated in eight strains. The accumulation was strain-dependent, and varied according to the medium and light conditions. Five of the eight Chlorella strains exhibited similar accumulation patterns.

Bioimaging Center Graduate School of Frontier Science University of Tokyo 5 1 5 Kashiwanoha Kashiwa Chiba 277 8562 Japan

Department of Integrated Biosciences Graduate School of Frontier Sciences University of Tokyo 5 1 5 Kashiwanoha Kashiwa Chiba 277 8562 Japan

Department of Integrated Biosciences Graduate School of Frontier Sciences University of Tokyo 5 1 5 Kashiwanoha Kashiwa Chiba 277 8562 Japan; Japan Science and Technology Agency CREST 5 1 5 Kashiwanoha Kashiwa Chiba 277 8562 Japan

Laboratory of the Cell Cycles of Algae Institute of Microbiology Academy of Sciences of the Czech Republic Opatovický mlýn Třeboň 379 81 Czech Republic

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