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KMID : 0545120080180030539
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Journal of Microbiology and Biotechnology
2008 Volume.18 No. 3 p.539 ~ p.544
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Enhanced Biomass and γ-Linolenic Acid Production of Mutant Strain Arthrospira platensis
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Choi Gang-Guk
Park Myong-Suk
Ahn Chi-Yong
Oh Hee-Mock
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Abstract
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A mutant of Arthrospira platensis PCC 9108, strain M9108, obtained by mutagenesis with UV treatment, was able to mixotrophically grow in an SOT medium containing 40 g of glucose/l. The biomass and specific growth rate of strain M9108 (4.10 g/l and 0.70/d) were 1.9-fold and 1.4-fold higher, respectively, than those of the wild type (2.21 g/l and 0.58/d) under mixotrophic culture condition. In addition, when compared with the wild type, the content of γ- linolenic acid (GLA) in the mutant was increased when glucose concentration was increased. Compared with the wild type, the GLA content of the mutant was 2-fold higher in autotrophic culture and about 3-fold higher in mixotrophic culture. Thus, the mutant appears to possess more efficient facility to assimilate and metabolize glucose and to produce more GLA than its wild-type strain.
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KEYWORD
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Arthrospira platensis, biomass, γ-linolenic acid, GLA, mixotrophic cultivation, UV
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