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The Korean Society of Phycology (한국조류학회(藻類))
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Omega-7 producing alkaliphilic diatom Fistulifera sp. (Bacillariophyceae) from Lake Okeechobee, Florida

  • Berthold, David Erwin (Department of Earth and Environment, Florida International University) ;
  • Rosa, Nina de la (Department of Earth and Environment, Florida International University) ;
  • Engene, Niclas (Department of Biological Sciences, Florida International University) ;
  • Jayachandran, Krish (Department of Earth and Environment, Florida International University) ;
  • Gantar, Miroslav (Department of Biological Sciences, Florida International University) ;
  • Laughinghouse, Haywood Dail IV (Fort Lauderdale Research and Education Center, University of Florida/IFAS) ;
  • Shetty, Kateel G. (Department of Earth and Environment, Florida International University)
  • Received : 2019.07.19
  • Accepted : 2019.12.16
  • Published : 2020.03.15
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Abstract

Incorporating renewable fuel into practice, especially from algae, is a promising approach in reducing fossil fuel dependency. Algae are an exceptional feedstock since they produce abundant biomass and oils in short timeframes. Algae also produce high-valued lipid products suitable for human nutrition and supplement. Achieving goals of producing algae fuels and high-valued lipids at competitive prices involves further improvement of technology, especially better control over cultivation. Manipulating microalgae cultivation conditions to prevent contamination is essential in addition to promoting optimal growth and lipid yields. Contamination of algal cultures is a major impediment to algae cultivation that can however be mitigated by choosing extremophile microalgae. This work describes the isolation of alkali-tolerant / alkaliphilic microalgae native to South Florida with ideal characteristics for cultivation. For that purpose, water samples from Lake Okeechobee were inoculated into Zarrouk's medium (pH 9-12) and incubated for 35 days. Selection resulted in isolation of three strains that were screened for biomass and lipid accumulation. Two alkali-tolerant algae Chloroidium sp. 154-1 and Chlorella sp. 154-2 were poor lipid accumulators. One of the isolates, the diatom Fistulifera sp. 154-3, was identified as a lipid accumulating, alkaliphilic organism capable of producing 0.233 g L-1 d-1 dry biomass and a lipid content of 20-30% dry weight. Lipid analysis indicated the most abundant fatty acid within Fistulifera sp. was palmitoleic acid (52%), or omega-7, followed by palmitic acid (17%), and then eicosapentanoic acid (15%). 18S rRNA phylogenetic analysis formed a well-supported clade with Fistulifera species.

Keywords

References

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