Large-scale screening of natural genetic resource in the hydrocarbon-producing microalga Botrycoccus braunii identified novel fast-growing strains

Kawamura K., Nishikawa S., Hirano K., Ardianor A., Nugroho R.A., Okada S.

Department of Environmental Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku, Osaka, 535-8585, Japan; University of Palangka Raya, Palangkaraya, Indonesia; Faculty of Mathematics and Natural Sciences, Mulawarman University, Samarinda, East Kalimantan, Indonesia; Research Center of Natural Products From Tropical Rainforest (PUI PT OKTAL), Mulawarman University, Samarinda, East Kalimantan, Indonesia; Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan


Abstract

Algal biofuel research aims to make a renewable, carbon–neutral biofuel by using oil-producing microalgae. The freshwater microalga Botryococcus braunii has received much attention due to its ability to accumulate large amounts of petroleum-like hydrocarbons but suffers from slow growth. We performed a large-scale screening of fast-growing strains with 180 strains isolated from 22 ponds located in a wide geographic range from the tropics to cool-temperate. A fast-growing strain, Showa, which recorded the highest productivities of algal hydrocarbons to date, was used as a benchmark. The initial screening was performed by monitoring optical densities in glass tubes and identified 9 wild strains with faster or equivalent growth rates to Showa. The biomass-based assessments showed that biomass and hydrocarbon productivities of these strains were 12–37% and 11–88% higher than that of Showa, respectively. One strain, OIT-678 established a new record of the fastest growth rate in the race B strains with a doubling time of 1.2 days. The OIT-678 had 36% higher biomass productivity, 34% higher hydrocarbon productivity, and 20% higher biomass density than Showa at the same cultivation conditions, suggesting the potential of the new strain to break the record for the highest productivities of hydrocarbons. © 2021, The Author(s).


Journal

Scientific Reports

Publisher: Nature Research

Volume 11, Issue 1, Art No 7368, Page – , Page Count


Journal Link: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103856882&doi=10.1038%2fs41598-021-86760-8&partnerID=40&md5=eb52164760f338976acd82676dc550cc

doi: 10.1038/s41598-021-86760-8

Issn: 20452322

Type: All Open Access, Gold, Green


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