Enhancing microalgal biomass productivity by engineering a microalgal-bacterial community

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Title
Enhancing microalgal biomass productivity by engineering a microalgal-bacterial community
Author(s)
Dae Hyun Cho; R Ramanan; Jina Heo; Jimin Lee; Byung-Hyuk Kim; Hee-Mock OhHee-Sik Kim
Bibliographic Citation
Bioresource Technology, vol. 175C, pp. 578-585
Publication Year
2015
Abstract
This study demonstrates that ecologically engineered bacterial consortium could enhance microalgal biomass and lipid productivities through carbon exchange. Phycosphere bacterial diversity analysis in xenic Chlorella vulgaris (XCV) confirmed the presence of growth enhancing and inhibiting microorganisms. Co-cultivation of axenic C. vulgaris (ACV) with four different growth enhancing bacteria revealed a symbiotic relationship with each bacterium. An artificial microalgal-bacterial consortium (AMBC) constituting these four bacteria and ACV showed that the bacterial consortium exerted a statistically significant (P<. 0.05) growth enhancement on ACV. Moreover, AMBC had superior flocculation efficiency, lipid content and quality. Studies on carbon exchange revealed that bacteria in AMBC might utilize fixed organic carbon released by microalgae, and in return, supply inorganic and low molecular weight (LMW) organic carbon influencing algal growth and metabolism. Such exchanges, although species specific, have enormous significance in carbon cycle and can be exploitated by microalgal biotechnology industry.
Keyword
Artificial microalgal bacterial communityBiodieselChlorella vulgarisGrowth enhancementPhycosphere bacteria
ISSN
0960-8524
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.biortech.2014.10.159
Type
Article
Appears in Collections:
Division of Biomaterials Research > Cell Factory Research Center > 1. Journal Articles
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