Enhancing microalgal biomass productivity by engineering a microalgal–bacterial community

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 microorgan...

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Published in:Bioresource technology Vol. 175; pp. 578 - 585
Main Authors: Cho, Dae-Hyun, Ramanan, Rishiram, Heo, Jina, Lee, Jimin, Kim, Byung-Hyuk, Oh, Hee-Mock, Kim, Hee-Sik
Format: Journal Article
Language:English
Published: England 01.01.2015
Subjects:
Bacteria
Bacteria - genetics
Bacteria - metabolism
Biomass
biomass production
Biotechnology
Biotechnology - methods
Carbon
Carbon - metabolism
carbon cycle
Chlorella vulgaris
Chlorella vulgaris - growth & development
Chlorella vulgaris - metabolism
Chlorella vulgaris - microbiology
coculture
Consortia
engineering
Exchange
Flocculation
lipid content
Lipid Metabolism
Lipids
Lipids - chemistry
metabolism
microalgae
Microalgae - growth & development
Microalgae - metabolism
Microalgae - microbiology
Microbial Consortia - genetics
Microbial Consortia - physiology
molecular weight
Productivity
Symbiosis
Artificial microalgal bacterial community
Phycosphere bacteria
Biodiesel
Growth enhancement
Chlorella vulgaris
ISSN:0960-8524, 1873-2976, 1873-2976
Online Access:Get full text
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Summary: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.
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ISSN:0960-8524
1873-2976
1873-2976
DOI:10.1016/j.biortech.2014.10.159