Effect of Bacteria in Algal Environment Regulated by Glucose Content on Ochromonas

Construction of microalgae and bacteria symbiotic system is an effective strategy to increase microalgae biomass as raw materials for bioenergy. In this study, the effect of symbiotic bacteria isolated from Ochromonas culture on microalgae growth in BG11 medium with and without glucose was analyzed....

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Bibliographic Details
Published in:Bioenergy research 2022-12, Vol.15 (4), p.2102-2110
Main Authors: Zhang, Bo, Liu, Keyi, Su, Yanru, Zhang, Anlong, Ji, Zhaojun
Format: Article
Language:English
Subjects:
Algae
Aquatic microorganisms
Bacillus
Bacteria
Biomass
Biomass energy
Biomedical and Life Sciences
Cell culture
Dextrose
Glucose
Growth rate
Life Sciences
Lysis
Metabolites
Microalgae
Ochromonas
Plant Breeding/Biotechnology
Plant Ecology
Plant Genetics and Genomics
Plant Sciences
Raw materials
Wood Science & Technology
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Summary:Construction of microalgae and bacteria symbiotic system is an effective strategy to increase microalgae biomass as raw materials for bioenergy. In this study, the effect of symbiotic bacteria isolated from Ochromonas culture on microalgae growth in BG11 medium with and without glucose was analyzed. The results demonstrated that nine bacterial genera were isolated: Rhizobium , Brevundimonas , Porphyrobacter , and Aquimonas (belonging to Proteobacteria); Algoriphagu s (belonging to Bacteroidetes); Aneurinibacillus , Bacillus cerus , Bacillus , and Bacillus licheniformis (belonging to Firmicutes). Five of the nine bacteria could enhance the growth of Ochromonas in the nutritional environment of BG11. Conversely, the microalgae promoting effect of bacteria gradually decreased or disappeared with the increase of bacterial metabolites addition in BG11 medium containing glucose. Among which, Porphyrobacter and Aneurinibacillus could respectively increase the Ochromonas biomass by 1.4 and 1.1 times in BG11 mainly though metabolites secretion. Meanwhile, in the environment with more than 5 g·L −1 of glucose, Aneurinibacillus culture reduced the specific growth rate of microalgae by 74%, and 10 g·L −1 of glucose would cause the lysis of Ochromonas cells directly. Thus the effect of symbiotic bacteria on biomass accumulation of microalgae is regulated by glucose concentration in system.
ISSN:1939-1234
1939-1242
DOI:10.1007/s12155-022-10400-w