Algal growth enhancement by bacteria: Is consumption of photosynthetic oxygen involved?

Pseudomonas diminuta and P. vesicularis, two obligate aerobes isolated from laboratory algal cultures, stimulated the growth of the green microalgae Scenedesmus bicellularis and Chlorella sp., without releasing any growth promoting substance. An intimate contact between both microorganisms was neces...

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Bibliographic Details
Published in:FEMS microbiology ecology 1995, Vol.18 (1), p.35-43
Main Authors: Mouget, Jean-Luc, Dakhama, Azzeddine, Lavoie, Marc C., de la Noüe, Joël
Format: Article
Language:English
Subjects:
Algal growth enhancement
Algal-bacterial interaction
Animal, plant and microbial ecology
Bacterial O 2-consumption
Biological and medical sciences
Brevundimonas diminuta
Brevundimonas vesicularis
carbon dioxide
Chlorella
Dissolved inorganic carbon pump
Freshwater
Fundamental and applied biological sciences. Psychology
growth
interactions
Microbial ecology
Microflora of plants
oxygen
photosynthesis
Pseudomonas
Pseudomonas diminuta
Pseudomonas vesicularis
Scenedesmus
Scenedesmus bicellularis
stimulation
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Summary:Pseudomonas diminuta and P. vesicularis, two obligate aerobes isolated from laboratory algal cultures, stimulated the growth of the green microalgae Scenedesmus bicellularis and Chlorella sp., without releasing any growth promoting substance. An intimate contact between both microorganisms was necessary for significant algal growth enhancement. The possibility of algal growth stimulation by bacterial attenuation of photosynthetic oxygen tension was indirectly examined by simulating the effect of bacteria through a physical removal of oxygen (air suction). Vacuum-treated cultures showed an increase in growth rate and photosynthetic activity as compared to the control, a result which cannot be explained by differences in CO 2/HCO 3 − pump activity. In the presence of P. diminuta, the photosynthetic activity of S. bicellularis was more strongly stimulated under a limited concentration of inorganic carbon. It is suggested that, apart from a CO 2 supply, aerobic bacteria can promote algal growth by reducing the photosynthetic oxygen tension within the microenvironment of the algal cells, thereby creating more favorable conditions for optimal photosynthetic algal growth.
ISSN:0168-6496
1574-6941
DOI:10.1016/0168-6496(95)00038-C