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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3963

Title: Competitive exclusion as a mode of action of a novel Bacillus cereus aquaculture biological agent
Authors: Lalloo, R
Moonsamy, G
Ramchuran, S
Görgens, J
Gardiner, N
Keywords: Bacillus spp
Biological agent
Issue Date: 2010
Publisher: Society for Applied Microbiology
Citation: Lalloo, R, Moonsamy, G et al. 2010. Competitive exclusion as a mode of action of a novel Bacillus cereus aquaculture biological agent. Letters in Applied Microbiology, Vol.(2010), pp 1-26
Abstract: When B. cereus was tested in plate well inhibition studies, no production of antimicrobial compounds was detected. B. cereus had a high growth rate (0.96.h−1), whereas Aer. hydrophila concentration decreased by ∼70% in co-culture experiments. In nutrient limitation studies, B. cereus had a significantly higher growth rate when cultured under glucose (p<0.05) and iron (p<0.01) limitation in comparison to Aer. hydrophila. B. cereus glucose (0.30 g.l−1.h−1) and iron (0.60 mg.l−1.h−1) uptake rates were also significantly higher (p<0.01) than the Aer. hydrophila glucose (0.14 g.l−1.h−1) and iron (0.43 mg.l−1.h−1) uptake rates. Iron uptake was facilitated by siderophore production shown in time profile studies where relative siderophore production was ∼60% through the late exponential and sporulation phases.Competitive exclusion by higher growth rate, competition for organic carbon and iron, facilitated by siderophore production, could be identified as mechanisms of pathogen growth inhibition by B. cereus. This study is the first elucidation of the mechanism of action of our novel B. cereus biological agent in growth attenuation of pathogenic Aer. hydrophila. This study enhances the application knowledge and attractiveness for adoption of B. cereus NRRL 100132 for exploitation in aquaculture.
Description: Copyright: 2009 Wiley-Blackwell. This is the author's version of the work. It is posted here by permission of Wiley-Blackwell for your personal use. Not for redistribution. The definitive version was published in the Letters in Applied Microbiology, Vol. (2010)
URI: http://www3.interscience.wiley.com/journal/123304829/abstract
ISSN: 0266-8254
Appears in Collections:Ecosystems processes & dynamics
General science, engineering & technology

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