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The Journal of Medical Microbiology, Vol 46, Issue 10 833-838, Copyright © 1997 by Society for General Microbiology

JOURNAL ARTICLE

Influence of iron, growth temperature and plasmids on siderophore production in Aeromonas hydrophila

A. J. Naidu and M. Yadav
Department of Genetics and Cellular Biology, University of Malaya, Kuala Lumpur, Malaysia.

Aeromonas hydrophila strains obtained from diarrhoeal samples of human patients (19 isolates) and freshwater ponds (11 isolates) were analysed for siderophore production. Both clinical and environmental isolates showed significantly increased siderophore production under iron-limiting conditions both at 28 degrees C and at 37 degrees C. Clinical isolates consistently produced higher levels of siderophores than did the environmental isolates. The role of plasmids in moderating siderophore production was studied after curing with acridine orange. Treatment with acridine orange for 24 h removed the larger plasmids but the smaller plasmids (< 5 MDa), more common in the environmental isolates, were resistant to curing. As found in the untreated isolates, the cured clinical isolates produced higher mean levels of siderophores than the cured environmental isolates. Siderophore production in A. hydrophila was significantly influenced by iron-limiting cultural conditions and the source of isolates, but plasmid content and growth temperature at 28 degrees C or 37 degrees C had little effect on production. The basis for the greater production of siderophores in clinical isolates than in environmental isolates needs further study.


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J. A. Santos, C. J. González, A. Otero, and M.-L. García-López
Hemolytic Activity and Siderophore Production in Different Aeromonas Species Isolated from Fish
Appl. Envir. Microbiol., December 1, 1999; 65(12): 5612 - 5614.
[Abstract] [Full Text]


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