Long-term and short-term inducible effects of trifluralin on Escherichia coli and Enterococcus faecalis

In order to investigate the effects of the herbicide trifluralin on the indicator bacteria Escherichia coli and Enterococcus faecalis, these bacteria were inoculated into four different concentrations of trifluralin (0.1, 1, 10 and 100 µg/L). The bacterial growth was monitored turbidimetrically, fol...

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Bibliographic Details
Published in:Microbial ecology in health and disease 2005, Vol.17 (2), p.121-127
Main Authors: Koutsotoli, Alexandra D., Dimou, Dimitra S., Bezirtzoglou, Eugenia EB, Alamanos, Yannis P., Maipa, Vassiliki E.
Format: Article
Language:English
Subjects:
Enterococcus avium
Enterococcus faecalis
Enterococcus faecium
Escherichia coli
Hafnia alvei
indicator bacteria
pollution
trifluralin
water
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Summary:In order to investigate the effects of the herbicide trifluralin on the indicator bacteria Escherichia coli and Enterococcus faecalis, these bacteria were inoculated into four different concentrations of trifluralin (0.1, 1, 10 and 100 µg/L). The bacterial growth was monitored turbidimetrically, followed by membrane filtration where membranes were placed on selective media agar. A non-typical morphology of colonies together with loss of culturability was recorded in all cases. Furthermore, differentiation in the strains' biochemical profiles was noted. E. coli was identified as Hafnia alvei and Ent. faecalis as Enterococcus faecium or Enterococcus avium. The current study suggests that the use of these two indicator bacteria in routine microbiological analysis of water might be questioned since trifluralin diluted to contaminated water has the potential to promote their growth and change their morphological and biochemical characteristics.
ISSN:0891-060X
1651-2235
1651-2235
DOI:10.1080/08910600510044859