Summary
The effectiveness of gene probe methods for tracking genetically engineered microorganisms (GEMs) in the environment was tested by inoculating nutrient-supplemented freshwater microcosms withAlcaligenes A5 (a naturally occurring 4-chlorobiphenyl degrader) orPseudomonas cepacia AC1100 (a genetically engineered 2, 4, 5 T-degrader) and following the fates of the introduced bacterial populations. Colony hybridization of the viable heterotrophic bacterial populations and dot blot hybridization of DNA recovered from the total microcosm microbial communities showed persistence of bothAlcaligenes A5 andP. cepacia AC1100 in the microcosms in the presence and absence of the xenobiotic substrates that these organisms biodegrade. Although there was a gradual decline in the added populations, both of the bacterial populatins were still detected in the microcosms two months after their introduction into the microcosms. Addition of 2, 4, 5-T enhanced the survival ofP. cepacia AC1100 — and 4-chlorobiphenyl addition resulted in increased levels ofAlcaligenes A5. The results indicate that both organisms may persist for very long periods in freshwater habitats.
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Steffan, R.J., Breen, A., Atlas, R.M. et al. Monitoring genetically engineered microorganisms in freshwater microcosms. Journal of Industrial Microbiology 4, 441–446 (1989). https://doi.org/10.1007/BF01569640
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DOI: https://doi.org/10.1007/BF01569640