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Applied and Environmental Microbiology
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General Microbial Ecology

Genetic Variation within a Lotic Population of Janthinobacterium lividum

Jennifer L. Saeger, Alan B. Hale
Jennifer L. Saeger
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Alan B. Hale
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ABSTRACT

An understanding of the genetic variation within and between populations should allow scientists to address many problems, including those associated with endangered species and the release of genetically modified organisms into the environment. With respect to microorganisms, the release of genetically engineered microorganisms is likely to increase dramatically given the current growth in the bioremediation industry. In this study, genetic variation within a lotic, bacterial population of Janthinobacterium lividum was measured with restriction fragment length polymorphism analysis. Chromosomal DNA from 10 Kettle Creek (Hawk Mountain Sanctuary, Kempton, Pa.) J. lividum isolates was digested with six restriction endonucleases and probed with a 7.5-kb pKK3535 fragment containing the E. coli rrnB rRNA operon. Genetic variation, as measured in terms of nucleotide diversity, was high within the population. The 0.0781 value for genetic variation was especially high given the conservative nature of the genetic probe. The average percent similarity among isolates within the population was 67.25%. Pairwise comparisons of nucleotide diversity values (π) and similarity coefficients (F) yielded values ranging from 0.0032 to 0.1816 and 0.3363 to 0.9808, respectively. Putative clonemates were not present within the group of isolates; however, all isolates shared 14 fragments across a spectrum of six restriction enzymes. The presence of these common fragments indicates that restriction fragment length polymorphism analysis may provide population- or species-specific diagnostic markers for J. lividum. Data that suggest a plume effect with respect to the downstream movement of J. lividum are also presented. An increase in genetic variation within groups of isolates along the longitudinal gradient of Kettle Creek is also suggested.

FOOTNOTES

  • ↵* Corresponding author.

  • ↵† Present address: Department of Molecular Biology, Princeton University, Princeton, NJ 08544.

  • Copyright © 1993, American Society for Microbiology
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Genetic Variation within a Lotic Population of Janthinobacterium lividum
Jennifer L. Saeger, Alan B. Hale
Applied and Environmental Microbiology Jul 1993, 59 (7) 2214-2219; DOI:

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Genetic Variation within a Lotic Population of Janthinobacterium lividum
Jennifer L. Saeger, Alan B. Hale
Applied and Environmental Microbiology Jul 1993, 59 (7) 2214-2219; DOI:
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