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Applied and Environmental Microbiology, March 2000, p. 930-936, Vol. 66, No. 3
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Succession of Microbial Communities during Hot
Composting as Detected by PCR-Single-Strand-Conformation
Polymorphism-Based Genetic Profiles of Small-Subunit rRNA
Genes
Sabine
Peters,
Stefanie
Koschinsky,
Frank
Schwieger, and
Christoph C.
Tebbe*
Institut für Agrarökologie,
Bundesforschungsanstalt für Landwirtschaft, 38116 Braunschweig,
Germany
Received 30 September 1999/Accepted 14 December 1999
A cultivation-independent technique for genetic profiling of
PCR-amplified small-subunit rRNA genes (SSU rDNA) was chosen to
characterize the diversity and succession of microbial communities during composting of an organic agricultural substrate. PCR
amplifications were performed with DNA directly extracted from compost
samples and with primers targeting either (i) the V4-V5 region of
eubacterial 16S rRNA genes, (ii) the V3 region in the 16S rRNA genes of
actinomycetes, or (iii) the V8-V9 region of fungal 18S rRNA genes.
Homologous PCR products were converted to single-stranded DNA molecules
by exonuclease digestion and were subsequently electrophoretically separated by their single-strand-conformation polymorphism (SSCP). Genetic profiles obtained by this technique showed a succession and
increasing diversity of microbial populations with all primers. A total
of 19 single products were isolated from the profiles by PCR
reamplification and cloning. DNA sequencing of these molecular isolates
showed similarities in the range of 92.3 to 100% to known gram-positive bacteria with a low or high G+C DNA content and to the
SSU rDNA of
-Proteobacteria. The amplified 18S rRNA gene sequences were related to the respective gene regions of Candida krusei and Candida tropicalis. Specific molecular
isolates could be attributed to different composting stages. The
diversity of cultivated bacteria isolated from samples taken at the end
of the composting process was low. A total of 290 isolates were related to only 6 different species. Two or three of these species were also
detectable in the SSCP community profiles. Our study indicates that
community SSCP profiles can be highly useful for the monitoring of
bacterial diversity and community successions in a biotechnologically relevant process.
*
Corresponding author. Mailing address: Institut
für Agrarökologie, Bundesforschungsanstalt für
Landwirtschaft (FAL), Bundesallee 50, 38116 Braunschweig, Germany.
Phone: 49 531-596 736. Fax: 49 531-596 366. E-mail:
christoph.tebbe{at}fal.de.
Applied and Environmental Microbiology, March 2000, p. 930-936, Vol. 66, No. 3
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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