Abstract
A greater understanding of the tightly linked trophic groups of anaerobic and aerobic bacteria residing in municipal solid waste landfills will increase our ability to control methane emissions and pollutant fate in these environments. To this end, we characterized the composition of methanogenic and methanotrophic bacteria in samples taken from two regions of a municipal solid waste landfill that varied in age. A method combining polymerase chain reaction amplification, restriction fragment length polymorphism analysis and phylogenetic analysis was used for this purpose. 16S rDNA sequence analysis revealed a rich assemblage of methanogens in both samples, including acetoclasts, H2/CO2-users and formate-users in the newer samples and H2/CO2-users and formate-users in the older samples, with closely related genera including Methanoculleus, Methanofollis, Methanosaeta and Methanosarcina. Fewer phylotypes of type 1 methanotrophs were observed relative to type 2 methanotrophs. Most type 1 sequences clustered within a clade related to Methylobacter, whereas type 2 sequences were broadly distributed among clades associated with Methylocystis and Methylosinus species. This genetic characterization tool promises rapid screening of landfill samples for genotypes and, therefore, degradation potentials.
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- Altschul S. F., Gish W., Miller W., Myers E. W., Lipman D. J. Basic local alignment search tool. J Mol Biol. 1990 Oct 5;215(3):403–410. doi: 10.1016/S0022-2836(05)80360-2. [DOI] [PubMed] [Google Scholar]
- Burggraf S., Stetter K. O., Rouviere P., Woese C. R. Methanopyrus kandleri: an archaeal methanogen unrelated to all other known methanogens. Syst Appl Microbiol. 1991;14:346–351. doi: 10.1016/s0723-2020(11)80308-5. [DOI] [PubMed] [Google Scholar]
- Little C. D., Palumbo A. V., Herbes S. E., Lidstrom M. E., Tyndall R. L., Gilmer P. J. Trichloroethylene biodegradation by a methane-oxidizing bacterium. Appl Environ Microbiol. 1988 Apr;54(4):951–956. doi: 10.1128/aem.54.4.951-956.1988. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Thompson J. D., Gibson T. J., Plewniak F., Jeanmougin F., Higgins D. G. The CLUSTAL_X windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. Nucleic Acids Res. 1997 Dec 15;25(24):4876–4882. doi: 10.1093/nar/25.24.4876. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Whalen S. C., Reeburgh W. S., Sandbeck K. A. Rapid methane oxidation in a landfill cover soil. Appl Environ Microbiol. 1990 Nov;56(11):3405–3411. doi: 10.1128/aem.56.11.3405-3411.1990. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wilson J. T., Wilson B. H. Biotransformation of trichloroethylene in soil. Appl Environ Microbiol. 1985 Jan;49(1):242–243. doi: 10.1128/aem.49.1.242-243.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Wise M. G., McArthur J. V., Shimkets L. J. Methanotroph diversity in landfill soil: isolation of novel type I and type II methanotrophs whose presence was suggested by culture-independent 16S ribosomal DNA analysis. Appl Environ Microbiol. 1999 Nov;65(11):4887–4897. doi: 10.1128/aem.65.11.4887-4897.1999. [DOI] [PMC free article] [PubMed] [Google Scholar]