Community dynamics of methanotrophic bacteria during composting of organic matter

Halet, Dirk, Boon, Nico and Verstraete, Willy (2006) Community dynamics of methanotrophic bacteria during composting of organic matter. Journal of Bioscience and Bioengineering, 101 4: 297-302. doi:10.1263/jbb.101.297

Author Halet, Dirk
Boon, Nico
Verstraete, Willy
Title Community dynamics of methanotrophic bacteria during composting of organic matter
Journal name Journal of Bioscience and Bioengineering   Check publisher's open access policy
ISSN 1389-1723
Publication date 2006-04
Sub-type Article (original research)
DOI 10.1263/jbb.101.297
Volume 101
Issue 4
Start page 297
End page 302
Total pages 6
Place of publication Osaka, Japan
Publisher Society for Biotechnology, Japan
Language eng
Subject 0605 Microbiology
Formatted abstract
In this study, we describe the effects of composting on the diversity, abundance and activity of the methanotrophic community present in the compost. Composting was allowed to proceed for 10 weeks in an in-vessel reactor. Self-heating capacity (Rottegrad) indicated that compost maturity was reached after 4 weeks. After 6 weeks, a second thermophilic phase was induced by manually increasing temperature to investigate whether or not the methanotrophs shifted back to the thermophilic population. Polymerase chain reaction (PCR)-denaturing gradient gel electrophoresis (DGGE) with primers specific for type I methanotrophs of 16S rDNA and 16S rRNA were used to characterize the composition of the microbial community. Cluster and diversity analyses of RNA DGGE patterns were more sensitive than those of DNA DGGE patterns, and revealed that mesophilic and thermophilic methanotrophic communities could be differentiated. Moreover, it was seen that the diversity of the community was low during the thermophilic phase and increased during the final maturation phase. Real-time PCR analysis was also performed on the DNA and RNA extracts and showed no changes in the abundance of type I methanotrophs during the composting process (109 DNA copies/g compost). However, RNA-related activity did change, with the lowest activity (107 cDNA copies/g compost) observed during the thermophilic phase, subsequently increasing to its maximum value (109 cDNA copies/g compost), and finally decreasing during the maturation phase. This study confirmed the population dynamics, as seen for general groups such as bacteria and fungi during composting, for a very specific and sensitive group of bacteria, it is the type I methanotrophs.
Keyword Compost
16S rRNA
Methanotrophic community
Polymerase chain reaction-denaturing gradient gel
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
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Created: Mon, 16 Feb 2009, 15:21:54 EST by Joanne Mellor on behalf of Advanced Water Management Centre