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Related Experiment Video

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Phage diversity in a methanogenic digester.

M-O Park¹, H Ikenaga, K Watanabe

¹Laboratory of Applied Microbiology, Marine Biotechnology Institute, Kamaishi, Iwate, 026-0001, Japan.

Microbial Ecology

|December 23, 2006

Summary

This study found significant phage production in anaerobic digesters treating brewery waste, with effluent phage numbers 10 times higher than influent. This highlights the role of phages in these engineered ecosystems.

Area of Science:

Environmental microbiology
Virology
Anaerobic digestion

Background:

Bacteriophages (phages) influence prokaryotic communities in various ecosystems.
Limited knowledge exists on phages in anaerobic environments like methanogenic digesters.

Purpose of the Study:

Investigate phage production in an anaerobic sludge blanket digester treating brewery waste.
Quantify and characterize phage-like particles (PLPs) in digester influent and effluent.

Main Methods:

Sequential filtration for PLP concentration and purification.
Transmission electron microscopy (TEM) for visualization.
Fluorescence assay and field inversion gel electrophoresis (FIGE) for characterization.

Main Results:

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Effluent PLP concentrations exceeded 1 x 10(9) L-1, significantly higher than influent levels.
Estimated PLP production rate of at least 5.2 x 10(7) PLPs day-1 L-1.
TEM and FIGE revealed diverse phages, including Siphoviridae, Myoviridae, and Cystoviridae families.

Conclusions:

Anaerobic methanogenic digesters are significant sources of phage production.
A variety of phage types are active within these engineered ecosystems.
Phages likely play a crucial role in structuring prokaryotic communities in anaerobic digesters.