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Applied and Environmental Microbiology, January 1999, p. 169-174, Vol. 65, No. 1
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

In Situ Population Dynamics of Bacterial Viruses in a Terrestrial Environment

Kevin E. Ashelford,1,* Martin J. Day,1 Mark J. Bailey,2 Andrew K. Lilley,2 and John C. Fry1

Cardiff School of Biosciences, Cardiff University, Cardiff CF1 3TL,1 and N.E.R.C. Institute of Virology and Environmental Microbiology, Oxford OX1 3SR,2 United Kingdom

Received 23 June 1998/Accepted 11 October 1998

Predation by bacteriophages is thought to control bacterial numbers and facilitate gene transfer among bacteria in the biosphere. A thorough understanding of phage population dynamics is therefore necessary if their significance in natural environments is to be fully appreciated. Here we describe the in situ population dynamics of three separate phage populations predating on separate bacterial species, living on the surface of field-grown sugar beet (Beta vulgaris var. Amethyst), as recorded over a 9-month period. The distributions of the three phage populations were different and fluctuated temporally in 1996 (peak density, ~103 PFU g-1). One of these populations, predating on the indigenous phytosphere bacterium Serratia liquefaciens CP6, consisted of six genetically distinct DNA phages that varied in relative abundance to the extent that an apparent temporal succession was observed between the two most abundant phages, Phi CP6-1 and Phi CP6-4.

* Corresponding author. Mailing address: Cardiff School of Biosciences, Cardiff University, P.O. Box 915, Cardiff CF1 3TL, United Kingdom. Phone: 44 (0)1222 874000. Fax: 44 (0)1222 874305. E-mail: Ashelford{at}cardiff.ac.uk.

Applied and Environmental Microbiology, January 1999, p. 169-174, Vol. 65, No. 1
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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