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Applied and Environmental Microbiology, May 1999, p. 1959-1965, Vol. 65, No. 5
School of Pure and Applied Biology,
Received 27 October 1998/Accepted 11 February 1999
Six phages (
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Characterization of Six Bacteriophages of
Serratia liquefaciens CP6 Isolated from the Sugar Beet
Phytosphere
CP6-1 to
CP6-6) that are commonly found in the
phytosphere of sugar beet (Beta vulgaris var. Amethyst)
were investigated, and their relative impacts on their host
(Serratia liquefaciens CP6) were compared. There were
fundamental differences between the two most abundant predators of CP6
(
CP6-1 and
CP6-4). Like
CP6-2 and
CP6-5,
CP6-1 belonged
to the family Siphoviridae, while
CP6-4 exhibited the
morphology of the family Podoviridae. The other phages were
members of the family Myoviridae. DNA-DNA cross-hybridization revealed that
CP6-1 and
CP6-4 had little common DNA, although all of the other phages exhibited some genetic similarity. Like
CP6-2,
CP6-3, and
CP6-5,
CP6-1 was capable of forming a lysogenic association with its host, while
CP6-4 and
CP6-6 appeared to be entirely virulent. Single-step growth curve
experiments revealed that
CP6-4 had a much shorter latent period and
a smaller burst size than
CP6-1. Also,
CP6-1 could transduce a
number of host chromosomal markers with transfer frequencies of
2.9 × 10
9 to 3.9 × 10
7, whereas
CP6-4 could not transduce S. liquefaciens CP6 genes. When viewed in the context of the strikingly different temporal niches
of these phages, our data provide an insight into how bacteriophage interactions with their hosts might reflect the natural ecology of
bacteriophages. Our data also illustrate how the potential for gene
transfer changes over time in an environment that supports several
different phages.
*
Corresponding author. Mailing address: School of Pure
and Applied Biology, 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, May 1999, p. 1959-1965, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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