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Appl. Environ. Microbiol., Dec 1996, 4374-4380, Vol 62, No. 12
MG Weinbauer and CA Suttle
The potential effect that induction of lysogenic bacteria has on
bacteriophage production and bacterial mortality in coastal waters was
investigated, and we present estimates for the percentage of lysogenic
cells in a natural aquatic bacterial community. Various concentrations of
mitomycin C and exposure times to UV C radiation (UV-C) (wavelength of 254
nm) were used to induce the lytic cycle in lysogenic cells of natural
communities of marine bacteria. UV-C treatment occasionally resulted in
phage production, but phage production induced by UV-C was always less than
that caused by the addition of mitomycin C. There was no evidence that high
growth rates of bacteria resulted in lysogenic phage production. The burst
size of cells induced by mitomycin C was determined by transmission
electron microscopy and ranged from 11 to 45. Dividing the induced phage
production by the burst size provided an estimate of the number of
lysogenic bacterial cells, which ranged from 0.07 to 4.4% (average, 1.5%)
of the total bacterial population. The percentages of lysogenic bacteria
that were induced by mitomycin C were similar for samples collected
nearshore from the pier of the Marine Science Institute (chlorophyll a, 1.6
to 2.9 (mu)g liter(sup-1)) and in relatively oligotrophic water
(chlorophyll a, 0.2 to 0.9 (mu)g liter(sup-1)) collected 25 to 100 km
offshore. By using a steady-state model, if all lysogenic bacteria were
induced simultaneously, 0.14 to 8.8% (average, 3.0%) of the total bacterial
mortality would result from induction of lysogenic cells. If mitomycin C
induces all or the majority of lysogenized cells, our results imply that
lysogenic phage production is generally not an important source of phage
production or bacterial mortality in the coastal waters of the western Gulf
of Mexico.
Copyright © 1996, American Society for Microbiology
Potential Significance of Lysogeny to Bacteriophage Production and Bacterial Mortality in Coastal Waters of the Gulf of Mexico
Marine Science Institute, The University of Texas at Austin, Port Aransas, Texas 78373
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