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Appl. Environ. Microbiol., Apr 1997, 1584-1587, Vol 63, No. 4
Copyright © 1997, American Society for Microbiology

Impact of Plasmid pQBR103 Acquisition and Carriage on the Phytosphere Fitness of Pseudomonas fluorescens SBW25: Burden and Benefit

AK Lilley and MJ Bailey
Molecular Microbial Ecology Laboratory, Institute of Virology and Environmental Microbiology, Natural Environment Research Council, Oxford OX1 3SR, United Kingdom

The phytosphere population densities of Pseudomonas fluorescens SBW25EeZY6KX (lacZX aph xylE) carrying pQBR103 (Hg(supr) Tra(sup+), 330 kbp) declined significantly relative to plasmid-free populations after seed inoculation. As the sugar beet plants matured, ca. 100 days after planting, simultaneous selections for plasmid-carrying hosts were observed in the phyllospheres and rhizospheres of field-grown plants. The recovery of these populations to densities indistinguishable from the densities of plasmid-free inocula (4 x 10(sup5) CFU/g in the rhizosphere) demonstrates that phytosphere-associated plasmids confer a specific fitness advantage to host bacteria.


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