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. 1997 Apr;63(4):1584–1587. doi: 10.1128/aem.63.4.1584-1587.1997

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

A K Lilley, M J Bailey
PMCID: PMC1389559  PMID: 16535581

Abstract

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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Selected References

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