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Appl. Environ. Microbiol., May 1997, 1980-1986, Vol 63, No. 5
A Gotz and K Smalla
We report a field study on plasmid mobilization in an agricultural soil.
The influence of pig manure on the mobilization of the IncQ plasmid pIE723
by indigenous plasmids or by the IncP(alpha) plasmid pGP527 into the
recipient Pseudomonas putida UWC1 (Rif(supr) Nal(supr)) was studied in
field soil. Six plots were prepared in duplicate, three of which were
treated with manure prior to inoculation of the donor and recipient
strains. As a donor strain, either Escherichia coli J53(pIE723) or E. coli
600(pIE723, pGP527) was used. Putative transconjugants obtained on a
selective medium were confirmed by DNA hybridization and PCR. Plasmid
mobilization by indigenous mobilizing plasmids was observed on two
occasions in manured soil. Manuring of soil significantly enhanced the
frequency of pIE723 mobilization by pGP527, since mobilization frequencies
into P. putida UWC1 were at least 10-fold higher in manured soil than in
nonmanured soil. Enhanced numbers of P. putida UWC1 transconjugant and
recipient colonies could be observed in manured soil throughout the 79-day
field test. Transfer of pIE723 or pG527 into indigenous soil or rhizosphere
bacteria could not be detected when indigenous bacteria isolated by
selective cultivation were screened for the presence of these plasmids by
DNA hybridization. Furthermore, the presence of IncN-, IncP-, or
IncQ-specific sequences was confirmed in total community DNA extracted
directly from the manured or nonmanured soil by PCR. IncW plasmids were
detectable only in manured soil, indicating entry of these plasmids into
soil via manure.
Copyright © 1997, American Society for Microbiology
Manure Enhances Plasmid Mobilization and Survival of Pseudomonas putida Introduced into Field Soil
Biologische Bundesanstalt fur Land- und Forstwirtschaft, D-38104 Braunschweig, Germany
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