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- W2163913515 abstract "Plasmid transfer rates for the conjugative plasmid R388::Tn1721 from Pseudomonas cepacia (donor) to Pseudomonas fluorescens (recipient) on agar media, in broth, and in microcosms containing sterile or nonsterile soil, in the presence or absence of germinating pea seeds, were determined. Donors, recipients, and transconjugants were enumerated on selective media after 1 day on agar or in broth culture and over a 7-day period in soil or pea spermosphere microcosms. Donor and recipient growth rates and plasmid transfer rate constants [(gamma), where (gamma) = transconjugants (middot) (donors (middot) recipients)(sup-1) (middot) h(sup-1)] were calculated for three initial parental densities (10(sup4), 10(sup6), or 10(sup8) CFU/g or ml) in each system. For all initial density levels, values of (gamma) in agar and broth matings were higher than those in soil or in the pea spermosphere-rhizosphere microcosms. Values of (gamma) were not influenced by the pea spermosphere or by sterile or nonsterile conditions of the soil. However, (gamma) values in microcosm experiments were inversely related to initial parental density and were directly related to donor growth rates. Values of (gamma) averaged 4 x 10(sup-10), 4 x 10(sup-12), and 3 x 10(sup-14) when initial donor and recipient cell densities were 10(sup4), 10(sup6), and 10(sup8) CFU/g, respectively. These results suggest that the plasmid transfer rate constant is independent of parental cell density only when parental growth is not limited. In a resource-limited environment, intra- or interspecific competition may reduce the transfer rate by limiting parental growth." @default.
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- W2163913515 date "1995-08-01" @default.
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- W2163913515 title "Effect of parental growth on dynamics of conjugative plasmid transfer in the pea spermosphere" @default.
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- W2163913515 doi "https://doi.org/10.1128/aem.61.8.3136-3141.1995" @default.
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