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The establishment of an introduced community of fluorescent pseudomonads in the soil and in the rhizosphere is affected by soil type

The establishment of an introduced community of fluorescent pseudomonads in the soil and in the rhizosphere is affected by soil type

FEMS microbiology ecology 30(2): 163-170

Indigenous populations of fluorescent pseudomonads were previously shown to vary in two different soils (Chateaurenard and Dijon) and in the rhizosphere of a plant species (Linum usitatissimum L.) cultivated in these two soils. These differences could be related to the soil type and to their crop history. In the present study the influence of the soil type on the diversity of fluorescent pseudomonads in bulk and rhizospheric soils was evaluated. The soils of Chateaurenard and Dijon were sterilized before being inoculated with the same community of fluorescent pseudomonads. Bacterial isolates from bulk and rhizospheric soils were characterized on the basis of their repetitive extragenic palindromic-PCR patterns allowing the comparison of the distributions of the introduced populations. The influence of the soil type on the establishment of the introduced bacterial community was recorded in the two bulk soils. Indeed, the density and the structure of the community differed significantly between the two soils. The rhizosphere effect was also affected by the soil type. This effect was expressed in the Chateaurenard soil but not in the Dijon soil. Hence, the structure of the bacterial community associated with the roots of the same plant species cultivated in the two soils differed significantly.

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