Effect of soil type and plant species on the fluorescent pseudomonads nitrate dissimilating community |
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Authors: | Clays-Josserand A Ghiglione JF Philippot L Lemanceau P Lensi R |
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Institution: | (1) Laboratoire d'Ecologie Microbienne, Centre National de la Recherche Scientifique UMR 5557, Université Lyon I, 69622 Villeurbanne Cédex, France;(2) Laboratoire de Microbiologie des Sols, Institut National de la Recherche Agronomique, 21034 Dijon Cédex, France;(3) Laboratoire de Recherches sur la Flore Pathogène du Sol, Institut National de la Recherche Agronomique, 21034 Dijon Cédex, France |
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Abstract: | The distribution of nitrogen dissimilative abilities among 618 isolates of fluorescent pseudomonads was studied. These strains
were isolated from two uncultivated soils (C and D; collected at Chateaurenard and Dijon, France, respectively) and from rhizosphere,
rhizoplane and root tissue of two plant species (flax and tomato) cultivated on these two soils. According to their ability
to dissimilate nitrogen, the isolates have been distributed into three metabolic types: non-dissimilators, NO2
- accumulators and denitrifiers. While the three metabolic types were recovered in all the compartments of soil D experiments,
only two (non-dissimilators and denitrifiers) were recovered in all the compartments of soil C experiments. Even under the
contrasting conditions of the two soil types, both plants were able to select the nitrate dissimilating community among the
total community of fluorescent Pseudomonas, but the mode of this selection seems to be dependent on both plant and soil type.
The soil type appears to be unable to significantly modulate the strong selective effect of tomato. Indeed, similar dissimilator
to non-dissimilator ratios were found in the root tissue of this plant species cultivated in both soils. In contrast, the
different dissimilator to non-dissimilator ratios observed in flax roots between soils C and D suggest that the selective
effect of flax was modulated by the soil type. Taxonomic identifications showed that the 618 isolates were distributed among
three species (P. chlororaphis, P. fluorescens, P. putida) plus an intermediate type between P. fluorescens and P. putida.
However, no clear relationship between the distribution of the metabolic types (functional diversity) and the distribution
of bacterial species has been found.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | flax nitrate dissimilation Pseudomonas rhizosphere soil tomato |
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