Influence of two plant species (flax and tomato) on the distribution of nitrogen dissimilative abilities within fluorescent Pseudomonas spp

The distribution of nitrogen-dissimilative abilities among 317 isolates of fluorescent pseudomonads was studied. These strains were isolated from an uncultivated soil and from the rhizosphere, rhizoplane, and root tissue of two plant species (flax and tomato) cultivated on this same soil. The isolat...

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Bibliographic Details
Published in:Applied and Environmental Microbiology 1995-05, Vol.61 (5), p.1745-1749
Main Authors: Clays-Josserand, A. (Universite Lyon I, Villeurbanne, France.), Lemanceau, P, Philippot, L, Lensi, R
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Bacteria
Biochemistry
Biochemistry and biology
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
DENITRIFICACION
DENITRIFICATION
Ecology, environment
Flowers & plants
Fundamental and applied biological sciences. Psychology
Life Sciences
LINUM USITATISSIMUM
LYCOPERSICON ESCULENTUM
Microbial ecology
Microbiology
Microflora of plants
MICROORGANISME
MICROORGANISMOS
NITRATE
NITRATOS
Nitrogen
OXIDO NITROSO
OXYDE NITREUX
Physics, chemistry, biochemistry and biology of agricultural and forest soils
PSEUDOMONAS FLUORESCENS
PSEUDOMONAS PUTIDA
RACINE
RAICES
REDUCCION
REDUCTION
RHIZOSPHERE
RIZOSFERA
Soil science
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Summary:The distribution of nitrogen-dissimilative abilities among 317 isolates of fluorescent pseudomonads was studied. These strains were isolated from an uncultivated soil and from the rhizosphere, rhizoplane, and root tissue of two plant species (flax and tomato) cultivated on this same soil. The isolates were distributed into two species, Pseudomonas fluorescens (45.1%) and Pseudomonas putida (40.4%), plus an intermediate type (14.5%). P. fluorescens was the species with the greatest proportion of isolates in the root compartments and the greatest proportion of dissimilatory and denitrifying strains. According to their ability to dissimilate nitrogen, the isolates have been distributed into nondissimilatory and dissimilatory strains, nitrate reducers and true denitrifiers with or without N2O reductase. The proportion of dissimilatory isolates was significantly enhanced in the compartments affected by flax and tomato roots (55% in uncultivated soil and 90 and 82% in the root tissue of flax and tomato, respectively). Among these strains, the proportion of denitrifiers gradually and significantly increased in the root vicinity of tomato (44, 68, 75, and 94% in uncultivated soil, rhizosphere, rhizoplane, and root tissue, respectively) and was higher in the flax rhizoplane (66%) than in the uncultivated soil. A higher proportion of N2O reducers was also found in the root compartments. This result was particularly clear for tomato. It is hypothesized that denitrification could be a selective advantage for the denitrifiers in the root environment and that this process could contribute to modify the specific composition of the bacterial communities in the rhizosphere
ISSN:0099-2240
1098-5336
DOI:10.1128/aem.61.5.1745-1749.1995