World Congress of Soil Science Logo 18th World Congress of Soil Science
July 9-15, 2006 - Philadelphia, Pennsylvania, USA
International Union of Soil Sciences

Monday, 10 July 2006 - Friday, 14 July 2006

This presentation is part of 141: 2.3B Molecular Approaches to Microbial Ecology in Soils - Poster

Effect of Plant and Soil on the Diversity of the Rhizospherical Fluorescent Pseudomonases spp. in Algeria.

Messaoud Benchabane, Univ de Blida, Faculté Agro – Vétérinaire, BP. 270, Blida, 09000, Algeria and Rabah Bakour, USTHB, BP 64, El Alia, Bab Ezzouar, 16000, Algeria.

Numerous taxonomical studies underlined the strong phenotypic and genetic heterogeneity at the fluorescent Pseudomonas spp. , notably those associated with plants rhizosphere. Although the subspecies classification (biovars and biotypes) reveals a strong phenotypic heterogeneity that can reflect a genome heterogeneity, it stays however as the most utilized system in the classification of this bacterial group. Different ecological and biologic factors can be an origin of the diversity and the adaptation of these rhizobacteria. Many studies achieved on this bacterial group revealed a strong specific diversity and subspecies. The distribution of the telluric fluorescent pseudomonas spp. populations is influenced by the plant and soil. Indeed, the selection of particular taxa under the effect of the plant genotype was already. The plant modifies the physical - chemical characters of the rhizoplan misleading a modulation of the density and the microbial activity. The particular conditions of the rhizosphere exercise specific actions and encourage some groups. Soil influences the interactions plant-microorganisms. Many works showed a difference between the fluorescent Pseudomonas spp. populations associated with the rhizosphere of many plants in different soils. We put in evidence influences of the plant and soil on the selection of the populations of fluorescent Pseudomonas spp.. It is admitted that a very big diversity exists at the rhizospherical fluorescent Pseudomonads spp. and that the phenotypic methods used for their taxonomic are insufficient. In this work, the rhizosphere effect on the bacterial populations has been analyzed at the phenotypic and taxonomic levels on a collection of fluourescents Pseudomonas spp. strains isolated of different biotopes. The definition of the biotope is based on the soil characteristics of the region in Algeria and the type of plant.

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