Search results for "STRUCTURE DU GENOME"
showing 3 items of 3 documents
Copper Dynamics and Impact on Microbial Communities in Soils of Variable Organic Status
2008
International audience; The effect of soil organic status on copper impact was investigated by means of a microcosm study carried out on a vineyard soil that had been amended with varying types of organic matter during a previous long-term field experiment. Soil microcosms were contaminated at 250 mg Cu kg−1 and incubated for 35 days. Copper distribution and dynamics were assessed in the solid matrix by a sequential extraction procedure and in the soil solution by measuring total and free exchangeable copper concentrations. Copper bioavailability was also measured with a whole-cell biosensor. Modifications of microbial communities were assessed by means of biomass-C measurements and charact…
Combining ecophysiological and microbial ecological approaches to assess interaction between genotypes of Medicago truncatula and the soil bacterial …
2011
International audience; Microbial communities can play a key role in sustainable agriculture by improving crop growth. Currently, a major stake is to study the effect of the plant genotype on the shaping of the soil microbial communities in relation to the plant nutrition. Methods: The links between the plant genotype and the rhizospheric bacterial communities were assessed at both structural and functional level using a multidisciplinary approach. On the one side, the genetic structure (Automated Ribosomial Intergenic Spacer Analysis (ARISA)) and diversity (454 pyrosequencing) of bacterial communities of the rhizosphere was first analysed. On the other side, using an ecophysiological model…
Effect of arbuscular mycorrhiza establishment on the genetic structure and diversity of bacteria in the rhizosphere of Medicago truncatula
2007
National audience; The rhizosphere is the volume of soil which is influenced by plant root activity. Plant roots release 20% of the photosynthates into the rhizosphere. This process sustains the development of an active free living microflora in the rhizosphere compared to the bulk soil. Plants establish also symbiotic associations with soil microorganisms. Arbuscular mycorrhizas (AM) are mutualistic symbioses between soil fungi and plant roots. AM contribute to plant adaptation to low fertility environments. AM are established by 80% of terrestrial plant families including major crop plants. AM are also ancient symbiosis (400 million years). AM are known to be non-specific associations. Ho…