A sole-carbon-source catabolism assay (Biolog GN microplate) was used to study whether bacterial communities from the same vertic soil, but under different management history, showed distinctive patterns of C-substrate utilization. Two sampling depths (0–7.5 and 7.5–15 cm) were also investigated. The response of microbial communities to increasing periods of time — 16, 26 and 40 years (S2, S3, ...

The effects of heavy metals and phytoextraction practices on a soil microbial community were studied during 12 months using a hyperaccumulating plant (Thlaspi caerulescens) grown in an artificially contaminated soil. The 16S ribosomal RNA genes of the Bacteria and the beta-Proteobacteria and the amoA gene (encoding the alpha-subunit of ammonia monooxygenase) were PCR-amplified and analysed by d...

Co-inoculations of the alfalfa (Medicago sativa L.) plants with the associativeand/or the obligate nitrogen-fixing bacteria (Azospirillum brasilense, S; Rhizobium meliloti, R) and/or the vesicular arbuscular mycorrhiza fungus (Glomus fasciculatum, M) were evaluated in a pot experiment under controlled conditions. The effect of these beneficial microbes, as single(M, R, S), dual(MR, MS) or multi...

Exometabolomics enables analysis of metabolite utilization of low molecular weight organic substances by soil bacteria. Environmentally-based defined media are needed to examine ecologically relevant patterns of substrate utilization. Here, we describe an approach for the construction of defined media using untargeted characterization of water soluble soil microbial metabolites from a saprolite...

Soil biota can be important drivers of plant community structure. Depending on the balance between antagonistic and mutualistic interactions, they can limit or promote the success of plant species. This is particularly important in the context of exotic plant invasions where soil biota can either increase the biotic resistance of habitats, or they can shift the balance between exotic and native...

New Caledonia is known for the diversity of its geological substrates, which have shaped highly original and diverse flora. Here, effect soil on vegetation described several contact zones between ultramafic other substrates. The main formations soils derived from rocks are described: low medium altitude rainforests, high maquis. types maquis biological characteristics species also presented.

Observed on a 5 x 5 cm small surface of litter in a 35-years-old Scots pine stand with bracken and the moss Pseudoscleropodium purum, the F1 layer is extensively invaded by a mycelial mat made of several mycorrhizal fungi. Observations under a light microscope gave circumstantial evidence of the role of these fungi in advanced stages of decomposition: they seem to protect the partly decayed pla...

1 2 An avoidance test using the soil springtail Folsomia candida was used to assess 3 changes in contamination levels at low doses of PAHs following incubation with 4 indigenous microflora. A soil from a former coke site was diluted to 1% in an unpolluted 5 soil from the same site, which was used as a control, then both substrates were 6 remoistened to 80% field capacity. The diluted soil was p...

Listeria monocytogenes is a ubiquitous opportunistic pathogen responsible for listeriosis. In order to study the processes underlying its ability to adapt to the soil environment, whole-genome arrays were used to analyse transcriptome modifications 15 minutes, 30 minutes and 18 h after inoculation of L. monocytogenes EGD-e in soil extracts. Growth was observed within the first day of incubation...