Polychlorinated biphenyls (PCBs) are recognized as persistent organic pollutants and accumulate in organisms, soils, waters, and sediments, causing major health and ecological perturbations. Literature reported PCB bio-transformation by fungi and bacteria in vitro, but data about the in situ impact of those compounds on microbial communities remained scarce while being useful to guide biotransformation assays. The present work investigated for the first time microbial diversity from the three-domains-of-life in a long-term contaminated brownfield (a former factory land).
View Article and Find Full Text PDFPlant growth-promoting rhizobacteria (PGPR) naturally aid plant growth, development and tolerance to stress. Yield increase by the commercial isolate Azospirillum lipoferum CRT1 was recently attributed to an enhanced sprouting success. In order to provide the first biochemical and physiological analysis of sprouting enhancement by PGPR, seed germination and metabolism were followed by time-lapse photography and GC/MS-based metabolomics, respectively, after inoculating two differentially-responding maize cultivars with A.
View Article and Find Full Text PDFPlant Growth-Promoting Bacteria (PGPB) of the genus Azospirillum are known to enhance root growth and yield in many plant species including cereals. To probe the underlying mechanisms, correlations between modifications of yield and 6-leaf plantlet characteristics were estimated on maize in four fields with contrasting soil properties over two consecutive years using the commercial isolate A. lipoferum CRT1.
View Article and Find Full Text PDFEperua falcata (Aublet), a late-successional species in tropical rainforest and one of the most abundant tree in French Guiana, has developed an original strategy concerning N-acquisition by largely preferring nitrate, rather than ammonium (H. Schimann, S. Ponton, S.
View Article and Find Full Text PDFWe investigated the power of near infrared (NIR) analysis for the quantitative assessment of soil quality in a wildfire chronosequence. The effect of wildfire disturbance and soil engineering activity of earthworms on soil organic matter quality was first assessed with principal component analysis of NIR spectra. Three soil quality indices were further calculated using an adaptation of the method proposed by Velasquez et al.
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