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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Maltouf, A. Filali El Aafi, N. Saidi, N. Pajuelo, E. Perez-Palacios, P. Dary, M. Brhada, F. |
| Spatial Coverage | Morocco |
| Description | Author Affiliation: El Aafi N ( Laboratory of Microbiology and Molecular Biology, Faculty of Sciences, University Mohamed V at Agdal, Rabat, Morocco, najlaelaafi@yahoo.fr.) |
| Abstract | The aim of this work was using the legume plant Anthyllis vulneraria L. (ecotype metallicolous) as a trap plant, in order to isolate metal-tolerant rhizobial strains from metal-contaminated soils from Morocco, with pollution indexes spanning three orders of magnitude. As bioindicator, soil bacterial density was inversely correlated to the pollution index. Forty-three bulk soil bacteria and sixty two bacteria from nodules were isolated. The resistance of bacteria from nodules to heavy metals was four to ten times higher than that of bulk soil bacteria, reaching high maximum tolerable concentrations for Cd (2 mM), Cu (2 mM), Pb (7 mM), and Zn (3 mM). Besides, some strains show multiple metal-tolerant abilities and great metal biosorption onto the bacterial surface. Amplification and restriction analysis of ribosomal 16S rDNA (ARDRA) and 16S ribosomal DNA (rDNA) sequencing were used to assess biodiversity and phylogenetic position among bacteria present in nodules. Our results suggest that a great diversity of non-rhizobial bacteria (alpha- and gamma-proteobacteria) colonize nodules of Anthyllis plants in contaminated soils. Taking together, our results evidence that, in polluted soils, rhizobia can be displaced by non-rhizobial (and hence, non-fixing) strains from nodules. Thus, the selection of metal-resistant rhizobia is a key step for using A. vulneraria symbioses for in situ phytoremediation. |
| ISSN | 09441344 |
| Issue Number | 6 |
| Volume Number | 22 |
| e-ISSN | 16147499 |
| Journal | Environmental Science and Pollution Research |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2015-03-01 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Fabaceae Microbiology Mining Rhizobium Isolation & Purification Metabolism Soil Pollutants Analysis Soil Chemistry Symbiosis Base Sequence Biodegradation, Environmental Biodiversity Metals, Heavy Molecular Sequence Data Morocco Phylogeny Polymorphism, Restriction Fragment Length Population Density Rna, Ribosomal, 16s Genetics Physiology Sequence Analysis, Dna Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science Discipline Environmental Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine |
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