Rhizosphere bacterial populations of metallophyte plants in heavy metal-contaminated soils from mining areas in semiarid climate |
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Authors: | Rhizlane Bennisse Marc Labat Abdelghani Elasli Fatiha Brhada Fatiha Chandad Pierre-Pol Liegbott Mohamed Hibti Abdel-illah Qatibi |
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Institution: | (1) Microbiological Engineering Group, Faculty of Sciences and Techniques, Cadi Ayyad University, Maroc;(2) Post Harvest Microbial Biotechnology, Microbiology Laboratory, IRD-UR119, IFR-BAIM, Universités de Provence et de la Méditerranée, ESIL case 925, 163, avenue de Luminy, France;(3) School of Science and Engineering, Al Akhawayn University, Morocco;(4) Microbiology and Molecular Biology Laboratory, Faculty of Sciences, Mohamed V University, Morocco;(5) Faculté de médecine dentaire GREB, Université Laval, Canada;(6) Département de Géologie, Faculté des Sciences Techniques, Maroc |
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Abstract: | Rhizosphere bacterial populations associated with four metallophyte plants in one of major polymetallic (Pb–Zn–Cu) semiarid Moroccan Hercynian province (Draâ Sfar, Marrakech, Morocco) presenting long-term contamination mainly with Zn and Pb were analysed and compared to selected control soils. In the highly Zn-, Cu-, Pb- and Cd- contaminated soils, the total number of culturable heterotrophic bacteria were found in low proportions (< 2.6 × 102 – 1.6 × 104 g–1soil). This bacterial content was slightly similar to that found in moderately polluted and controls soils (6.7 × 104 – 5.8 × 106). However, the bacterial diversity and the rhizosphere/soil ratio, which compares the bacterial content (or bacterial charge) around the metallophyte plants with that in non-rhizosphere soil, were the bacteriological parameters mostly affected by heavy metal contamination. The chronic Zinc-stress results in an increase of tolerance to this metal of both the rhizosphere and non-rhizosphere bacterial communities. However, in general, the rhizosphere bacterial populations exhibited less tolerance to Zn toxicity than the bacterial population of non-rhizosphere soils. This result suggests that toxic effects of Zn decrease in the rhizosphere soils of the metallophyte plants. |
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Keywords: | Bacteria heavy metals metallophyte plants rhizosphere semiarid climate Zn-tolerance |
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