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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Bennisse, R., Labat, M., Elasli, A. et al. Rhizosphere bacterial populations of metallophyte plants in heavy metal-contaminated soils from mining areas in semiarid climate. World Journal of Microbiology and Biotechnology 20, 759–766 (2004). https://doi.org/10.1007/s11274-004-5812-2
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DOI: https://doi.org/10.1007/s11274-004-5812-2