%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Bennisse, R.
%A Labat, Marc
%A Elasli, A.
%A Brhada, F.
%A Chandad, F.
%A Lorquin, J.
%A Liegbott, P. P.
%A Hibti, M.
%A Qatibi, A. I.
%T Rhizosphere bacterial populations of metallophyte plants in heavy metal-contaminated soils from mining areas in semiarid climate
%D 2004
%L fdi:010088408
%G ENG
%J World Journal of Microbiology and Biotechnology
%@ 0959-3993
%K bacteria ; heavy metals ; metallophyte plants ; rhizosphere ; semiarid climate ; Zn tolerance
%M CC:0002251868-0016
%N 7
%P 759-766
%R 10.1007/s11274-004-5812-2
%U https://www.documentation.ird.fr/hor/fdi:010088408
%> https://www.documentation.ird.fr/intranet/publi/2023-07/010088408.pdf
%V 20
%W Horizon (IRD)
%X Rhizosphere bacterial populations associated with four metallophyte plants in one of major polymetallic (Pb-Zn-Cu) semiarid Moroccan Hercynian province (Draa 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 x 10(2)-1.6 x 10(4) g(-1) soil). This bacterial content was slightly similar to that found in moderately polluted and controls soils (6.7 x 10(4) - 5.8 x 10(6)). 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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