Behavior of fluorescent Pseudomonas under different concentrations of heavy metals (Zn and Cu)

Oubeidillah Youssoufa  Ali; Adiouma  Dangue; Demba  Diaw; Mame Arama Fall  Ndiaye; Tahir Abdoulaye  Diop

doi:10.30574/gscbps.2022.18.1.0048

Authors

Oubeidillah Youssoufa Ali Department of Plant Biology, Mushroom Biotechnology Laboratory, Faculty of Science and Technology, Cheikh Anta Diop University of Dakar, Dakar BP 5005, Senegal.
Adiouma Dangue Department of Plant Biology, Mushroom Biotechnology Laboratory, Faculty of Science and Technology, Cheikh Anta Diop University of Dakar, Dakar BP 5005, Senegal.
Demba Diaw Department of Plant Biology, Mushroom Biotechnology Laboratory, Faculty of Science and Technology, Cheikh Anta Diop University of Dakar, Dakar BP 5005, Senegal.
Mame Arama Fall Ndiaye Department of Plant Biology, Mushroom Biotechnology Laboratory, Faculty of Science and Technology, Cheikh Anta Diop University of Dakar, Dakar BP 5005, Senegal.
Tahir Abdoulaye Diop Department Higher School of Agricultural and Food Sciences, Amadou Mahtar MBOW University of Dakar, Diamniadio, Senegal.

DOI:

https://doi.org/10.30574/gscbps.2022.18.1.0048

Keywords:

Pseudomonas, Heavy metals, Tomato, Onion, Eggplant

Abstract

The use of chemical fertilizers has resulted in the depletion of soils in mineral elements and telluric microorganisms. Thus, for an improvement in crop growth, the exploitation of telluric microorganisms such as Pseudomonas can be an alternative.

Laboratory work has made it possible to isolate strains of Pseudomonas from the rhizospheres of tomato, eggplant and onion. These strains were also tested in the presence of different concentrations of certain metals (CuSO₄ and ZnSO₄ (0, 1, 3, 4, 5 and 6 mmol/l).

The tests carried out in the laboratory in the presence of Cu and Zn revealed a very significant reduction in the number of colonies of the strains of Pseudomonas for the concentrations of 5 and 6 mmol/l.

The results showed better zinc tolerance for both tomato and onion rhizosphere strains. In the presence of Cu, the strain isolated from tomato rhizosphere shows more tolerance to heavy metals. These results made it possible to isolate different strains of Pseudomonas and to specify their tolerance thresholds for heavy metals.

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