Mise en évidence de la solubilisation du zinc par des bactéries de sol

Abstract

The ability of zinc solubilising bacteria to solubilise zinc is considered one of the most important traits associated with plant nutrition. These bacteria play an important role in the supply of zinc to plants. The objective of the present study was to isolate zinc solubilising bacteria and to identify the presence of traits involved in plant growth promotion. In the course of our work, 13 bacterial strains were isolated from the rhizosphere of courgette, garlic, bean and beetroot from the region of the wilaya of Mostaganem, among which 11 isolates showed a positive response to Zn solubilisation on Bunt and Rovira medium modified with Zinc oxide as the only Zn source. They were selected on the basis of clear halozone and colony diameter, these isolates showed a maximum Zn content equivalent to303 a ± 6.08 μg/ml in isolate DY8. The isolates were then evaluated for their plant growth promotion traits such as solubilisation, ability to fix atmospheric nitrogen, IAA production and HCN acid production. The results show, indeed, that phosphate solubilisation and IAA production were detected in most of the bacterial isolates.