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Evaluation of antibacterial and antifungal potential of endophytic fluorescent Pseudomonas associated with Salvadora persica L. and Salvadora oleoides Decne

Farzana Korejo, Rubina Noreen, Syed Abid Ali, Fozia Humayun, Afshan Rahman, Viqar Sultana and Syed Ehteshamul-Haque

In the present study, cell-free culture filtrates of 35 isolates of endophytic fluorescent Pseudomonas, isolated from roots, shoots and leaves of Salvadora persica L. and  Salvadora  oleoides Decne were examined for antibacterial activity against Gram negative (Escherichia coli, Salmonella typhimurium) and Gram  positive  (Bacillus subtilis, Staphylococcus aureus) bacteria in-vitro. Most of them showed strong antibacterial activity by producing zone of inhibition. Cell free culture filtrates of  Pseudomonas  also  caused growth inhibition of root rotting fungi Macrophomina phaseolina, Rhizoctonia solani, Fusarium   solani  and F.oxysporum  by  producing zone of inhibition. Solvent fractions of 5 potential isolates were also evaluated for antibacterial activity. Both hexane and chloroform fractions of cell-free culture filtrates showed antibacterial and antifungal activity at varying degree. Endophytic fluorescent Pseudomonas offering important sources of antimicrobial compounds for pharmacological benefits, besides, their role in crop protection and plant growth.

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