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Isolation and Screening of Silicate Bacteria from Various Habitats for Biological Control of Phytopathogenic Fungi

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DOI: 10.4236/ajps.2015.618282    3,336 Downloads   4,213 Views   Citations

ABSTRACT

Silicate solubilizing bacteria (SSB) can play an efficient role in soil by solubilizing insoluble forms of silicates. In addition to this some SSB can also solubilize potassium and phosphates, hence increasing soil fertility and enhancing plant defense mechanisms. A total of 111 bacterial strains were isolated from various habitats of Pakistan and screened for solubilization of silicate, phosphate and potassium on respective media. Out of these, 35 bacterial isolates were capable of solubilizing either silicate, phosphate or potassium. Amongst these 7 bacterial isolates were capable of solubilizing all three minerals tested. The highest silicate (zone diameter 54 mm) and phosphate solubilization (zone diameter 55 mm) was observed for bacterial isolate NR-2 while the highest potassium solubilization was observed for NE-4b (zone diameter 11 mm). Dual culture antagonistic assays were carried out by using these bacterial isolates against four plant pathogenic fungi Magnaporthae grisae, Rhizoctonia solani, Altarnaria alternata and Macrophomina pheasolina. Mean zone of inhibition of these bacterial isolates against the four pathogenic fungi ranged between 4 mm to 39 mm. The largest zone of inhibition against all four bacterial strains was recorded for bacterial isolate NR-2 followed by NE-4b. These strains will be further investigated for their plant growth promoting activities in the future.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Naureen, Z. , Aqeel, M. , Hassan, M. , Gilani, S. , Bouqellah, N. , Mabood, F. , Hussain, J. and Y. Hafeez, F. (2015) Isolation and Screening of Silicate Bacteria from Various Habitats for Biological Control of Phytopathogenic Fungi. American Journal of Plant Sciences, 6, 2850-2859. doi: 10.4236/ajps.2015.618282.

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