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Effect of various
parameters on the efficiency of zinc phosphate
solubilization by indigenous bacterial isolates
Sadaf Shahab* and Nuzhat Ahmed
Centre for Molecular Genetics, University of Karachi, 75270,
Pakistan.
*Corresponding author. E-mail:
sadaf_shahab99@yahoo.com. Fax: 92-21-4966045.
Accepted 4 March, 2008 |
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Zinc phosphate
solubilization efficiency of ten soil bacteria were studied
for various parameters like carbon sources, temperature, pH,
variable concentration of sodium chloride and glucose. For
majority of the isolates 20oC was appeared to be
the optimum temperature for solubilization of zinc
phosphate. Glucose was the most favorable carbon source for
solubilization while lactose is the least favorable carbon
source. pH 7 was the most favorable pH for solubilization
while at pH 4 no growth and solubilization was seen. Except
CMG859, no isolate solubilized at pH 8 and 9. CMG851 (Acinetobacter
lwoffi) and CMG852 showed enhanced solubilization in
presence of 1% sodium chloride. 1% glucose is required for
the solubilization of zinc phosphate and no solubilization
was appeared in presence of 0.1% glucose. CMG851 (A.
lwoffi), CMG 860 (pseudomonas aeruginosa) CMG 857
(Bacillus thuringiensis) were found to be the most
promising isolates.
Key words:
Solubilization, zinc phosphate, carbon sources,
Acinetobacter lwoffi, pseudomonas aeruginosa, Bacillus
thuringiensis. |
