ArticleWorld journal of microbiology & biotechnology2025
Optimization of culture conditions impacting phosphate solubilization efficiency of bacterial isolates.
Article in World journal of microbiology & biotechnology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Abstract
Phosphate solubilizing bacteria (PSB) solubilize phosphorus through secretion of low molecular weight organic acids. This P solubilization is dependent on culture as well as environmental growth conditions. In the present study, five bacteria (Enterobacter cloacae BHUAS1, Bacillus cereus BHUAS2, Bacillus megaterium IESDBHUAS3, Bacillus megaterium IESDBHUAS4, and Bacillus megaterium IESDBHUAS5) were tested to solubilize inorganic P under variable culture conditions comprising different levels of salinity, pH, different sources of inorganic P, variable incubation temperatures and varying initial inoculum sizes under in vitro conditions. The bacterial strains were also checked for simultaneous production of Indole 3- acetic acid (IAA) and P solubilization to test for expression of multifarious beneficial traits under similar conditions. The results revealed that in different sources of insoluble inorganic P, calcium P was preferred source by all the bacterial strains where maximum phosphate solubilization efficiency (PSE) was observed. An exposure of 250 mM salinity was observed to increase PSE for Enterobacter cloacae BHUAS1 and Bacillus cereus BHUAS2 while it lowered the PSE of other isolates. A growth temperature of 30 °C was found suitable for all the isolates to express their highest PSE. In case of pH, Enterobacter cloacae BHUAS1 performed best at pH 7, Bacillus cereus BHUAS2 favoured pH 8, while Bacillus megaterium IESDBHUAS3, Bacillus megaterium IESDBHUAS4, and Bacillus megaterium IESDBHUAS5 preferred pH 9 for expression of their highest PSE. Considering inoculum size a cell density of 3 × 10
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