Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Sep 2008, 29 (5) BackProcess of rock phosphate solubilization by Aspergillus
sp PS 104 in soil amended medium S.C. Kang1, Piyush
Pandey2, Rajat Khillon3 and D.K. Maheshwari*3 1Division
of Food, Biological and Chemical Engineering, College of Engineering, Daegu University, Gyeongsan City
- 712-714, Republic of Korea 2Department
of Microbiology, SBSPGI of Biomedical Sciences and Research, Balawala, Dehradun - 248 161, 3Department
of Botany and Microbiology, (Received: May 13, 2007;
Revised received: October 02, 2007; Accepted: December 08, 2007) Abstract: Aspergillus sp PS 104, a soil isolate had excellent
potential to solubilize rock phosphate in vitro. The
process was influenced by the presence of various concentrations of local loess
(red soil). The simultaneous occurrence, in our experiment, of high levels of solubilized phosphate and synthesized citric acid, together
with the lowest reached pH values, confirmed the role of citric acid in the
phosphate solubilization mechanism. When the soil was
present, phosphate release was better correlated than citrate synthesis with H+ concentration. Changes in soluble phosphate concentration did not
follow a sigmoid pattern. The ability of organism to release phosphatase was also studied. An interesting relationship
was observed between the two processes of phosphate mobilization: citric acid
synthesis and phosphatase production. Key words:
Aspergillus sp PS-104, Phosphate solubilization, Loess,
Citrate, Phosphatases PDF of full length paper is available with author
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