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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2008, 29 (5)                                     Back

Interactions between marine facultative epiphyte Chlamydomonas sp

Process 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, India

3Department of Botany and Microbiology, Gurukul Kangri University, Hardwar - 249 404, India


(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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