Secretion of Organic Acids by Phosphate Solubilizing Bacteria

Irfan Dwidya Prijambada, Jaka Widada, Siti Kabirun, Donny Widianto

Abstract


Phosphorus availability is a major limiting for crop production.  Bacterial solubilization of insoluble inorganic phosphate has been studied as a means of providing available phosphorus for crop production.  Bacterial abilities to solubilize calcium phosphate and rock phosphate have been identified to be related with their abilities to produce gluconic acid and ketogluconic acid.  However, there is no information regarding the relationship between bacterial ability to solubilize aluminum phosphate and their ability to produce organic acids.  This study was conducted to investigate the relationship between bacterial ability to solubilize calcium and aluminum phosphates with their ability to produce organic acids.  Bacterial ability to solubilize calcium and aluminum phosphates were determined as the concentration of soluble phosphate in the filtrate of bacterial cultivation media, while bacterial ability to produce organic acids were assessed from the accumulated organic acids in its.  The results showed that bacterial abilities to solubilize calcium and aluminum phosphates well related to their abilities to produce organic acids.  Organic acids related with the solubilization of calcium phosphate differ from the ones related

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with the solubilization of aluminum phosphate.  Moreover, there is similarity in the production of organic acids related to the solubilization of aluminum phosphates and iron phosphate.

Keywords


Aluminum phosphate solubilization; calcium phosphate solubilization; organic acids production; phosphate solubilizing bacteria

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DOI: http://dx.doi.org/10.5400/jts.2009.v14i3.245-251

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