P-solubilization activity of Rhizobium species strains
1999
Storkanova, G. | Vorisek, K. | Randova, D. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic)) | Mikanova, O.
12 strains of Rhizobium have been tested for their ability to solubilize hardly soluble inorganic phosphate as affected by the different level of water-soluble phosphate in the liquid submersed stationary cultures. After the incubation, the pH value in medium was determined, as well as the content of soluble phosphorus. Seven strains did not solubilize mineral tricalcium phosphate. The strains D560, D562 and D656 were able to solubilize tricalcium phosphate only without presence of the soluble source of phosphorus. Two strains D559 and D564, having ability to solubilize Ca3(PO4)2 also by the 5 mmol/l concentration of soluble phosphate in medium, were investigated in more details. Strain D559 showed the statistically significant ability of P-solubilization at following levels of KH2PO4 concentrations: 0, 2.5, 5, 7.5 mmol/l, strain D564 by 0, 2.5, 5 mmol/l. P-solubilization was linked with the statistically significant decrease of pH value.
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