Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 38, Issue 9, Pages 2645-2654Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2006.03.020
Keywords
calcium phosphate-solubilizing microorganisms; Burkholderia sp.; Burkholderia caribiensis; brushite; hydroxyapatite; high-phosphorus iron ore
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Two strains of bacteria (Burkholderia sp., strain FeGL01, and Burkholderia caribiensis, strain FeGL03) were isolated from a Brazilian high phosphorus iron ore. The capacity of both strains to solubilize hydroxyapatite, Cas(PO4)(3)(OH), was assessed in plate and batch cultures. In batch cultures, the concentration of solution-P showed two kinetics: an initial one, characterized by a continuously increasing kinetics and a second one, characterized by oscillatory kinetics. To understand the nature of these oscillations, phosphatic residues in the spent broth were collected before, during and after the oscillations, and characterized using scanning electron microscopy (SEM), energy-dispersive X-ray chemical microanalyses (EDX) and X-ray diffraction (XRD). From these studies, it was found that drops in P concentration were related to the formation of an intermediate phosphate in the residues, identified as brushite, CaHPO4. 2H(2)O. Later increase of available P in the solution was found to be a consequence of re-dissolution of brushite crystals previously formed. Recrystallization of brushite was also detected in plate cultures after 12-14 days of incubation (c) 2006 Elsevier Ltd. All rights reserved.
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