Solubilization of CaHPO4 and AlPO4 by Aspergillus niger in culture media with different carbon and nitrogen sources

Brazilian Journal of Microbiology

Cinthya Babá Barroso²  Gener Tadeu Pereira¹  Ely Nahas¹ 

[1] ,UNESP FCAV Programa de PG em MicrobiologiaJaboticabal SP ,Brazil

关键词: nutrition;    phosphorus;    phosphate source;    phosphate solubilization;    titratable acidity;    acidez titulável;    fonte de fosfato;    fósforo;    nutrição;    solubilização de fosfato;   

DOI  :  10.1590/S1517-83822006000400006

来源: SciELO

【 摘 要 】

The solubilization of inorganic phosphates by microorganisms supplies phosphates for plant nutrition and increases their growth. The solubilization of CaHPO4 (Ca-P) and AlPO4 (Al-P) by Aspergillus niger using several carbon and nitrogen sources was studied. Solubilization of Ca-P was enhanced when the carbon sources were mannitol, maltose, galactose and glucose (in that order). Galactose, sucrose and maltose were the carbon sources that enhanced the solubilization of Al-P. More extensive growth, acid production, and decrease in pH were obtained in the Al-P medium than in the Ca-P medium, however, the quantity of solubilized phosphate was 12% less. Phosphate solubilization was related to acid production, pH drop and fungal growth in the culture medium. The results of a study carried out under abiotic conditions showed that organic acids solubilize more Ca-P than Al-P. Evaluating the effect of the nitrogen source, the solubilization of Ca-P or Al-P decreased in the following order: glycine > NH4Cl > NaNO3 and NH4NO3 > urea > (NH4)2SO4, respectively. Ammoniacal nitrogen (NH4+-N) sources were the most effective in the production of acids and in lowering of the pH.

【 授权许可】

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