Data/hora: 01/06/2024 03:45:41

Provedor de dados: | 58
País: | Brazil
Título: | Solubilization of CaHPO4 and AlPO4 by Aspergillus niger in culture media with different carbon and nitrogen sources
Autores: | Barroso,Cinthya Babá; Pereira,Gener Tadeu; Nahas,Ely.
Data: | 2006-12-01
Ano: | 2006
Palavras-chave: | Nutrition; Phosphorus; Phosphate source; Phosphate solubilization; Titratable acidity.
Resumo: | 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 &gt; NH4Cl &gt; NaNO3 and NH4NO3 &gt; urea &gt; (NH4)2SO4, respectively. Ammoniacal nitrogen (NH4+-N) sources were the most effective in the production of acids and in lowering of the pH.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000400006
Editor: | Sociedade Brasileira de Microbiologia
Relação: | 10.1590/S1517-83822006000400006
Formato: | text/html
Fonte: | Brazilian Journal of Microbiology  v.37 n.4 2006
Fonte: | info:eu-repo/semantics/openAccess