Production of citric and oxalic acids and solubilization of calcium phosphate by Penicillium bilaii

Article Abstract:

Factors contributing to phosphate solubilization were examined in Penicillium bilaii Chalabuda. Both the nutrient composition and buffering capacity of the medium affected the production of acidic metabolites which contribute to increased solubility. Citrate and oxalate were the major metabolites produced. Citrate was produced under nitrogen-limiting conditions, while oxalate was produced when carbon was limiting. Futhermore, citrate was produced in both log and stationary phases, while oxalate was produced only in the stationary phase. Sporulating cultures tended to produce less acid.

Physiological aspects, Citric acid, Oxalic acid

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Solubilization of phosphates and micronutrients by the plant-growth-promoting and biocontrol fungus Trichoderma harzianum Rifai 1295-22

Article Abstract:

A study was conducted to determine whether Trichoderma harzianum is able to solubilize various nutrients in vitro. This fungus was previously known to solubilize several soluble minerals and in reacting with chelating agents in other elements. It was also discovered that the chelating activity of the fungal culture can be determined by a method based on the measurement of the equilibrium concentration of the chrome azurol S complex with other chelating substances.

Fungi, Microbial biotechnology, Trace minerals (Nutrients)

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Manganese peroxidase-dependent oxidation of glyoxylic and oxalic acids synthesized by Ceriporiopsis subvermispora produces extracellular hydrogen peroxide

Article Abstract:

A study was conducted to determine the source of extracellular hydrogen peroxide essential for manganese peroxidase (MnP) activity and if hydrogen peroxide might be generated by MnP through the oxidation of organic acids secreted by the fungus. Results revealed that Ceriporiopsis subvermispora is made up of manganese peroxidase and laccase. The presence of oxalate and glyoxylate in the extracellular fluid of C. subvermispora cultures was likewise confirmed.

Manganese, Manganese (Metal), Hydrogen peroxide, Oxalates

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