Abstract
Aspergillus awamori, a phosphate solubilizing filamentous fungas, isolated from waste mushroom bed of Agaricus bisporus in South Korea was immobilized using various immobilized forms such as calcium alginate, agar, ver-miculite and zeolite to assess the phosphate solubilizing potential in free and immobilized forms. Phosphate solubi-lization was carried out in repeated 48 hrs batch fermentation using the fungal strain. Among the four immobi-lized forms used, fungi immobilized with agar were shown to release the highest content of soluble phosphorus into the medium, followed vermiculite and sodium alginate. However phosphate solubilization of the fungal strain immobilized with zeolite was found to be very low. Thus, it can be concluded that a culture technique with immo-bilization especially with agar is more suitable for solubilization of inorganic phosphate by Aspergillus awamori than other forms.
Highlights
Phosphorus (P) is considered to be the second most important macro-nutrient for crops plays a key role in sustainable agricultural production systems
Though PSMs are naturally found in soils, their growth and phosphate solubilization highly vary with environmental conditions such as temperature, moisture content, pH, nutrient availability, salt concentration and availability of potentially toxic pollutants in the soils
Previous studies have demonstrated that some Aspergillus species posses the ability to solubilize inorganic phosphates, which subsequently results in increased availability of P for plant uptake (Yadav et al, 2011; Srividya et al, 2009; Relwani et al, 2008)
Summary
Phosphorus (P) is considered to be the second most important macro-nutrient for crops plays a key role in sustainable agricultural production systems. Though PSMs are naturally found in soils, their growth and phosphate solubilization highly vary with environmental conditions such as temperature, moisture content, pH, nutrient availability, salt concentration and availability of potentially toxic pollutants in the soils Inadequate abundance of such organisms makes difficulties in competing with other microbial species in the rhizosphere (Jain et al, 2012). Immobilization of microbial cells using various techniques such as covalent binding, WALPOLA BC AND ET AL: ASPERGULLUS IN INORGANIC PHOSPHATE SOLUBILIZATION physical adsorption and entrapment etc., could increase the effectiveness, successfulness and safeness of the applying microorganisms (Vassilev et al, 2001) It helps survival of microorganisms by protecting them against extreme fluctuations of environmental conditions. The present investigation was aimed at assessing the phosphate solubilizing potential of a filamentous fungus, Aspergillus awamori in various immobilized forms (free, entrapped and adsorbed forms) in in vitro condition
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