Solubilization of iron and calcium phosphates by soil fungi isolated from coffee plantations |
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| Authors: | Raúl Hernando Posada Gabriela Heredia-Abarca Ewald Sieverding Marina Sánchez de Prager |
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| Institution: | 1. Instituto de Ecología A.C. , Xalapa , México raulposada@hotmail.com;3. Instituto de Ecología A.C. , Xalapa , México;4. Institute of Plant Production and Agroecology in the Tropics and Subtropics, University of Hohenheim , Stuttgart , Germany;5. Departamento de Ciencias Biológicas , Universidad Nacional de Colombia , Palmira , Colombia |
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| Abstract: | Almost 900 fungal isolates were obtained from eight coffee plantations in Colombia and Mexico. Of these, 76 isolates showed activity to solubilize Ca3(PO4)2 (PCa) and FePO4·H2O (PFe), which had been added to agar in a plate test. Generally, PCa was better solubilized than PFe. Colombian isolates were generally somewhat less effective than Mexican isolates. The two most effective isolates from each country with apparent highest PFe, solubilization potential were selected and cultivated in liquid medium containing PFe, which is more prevalent in tropical soils. The pH value, solubilized P in the medium and P uptake in fungal biomass were determined. After 24 days, Cylindrocarpon didymum and C. obtusisporum (both from Colombia) had solubilized 9.9 and 6.4 mg PO4 3--P L?1 and took up 8.6 and 11.6 mg P in biomass. Penicillium janthinellum and Paecilomyces marquandii (both from Mexico) solubilized 7.0 and 1.9 mg PO4 3--P L?1 and took up 11.3 and 17.3 mg P in biomass. The potential practical use of the four fungal isolates for different strategies in making more P available for coffee growth is discussed. |
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| Keywords: | Paecilomyces Penicillium Fusarium Cylindrocarpon fungal biotechnology |
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