Rock Phosphate Solubilisation by Strains of Penicillium Spp. Isolated from Farm and Forest Soils of three Agro Ecological Zones of Cameroon
American Journal of Agriculture and Forestry
Volume 2, Issue 2, March 2014, Pages: 25-32
Received: Jan. 24, 2014; Published: Feb. 28, 2014
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Fankem Henri, Department of Plant Biology, Faculty of Science, University of Douala, Douala, Cameroon
Ngo Nkot Laurette, Department of Plant Biology, Faculty of Science, University of Douala, Douala, Cameroon
Nguesseu Njanjouo Ghislain, Department of Plant Biology, Faculty of Science, University of Douala, Douala, Cameroon
Tchuisseu Tchakounte Gylaine Vanessa, Department of Plant Biology, Faculty of Science, University of Douala, Douala, Cameroon
Tchiazé Ifoué Alice Virginie, Department of Plant Biology, Faculty of Science, University of Douala, Douala, Cameroon
Nwaga Dieudonné, Department of Plant Biology and Physiology, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon
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Rock Phosphate (RP) is theoretically the cheapest fertilizer and most abundant, but its direct application in the soils is not always agronomically effective due to its low phosphorus (P) availability. An environmentally friendly and economically alternative to traditional processing of these deposits is the use of Phosphate Solubilising Microorganisms (PSM). Three Penicillium strains were screened for their aptitude in solubilising sparingly soluble phosphates as well as phosphate rock on plates and in broth supplemented with the different phosphate types. The three strains show the ability in solubilising at least two from the sparingly soluble phosphates types, with the solubilisation index (SI) varying from 1.44 to 4.74. All the strains were able to show halo zone on plates supplemented with Malian and Algerian rock phosphates with solubilisation index ranging from 1.2 to 1.8. No halo zone was detected on plates with Moroccan rock phosphate as sole phosphate source. However, significant amount of phosphorus were mobilised by all strains in broth with the different rock phosphates, including the Moroccan rock phosphate. The amount of solved P varied from 257.46 mgP.L-1 (Penicillium sp. 43) to 326.65 mgP.L-1 (Penicillium sp. 109) for Malian rock phosphate, from 152.61 mgP.L-1 (Penicillium sp. 43) to 337.56 mgP.L-1 (Penicillium sp. 27) for Algerian rock phosphate, and from 283.79 mgP.L-1 (Penicillium sp. 43) to 347.16 mgP.L-1 (Penicillium sp. 109) for Moroccan rock phosphate. The rock phosphate solubilisation was associated with pH media drop and both parameters were strongly correlated.
Penicillium Spp, Rock Phosphates, Fixed Phosphates, Phosphate Solubilisation
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Fankem Henri, Ngo Nkot Laurette, Nguesseu Njanjouo Ghislain, Tchuisseu Tchakounte Gylaine Vanessa, Tchiazé Ifoué Alice Virginie, Nwaga Dieudonné, Rock Phosphate Solubilisation by Strains of Penicillium Spp. Isolated from Farm and Forest Soils of three Agro Ecological Zones of Cameroon, American Journal of Agriculture and Forestry. Vol. 2, No. 2, 2014, pp. 25-32. doi: 10.11648/j.ajaf.20140202.12
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