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  • Title: [K-release and weathering of muscovite by Cenococcum geophilum].
    Author: Peng Y, Song M, Pedruzzi I, Li P, Yu J.
    Journal: Wei Sheng Wu Xue Bao; 2015 Mar 04; 55(3):282-91. PubMed ID: 26065270.
    Abstract:
    OBJECTIVE: To use efficiently the insoluble K-bearing minerals in forest soil as nutrients for plant growth, we studied the weathering mechanism of muscovite by ectomycorrhizal fungi. METHODS: Cenococcum geophilum, Paxillus involutus, Laccaria bicolor, Pisolithus tinctorius, and Suillus tomentosus were used to dissolve muscovite in three culture mediums. Furthermore, K release from muscovite, biomass, remaining glucose, pH value andorganic acids were measured during the 21-day incubation of C. geophilum in Modified Melin-Norkrans ( MMN) culture medium. We also compared K release amounts, organic acids and polysaccharides in external environment with those in micro-environment after 15-day and 21-day bioleaching. The weathering phenomenon on muscovite surface was observed by Scanning Electron Microscope (SEM). RESULTS: Among five ectomycorrhizal fungi, C. geophilum showed the best K-releasing ability in MMN culture medium. Fungal biomass, remaining glucose and pH value had significantly effects on K release. With the aid of exopolysaccharides, the hypha adhered to the mineral surface forming the micro-environment. In the microenvironment, organic acids were concentrated to promote K-release from muscovite, and obvious weathering marks on muscovite surface were found by SEM image. CONCLUSION: Ectomycorrhizal fungi could weather muscovite to provide K-solubilizing microbial resource for plant growth, and the synergism action of hyphae, organic acids and polysaccharides would accelerate K mobilization.
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