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Caractérisation de la communauté fongique impliquée dans la minéralisation du soufre organique dans les rhizosphères de colza et d'orge

Abstract : In Western Europe, sulfur (S) deficiency occurs in certain crops, including crucifers and cereals. Therefore, S becomes limiting for crop production and plants exhaust S mainly from soil organic S. In soil, 95% of S is in organic form that is not readily available for plants. This organic form containing principally ester S requires microbial mineralization to sulfate by arylsulfatase (ARS) enzyme. Our objectives were to characterize the fungal community having the ARS activity in the rhizosphere of rape versus that of barley. Functional fungal community comprised several genera principally belonging to Ascomycota. In different fungal strains, ARS activity was detected in different cellular compartments. The regulation of ARS was mostly dependent on microbial taxa. The density of the functional fungal community was not influenced by rhizospheric compartment.In soils, total and intracellular ARS activities were negatively correlated with soil sulfates whereas soil extracellular ARS activity was independent of sulfates. The overall results suggest that the functional fungal community could play a role in the dynamics of S in agricultural soils. Further approaches should be developed to allow a better understanding of their potential involvement in S nutrition of crops
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Lama Hamdan. Caractérisation de la communauté fongique impliquée dans la minéralisation du soufre organique dans les rhizosphères de colza et d'orge. Sciences agricoles. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL067N⟩. ⟨tel-01748843⟩

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