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

Abstract : Over the past thirty years, Sulfur (S) has become one of the most limiting element for crop growth due to many factors, such as new soil management practices and depletion of the anthropogenic pollution. Thus, S deficiencies increase in crops, particularly in Western Europe. Our objectives were to apprehend the soil functional bacterial community which, by its arylsulfatase activity, allows the mineralization of the majority form of S to sulfate (form of S assimilated by plants). Based on our results, the density of the functional bacterial community are higher in environments where S is potentially limiting (rapeseed rhizosphere vs. barley rhizosphere). Moreover, this functional community appeared diverse and belonging to several taxonomic classes (Actinobacteria, firmicutes, a-, ß-, d-, -proteobacteria and Planctomycetea). In addition, in the rapeseed rhizosphere, temporal variations of the structure and diversity of this functional community have also been highlighted. In conclusion, our experiments appear to demonstrate that this functional bacterial community mineralizing sulphate esters appeared stimulated in rapeseed rhizosphere compared to that present in barley rhizosphere. However, the establishment of new approaches to allow additional functional ecology bases for this community should be made to allow a better understanding of its potential involvement in sulfur nutrition of crops
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https://hal.univ-lorraine.fr/tel-01748716
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Mickaël Cregut. Caractérisation de la communauté bactérienne impliquée dans la minéralisation du soufre organique dans les rhizosphères de colza et d'orge. Sciences agricoles. Institut National Polytechnique de Lorraine, 2009. Français. ⟨NNT : 2009INPL025N⟩. ⟨tel-01748716⟩

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