Abstract
A pot experiment was realized to study the effect of two free-living microorganisms, a bacterium (B) and a Fungus (F), having an interest for rhizosphere biology, on the different stages of Glomus mosseae and Glomus fasciculatum development in Medicago sativa. Both (F) and (B) increased the formation of VAM by G. mosseae and both decreased the establishment of G. fasciculatum in roots of Medicago sativa. A positive effect of either (F) and (B) in increasing the number of spores from both mycorrhizal inocula was found. The reported results confirm that soil rhizosphere microorganisms-VA mycorrhizal fungi interactions occur in which the effects are selective for each associated couple of VAM fungus-saprophyte organism.
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