Agrobacterium strains isolated from root nodules of common bean specifically reduce nodulation by Rhizobium gallicum - Université de Bourgogne Accéder directement au contenu
Article Dans Une Revue FEMS Microbiology Ecology Année : 2006

Agrobacterium strains isolated from root nodules of common bean specifically reduce nodulation by Rhizobium gallicum

Résumé

In a previous work, we showed that non-nodulating agrobacteria strains were able to colonize root nodules of common bean. Both rhizobia and agrobacteria co-existed in the infected nodules. No impact on symbiosis was found in laboratory conditions when using sterile gravel as a support for growth. In this study, soil samples originating from different geographic and agronomic regions in Tunisia were inoculated with a mixture of agrobacteria strains isolated previously from root nodules of common bean. A significant effect on nodulation and vegetal growth of common bean was observed. Characterization of nodulating rhizobia and comparison with non-inoculated controls showed a biased genetic structure. It seemed that Rhizobium gallicum was highly inhibited, whereas nodulation by Sinorhizobium medicae was favored. Co-inoculation of non-sterile soils with R. gallicum and agrobacteria confirmed these findings. In vitro antibiosis assays indicated that agrobacteria exercised a significant antagonism against R. gallicum.

Dates et versions

hal-02667106 , version 1 (31-05-2020)

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Moncef Mrabet, Bacem Mnasri, Samir Ben Romdhane, Gisele Laguerre, Mohamed Elarbi Aouani, et al.. Agrobacterium strains isolated from root nodules of common bean specifically reduce nodulation by Rhizobium gallicum. FEMS Microbiology Ecology, 2006, 56 (2), pp.304 - 309. ⟨10.1111/j.1574-6941.2006.00069.x⟩. ⟨hal-02667106⟩
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