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

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Abstract

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. © 2006 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved.

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Mrabet, M., Mnasri, B., Romdhane, S. B., Laguerre, G., Aouani, M. E., & Mhamdi, R. (2006). Agrobacterium strains isolated from root nodules of common bean specifically reduce nodulation by Rhizobium gallicum. In FEMS Microbiology Ecology (Vol. 56, pp. 304–309). https://doi.org/10.1111/j.1574-6941.2006.00069.x

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