Details

Autor(en) / Beteiligte

• Mrabet, Moncef
• Mnasri, Bacem
• Romdhane, Samir Ben
• Laguerre, Gisèle
• Aouani, Mohamed Elarbi
• Mhamdi, Ridha

Titel

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

Ist Teil von

• FEMS microbiology ecology, 2006-05, Vol.56 (2), p.304-309

Ort / Verlag

Oxford, UK: Blackwell Publishing Ltd

Erscheinungsjahr

2006

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• 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.