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Bacterial strains used in this study
| Strain | Species | Geographical origin | Host plant of isolation |
| Rm 1021 | S. meliloti | Galibert et al. 2001 | Sequenced strain |
| AK83 | S. meliloti | North Aral Sea, Kazakhstan | Medicago falcata |
| AK58 | S. meliloti | North Aral Sea, Kazakhstan | Medicago falcata |
| BL225C | S. meliloti | Lodi, Italy | Medicago sativa |
| BO21CC | S. meliloti | Lodi, Italy | Medicago sativa |
