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Alfalfa root colonization by S. meliloti mutant strains in competition with wild-type strain Rm1021. (A) Rm1021 (550 CFU/seed) (•) and Rm1021-S10 (557 CFU/seed) (■) were coinoculated on day 0. (B) Rm1021 (311 CFU/seed) (•) and Rm1021-S11 (361 CFU/seed) (■) were coinoculated on day 0. In both cases, mutant-to-Rm1021 ratios measured on the roots 6 days later were significantly lower (P ≤ 0.01) than were those predicted for equally competitive cells.
