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Colonization of roots (A,B) and epicotyl/stem base (C,D) of pea plants grown from seeds treated with E. coli strains 55989, 0611, or N112, either via seed submergence (A,C) or drop inoculation (B,D). Symbols: circle, strain 55989; square, strain 0611; triangle, strain N112. Numbers above symbols indicate the number of plants found to be positive for the presence of introduced E. coli strains, of five replicate plants.
