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SUMMARY: Certain sub-lines of a strain of Salmonella paratyphi C contain 10% or more of motile flagellated bacteria when in exponential growth at 37°. Less than 0°1% of the organisms are motile after prolonged exponential growth at 20°. Single motile organisms isolated from cultures grown at 37° transmitted motility to only one or a few of their descendants during growth at 20°; they behaved as if their motility were due to non-multiplying motility-conferring (MC) particles. There is a good correlation between the distributions of number of MC particles/motile bacterium as indicated by the numbers of motile descendants at 20°, and the distributions of number of flagella/flagellated bacterium in stained preparations. It is inferred that one MC particle corresponds to one flagellum. The results support the hypotheses that in some cases flagella arise as a consequence of discontinuous intra-cellular events, each of which leads to the synthesis of a small number of flagella, and that parental flagella are shared amongst progeny bacteria until no descendant has more than one flagellum derived from a parental cell several generations removed. This sharing is not detected unless synthesis of new flagella ceases whilst bacterial growth continues. Single flagella may be unilinearly transmitted for over 20 generations.

The Unilinear Transmission of Motility and its Material Basis in Salmonella