SUMMARY: In certain strains of Rhizobium spp., tiny spherical swarmers, with a central nucleus and one or occasionally two flagella, are released from the cell lumen of specialized large bacilli, the barred forms, of which the bars are modified crosswalls. The swarmers exhibit appearances suggestive of conjugation.

In other strains true swarmers are not produced; their function is performed bysmall motile cells produced by normal cell division.


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