Abstract

A flagellar gene cluster fragment includingflbD ofAzospirillum brasilense was cloned and sequenced. TheflbD mutant strain was found to be nonmotile—losing both polar and lateral flagella (Fla−Laf−). Motility and flagella were regained by complementation with plasmid-borne multicopyflbD, but altered with larger swarming circle and fewer lateral flagella on the semisolid plate. This result indicated that FlbD plays an important role in the regulation of both polar and lateral flagellar biosynthesis inA. brasilense.

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