Changes in Azospirillum brasilense motility and the effect of wheat seedling exudates.

摘要: Summary The rhizobacterium Azospirillum brasilense Sp245 swims, swarms (Swa + phenotype) or, very rarely, migrates with the formation of granular macrocolonies (Gri phenotype). Our aims were (i) to identify mutants that swarm faster than parent strain or differ from it in mode spreading and (ii) compare mutants’ responses wheat seedling exudates. In isotropic liquid media, swimming speeds all motile A. strains not influenced by However, exudates significantly stimulated swarming Sp245. several mutants, superswarming phenotype was insensitive local colonial density presence An polar-flagellum-defective Gri mutant BK759.G gave rise stable Swa ++ derivatives restored flagellum production. This transition concurrent plasmid rearrangements rate affected their colonies but