首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Changes in Azospirillum brasilense motility and the effect of wheat seedling exudates
Authors:Borisov Igor V  Schelud'ko Andrei V  Petrova Lilia P  Katsy Elena I
Institution:aLaboratory of Microbial Genetics, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russian Federation
Abstract: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 Sp245 mutants that swarm faster than the parent strain or differ from it in the mode of spreading and (ii) to compare the mutants’ responses to wheat seedling exudates. In isotropic liquid media, the swimming speeds of all motile A. brasilense strains were not influenced by the exudates. However, the exudates significantly stimulated the swarming of Sp245. In several Sp245 mutants, the superswarming phenotype was insensitive to local colonial density and to the presence of wheat seedling exudates. An A. brasilense polar-flagellum-defective Gri+ mutant BK759.G gave rise to stable Swa++ derivatives with restored flagellum production. This transition was concurrent with plasmid rearrangements and was stimulated in the presence of wheat seedling exudates. The swarming rate of the Swa++ derivatives of BK759.G was affected by the local density of their colonies but not by the presence of the exudates.
Keywords:Azospirillum brasilense  Wheat seedling exudates  Motility  Mutation
本文献已被 ScienceDirect PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号