Current Microbiology

, Volume 70, Issue 2, pp 219–227 | Cite as

Flagellar-Dependent Motility in Mesorhizobium tianshanense is Involved in the Early Stage of Plant Host Interaction: Study of an flgE Mutant

  • Huiming ZhengEmail author
  • Yiling Mao
  • Jiao Teng
  • Qingcheng Zhu
  • Jun Ling
  • Zengtao ZhongEmail author


Bacterial motility is most likely a critical factor for rhizobium to chemotactically colonize on the root surface prior to infecting leguminous plant hosts. Several studies of the rhizobium flagellar filament have been reported, but little is known about the rhizobium flagellum hook. To investigate the roles of the hook protein in flagellum synthesis in Mesorhizobium tianshanense, the hook protein-encoding gene flgE of M. tianshanense was amplified by PCR and sequenced. Comparison of the deduced amino acid sequences revealed pronounced similarities in Domain 1 and lower similarities in Domain 2, which are supposed to be related to hook structure assembly and antigenic diversity, respectively. The level of transcription of flgE increased along with the cell growth and reached its maximum at the middle log phase. Disruption of the flgE gene caused a flagellar-less phenotype, thereby causing complete loss of swimming ability, modified nutrient-related swarming ability and biofilm formation. Moreover, the absence of flagellar caused decreased bacterial attachment on the root hair, suggesting that flagellar is involved in the early stage of symbiosis process.


Rhizobium Flagellar Filament Flagellum Synthesis lacZ Transcriptional Fusion Hook Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Dr. Jun Zhu for helpful discussion, and Dr. Yunduan Wang for the gene sequence determination. This study was supported by a 973 project (CB126502, to J.Z.), the Ph.D. programs foundation of the Ministry of Education (MOE) (20120097110016, to J.Z.), and an NSFC award (31170077, to Z.Z).

Supplementary material

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Supplementary material 1 (DOCX 753 kb)


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of MicrobiologyNanjing Agricultural UniversityNanjingChina

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