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Microbial Ecology

, Volume 61, Issue 2, pp 277–285 | Cite as

The Genetic Diversity of Culturable Nitrogen-Fixing Bacteria in the Rhizosphere of Wheat

  • Anastasia Venieraki
  • Maria Dimou
  • Panagiotis Pergalis
  • Io Kefalogianni
  • Iordanis Chatzipavlidis
  • Panagiotis KatinakisEmail author
Environmental Microbiology

Abstract

A total of 17 culturable nitrogen-fixing bacterial strains associated with the roots of wheat growing in different regions of Greece were isolated and characterized for plant-growth-promoting traits such as auxin production and phosphate solubilization. The phylogenetic position of the isolates was first assessed by the analysis of the PCR-amplified 16S rRNA gene. The comparative sequence analysis and phylogenetic analysis based on 16S rRNA gene sequences show that the isolates recovered in this study are grouped with Azospirillum brasilense, Azospirillum zeae, and Pseudomonas stutzeri. The diazotrophic nature of all isolates was confirmed by amplification of partial nifH gene sequences. The phylogenetic tree based on nifH gene sequences is consistent with 16S rRNA gene phylogeny. The isolates belonging to Azospirillum species were further characterized by examining the partial dnaK gene phylogenetic tree. Furthermore, it was demonstrated that the ipdC gene was present in all Azospirillum isolates, suggesting that auxin is mainly synthesized via the indole-3-pyruvate pathway. Although members of P. stutzeri and A. zeae are known diazotrophic bacteria, to the best of our knowledge, this is the first report of isolation and characterization of strains belonging to these bacterial genera associated with wheat.

Keywords

Azospirillum Gluconic Acid Phosphate Solubilization nifH Gene Acetylene Reduction Assay 
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.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Anastasia Venieraki
    • 1
  • Maria Dimou
    • 1
    • 2
  • Panagiotis Pergalis
    • 1
  • Io Kefalogianni
    • 2
  • Iordanis Chatzipavlidis
    • 2
  • Panagiotis Katinakis
    • 1
    • 2
    Email author
  1. 1.Laboratory of Molecular Biology, Department of Agricultural BiotechnologyAgricultural University of AthensAthensGreece
  2. 2.Laboratory of General and Agricultural Microbiology, Department of Agricultural BiotechnologyAgricultural University of AthensAthensGreece

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