Journal Article

Ecology and evolution of bacterial microdiversity

Michael Schloter, Michael Lebuhn, Thierry Heulin and Anton Hartmann

in FEMS Microbiology Reviews

Published on behalf of Federation of European Microbiological Societies

Volume 24, issue 5, pages 647-660
Published in print December 2000 |
Published online January 2006 | e-ISSN: 1574-6976 | DOI:

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Using high resolution molecular fingerprinting techniques like random amplification of polymorphic DNA, repetitive extragenic palindromic PCR and multilocus enzyme electrophoresis, a high bacterial diversity below the species and subspecies level (microdiversity) is revealed. It became apparent that bacteria of a certain species living in close association with different plants either as associated rhizosphere bacteria or as plant pathogens or symbiotic organisms, typically reflect this relationship in their genetic relatedness. The strain composition within a population of soil bacterial species at a given field site, which can be identified by these high resolution fingerprinting techniques, was markedly influenced by soil management and soil features. The observed bacterial microdiversity reflected the conditions of the habitat, which select for better adapted forms. In addition, influences of spatial separation on specific groupings of bacteria were found, which argue for the occurrence of isolated microevolution. In this review, examples are presented of bacterial microdiversity as influenced by different ecological factors, with the main emphasis on bacteria from the natural environment. In addition, information available from some of the first complete genome sequences of bacteria (Helicobacter pylori and Escherichia coli) was used to highlight possible mechanisms of molecular evolution through which mutations are created; these include mutator enzymes. Definitions of bacterial species and subspecies ranks are discussed in the light of detailed information from whole genome typing approaches.

Keywords: Microdiversity; Microbial ecology; Microbial evolution; Whole genome analysis; Burkolderia; Paenibacillus; Ochrobactrum; Pseudomonas; Frankia; Rhizobium; Helicobacter; Escherichia coli; Stenotrophomonas; Xanthomonas; Ralstonia

Journal Article.  10237 words. 

Subjects: Medical Microbiology and Virology ; Biotechnology ; Genetics and Genomics ; Microbiology ; Molecular and Cell Biology

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