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Related Experiment Videos

Evolutionary relationships among sulfur- and iron-oxidizing eubacteria.

D J Lane1, A P Harrison, D Stahl

  • 1Department of Biology, Indiana University, Bloomington 47405.

Journal of Bacteriology
|January 11, 1992
PubMed
Summary

This study analyzed 16S rRNA sequences from sulfur- and iron-oxidizing bacteria, revealing diverse evolutionary affiliations. Many belong to Proteobacteria, but some novel iron-oxidizers link to gram-positive bacteria, highlighting widespread oxidation capabilities.

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Environmental Science

Background:

  • Sulfur- and iron-oxidizing bacteria play crucial roles in biogeochemical cycles.
  • Understanding their diversity and evolutionary history is key to microbial ecology.
  • Previous studies have identified various groups, but a comprehensive evolutionary picture was lacking.

Purpose of the Study:

  • To determine the phylogenetic diversity of sulfur- and/or iron-oxidizing eubacteria.
  • To investigate the evolutionary relationships of these bacteria using 16S rRNA gene sequences.
  • To explore the evolutionary origins of microbial iron and sulfur oxidation.

Main Methods:

  • Determination of partial 16S rRNA gene sequences.
  • Phylogenetic analysis of obtained sequences.

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  • Comparison with known bacterial 16S rRNA gene databases.

    • Main Results:

    • Sequencing of 37 partial 16S rRNA genes from diverse sulfur- and/or iron-oxidizing eubacteria.
    • Majority of sequences affiliated with Proteobacteria, including genera like Thiobacillus and Chlorobium.
    • Novel affiliations observed for some isolates, including gram-positive and potentially new Proteobacteria subdivisions, with some showing no clear phylum-level links.

    Conclusions:

    • Sulfur and iron oxidation are evolutionarily widespread capabilities among eubacteria.
    • Phylogenetic analysis reveals diverse evolutionary trajectories for these metabolic traits.
    • Further research is needed to fully resolve the evolutionary placement of certain iron-oxidizing bacterial groups.