ReviewHistorical evolution and current status of the taxonomy of genus Pseudomonas
Section snippets
History of Pseudomonas taxonomy
The genus Pseudomonas was described by Migula (1894) and therefore it was part of the history of Bacteriology since the beginning of this science. Walter Emil Friedrich August Migula was a Botanist devoted to plant taxonomy, a science started more than a century before bacterial taxonomy, which began when the compound microscope reached the resolution power required for the observation of these organisms (Palleroni, 2003). He was a contemporary of Ferdinand Cohn who published a bacterial code
Current criteria in Pseudomonas taxonomy
Since its discovery the genus Pseudomonas has undergone numerous taxonomic changes not only as far as the number of species included but also as far as the criteria used for their definition and delineation. In the current edition of Bergey's Manual of Systematic Bacteriology, an exhaustive list of methods used in Pseudomonas taxonomy was included (Palleroni, 2005). These methods reveal the efforts for characterizing Pseudomonas species and include cell morphology and structure, cell wall
Future challenges in taxonomy of the genus Pseudomonas
Microbial taxonomy is currently in evolution searching new methods to find the most suitable criteria for genera and species delineation. The bacterial species definition was re-evaluated in 2002 (Stackebrandt et al., 2002), being this specially important in the case of complex genera as occurs in the genus Pseudomonas that currently contains more than 100 species (Table 2). Most of these species are saprophytic inhabitants of water and soil related environments (Table 3) and they have
Acknowledgments
The authors wish to thank I. Geldart for revising the English version of the manuscript, and two anonymous reviewers for valuable comments.
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