![]() ![]() In 2000, the complete genome sequence of a Pseudomonas species was determined more recently, the sequence of other strains has been determined, including P. This mis-annotation problem has been reported by other analyses as well. In addition, the phylogenomic analysis identified several strains that were mis-annotated to the wrong species or evolutionary group. The four wider evolutionary groups include more than one species, based on species definition by the Average Nucleotide Identity levels. putida) with a sufficient number of available proteomes. chlororaphis) and four wider phylogenetic groups ( P. In 2020, a phylogenomic analysis of 494 complete Pseudomonas genomes identified two well-defined species ( P. Other strains previously classified in the genus Pseudomonas are now classified in the genera Burkholderia and Ralstonia. As a result, the genus Pseudomonas includes strains formerly classified in the genera Chryseomonas and Flavimonas. Recently, 16S rRNA sequence analysis has redefined the taxonomy of many bacterial species. However, many strains have since been reclassified, based on more recent methodology and use of approaches involving studies of conservative macromolecules. Soon, other species matching Migula's somewhat vague original description were isolated from many natural niches and, at the time, many were assigned to the genus. ![]() The etymology of the name was not specified at the time and first appeared in the seventh edition of Bergey's Manual of Systematic Bacteriology (the main authority in bacterial nomenclature) as Greek pseudes (ψευδής) "false" and -monas (μονάς/μονάδος) "a single unit", which can mean false unit however, Migula possibly intended it as false Monas, a nanoflagellated protist (subsequently, the term "monad" was used in the early history of microbiology to denote unicellular organisms). They were initially classified at the end of the 19th century when first identified by Walter Migula. Like most bacterial genera, the pseudomonad last common ancestor lived hundreds of millions of years ago. Despite the vague description, the type species, Pseudomonas pyocyanea (basonym of Pseudomonas aeruginosa), proved the best descriptor. The latter statement was later proved incorrect and was due to refractive granules of reserve materials. The generic name Pseudomonas created for these organisms was defined in rather vague terms by Walter Migula in 18 as a genus of Gram-negative, rod-shaped, and polar- flagellated bacteria with some sporulating species. īecause of their widespread occurrence in water and plant seeds such as dicots, the pseudomonads were observed early in the history of microbiology. putida, and the plant growth-promoting P. aeruginosa in its role as an opportunistic human pathogen, the plant pathogen P. Their ease of culture in vitro and availability of an increasing number of Pseudomonas strain genome sequences has made the genus an excellent focus for scientific research the best studied species include P. The 313 members of the genus demonstrate a great deal of metabolic diversity and consequently are able to colonize a wide range of niches. Pseudomonas is a genus of Gram-negative bacteria belonging to the family Pseudomonadaceae in the class Gammaproteobacteria. Serpens Hespell 1977 (Approved Lists 1980). ![]()
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