Characteristics
Members of the genus display the following defining characteristics:
- Rod shaped
- Gram-negative
- One or more polar flagella, providing motility
- Aerobic
- Non–spore forming
- positive catalase test
- positive oxidase test.
Other characteristics which tend to be associated with Pseudomonas species (with some exceptions) include secretion of pyoverdine, a fluorescent yellow-green siderophore under iron-limiting conditions. Certain Pseudomonas species may also produce additional types of siderophore, such as pyocyanin by Pseudomonas aeruginosa and thioquinolobactin by Pseudomonas fluorescens,. Pseudomonas species also typically give a positive result to the oxidase test, the absence of gas formation from glucose, glucose is oxidised in oxidation/fermentation test using Hugh and Leifson O/F test, beta hemolytic (on blood agar), indole negative, methyl red negative, Voges–Proskauer test negative, and citrate positive.
Read more about this topic: Pseudomonas