Pseudomonas aeruginosa
Pseudomonas aeruginosa
Pseudomonas aeruginosa is a common Gram-negative, rod-shaped bacterium found globally in soil and water environments. It is characterized by its remarkable metabolic versatility and the production of distinct pigments such as pyocyanin. As an opportunistic pathogen, it causes infections in immunocompromised individuals and is a significant hospital-acquired pathogen. It is well-known for its high intrinsic resistance to multiple antibiotics and its ability to form resilient biofilms.
Details
Identification
Gram-negative, rod-shaped, monotrichous flagella, production of blue-green (pyocyanin) and yellow-green (pyoverdin) pigments, sweet fruity odor resembling linden blossoms or jasmine.
Social behavior
Communicates via quorum sensing to coordinate gene expression and form complex, protective biofilms within colonies.
Diet
Chemoorganotrophic generalist; utilizes a wide variety of organic compounds, including hydrocarbons, as energy sources; capable of nitrate respiration under anoxic conditions.
Overwintering
Persistence in soil or water; high survival capability under adverse conditions.
Ecology
Ecological role
Important decomposer of organic matter; plays a role in the nitrogen cycle (denitrification) and in the degradation of pollutants (bioremediation).
Natural predators
Bacteriophages, protozoa (e.g., amoebae), and predatory bacteria such as Bdellovibrio.
Competitor species
Other environmental bacteria such as species of the genera Bacillus or Staphylococcus.
Ecosystem service
Degradation of complex hydrocarbons and xenobiotics in contaminated ecosystems.
Scientific profile
Profile
Habitat
Ubiquitous in the environment; found in soil, surface waters (freshwater), sewage, marine habitats, and moist anthropogenic niches (hospitals, showers, cooling systems).
Ecological role
Important decomposer and player in the nitrogen cycle through denitrification (reduction of nitrate to molecular nitrogen). Also significant for bioremediation in the degradation of hydrocarbons (e.g., crude oil).