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Image #   28708E
Name:   Pseudomonas fluorescens - Gram-negative, rod prokaryote (bacterium)
Copyright:   Copyright 2009 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Pseudomonas fluorescens - Gram-negative, aerobic, rod prokaryote. Pseudomonas fluorescens encompasses a group of common pseudomonads, which are nonpathogenic saprophytes that colonize soil, water and plant surfaces. A number of strains of P. fluorescens suppress plant diseases by protecting the seeds and roots from fungal infection. This effect is the result of production of a number of secondary metabolites including antibiotics, siderophores and hydrogen cyanide. Competitive exclusion of pathogens as the result of rapid colonization of the rhizosphere may also be an important factor in disease control. P. fluorescens strains produce a soluble, greenish fluorescent pigment (yellow-green siderophores), under conditions of low iron availability. It is primarily an obligate aerobe, however some strains can utilize nitrate (NO3) as an electron acceptor in place of oxygen (O2). It is motile by means of multiple polar flagella. Genetic techniques such as conjugation, transposition, and gene replacement are well established for this soil bacterium. P. fluorescens is used in bioremediation applications due to various strains have the inherent metabolic diversity to partially or completely degrade pollutants such as styrene, TNT and polycyclic aromatic hydrocarbons.
Magnification*: x2,600
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   28708E bacteria bacterium rod rod-shaped Pseudomonas SEM food spoilage 08.01.09 Pseudomonas fluorescens extreme environment extremophile extremophiles extremophilic hydrocarbon bacterium hydrocarbon degrading bacterium polyaromatic bacterium polyaromatic hydrocarbon bacterium polyaromatic hydrocarbon degrading bacterium prokaryote bacilli bacillus aerobic enteric Gram-negative Gram negative pseudomonad rod shaped bacterium rod-shaped bacterium soil microbe soil organism soil bacterium biodegrade styrene bioremediation soil bioremediation biodegrade TNT biodegrade polycyclic aromatic hydrocarbon biodegrade polyaromatic hydrocarbon rod prokaryote saprophyte soil sapropytes soil saprophytes degrade pollutants biodegrade pollutants metabolic diversity fluorescent pigment fluorescent pigments siderophores siderophore obligate aerobe aerobe hydrogen cyanide nonpathogenic soil colonize water colonize plant colonize root colonize pseudomonads supress plant disease suppress plant diseases polar flagellum polar flagella supress fungal infection fungal infection plant infection root infection antibiotic antibiotics competitive exclusion rhizophere rhizophere colonization diease control fungal disease control fungus disease control nonpathogenic pseudomonas nonpathogenic pseudomonad nonpathogenic saprophyte fungus control

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