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Pseudomonas congelans

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A gram negative motile non-spore forming and rod-shaped flourescent bacterium involved as a plant pathogens.


Pseudomonas congelans has a size of about 2.5-2.9 micrometer wide and 0.8 micrometer long. It is aerobic bacterium that grows best at 21’C. In cultured medium shows smooth white-yellowish color with regular margins and produces a pigment which is light yellow-green flourescent coloration under ultraviolet light.

Pseudomonas congelans is commonly isolated from phyllosphere of grasses and presents in ice nucleation activity. It is negative in starch hydrolysis, arginine dihydrolase, indole production, sodium thiosulphate and oxidase while it is positive in casein hydrolysis, gelatinase, monomethyl succinate and catalase.

Pseudomonas congelans has been known to be mainly saprophytic flourescent pseudomonads that can be identified easily through its phenotypic characteristics and negative arginine dihydrolase reaction thus, signify as a potential for plant pathogens.

Scientific Classification:

 Kingdom: Bacteria
 Phylum: Proteobacteria
 Class: Gamma Proteobacteria
 Order: Pseudomonadales
 Family: Pseudomonadaceae
 Genus: Pseudomonas
 Species: Pseudomonas congelans

See also:

• Bacteria

• Pseudomonas