Which pigment is produced by the Pseudomonas fluorescens group?

Which pigment is produced by the Pseudomonas fluorescens group?

• A. Pyomelanin
• B. Pyocyanin
• C. Pyoverdin
• D. Pyorubrin

Answer: (C)

Pseudomonas fluorescens group is known for producing pyoverdin, a fluorescent pigment that also acts as a siderophore to bind iron in environments with limited iron. In culture, pyoverdin appears yellow-green and will fluoresce under ultraviolet light, which helps distinguish this group from others. Other pigments are associated with different Pseudomonas species: pyocyanin is the blue-green pigment typical of Pseudomonas aeruginosa, while pyomelanin is a brown-black pigment produced by some strains, and pyorubrin is not a hallmark pigment of this group. Because pyoverdin is the defining, fluorescing pigment linked to the Pseudomonas fluorescens group, it is the best answer.

Pseudomonas fluorescens group is known for producing pyoverdin, a fluorescent pigment that also acts as a siderophore to bind iron in environments with limited iron. In culture, pyoverdin appears yellow-green and will fluoresce under ultraviolet light, which helps distinguish this group from others. Other pigments are associated with different Pseudomonas species: pyocyanin is the blue-green pigment typical of Pseudomonas aeruginosa, while pyomelanin is a brown-black pigment produced by some strains, and pyorubrin is not a hallmark pigment of this group. Because pyoverdin is the defining, fluorescing pigment linked to the Pseudomonas fluorescens group, it is the best answer.