2,4-Diacetylphloroglucinol

2,4-Diacetylphloroglucinol or Phl is a natural phenol found in several bacteria:

• Specific strains of the Gram-negative bacterium Pseudomonas fluorescens. This compound is found to be responsible for the antiphytopathogenic and biocontrol properties in these strains.
• It is also found in Pseudomonas protegens, where it has the same activity against various plant pathogens.
• Lysobacter gummosus, a bacterium which lives on the skin of red-backed salamanders.
• Isolates of Pseudomonas aurantiaca found in Ukraine, living in root symbiosis produce it to control Fusarium oxysporum.

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