Species Profiles

These are Gram-negative, non-sporing non-acid fast small rods or coccobacilli (0.6-0.9µm x 1.5-3.0µm), which exhibit bipolar staining. They are motile. They are aerobic and facultatively anaerobic. They are oxidase-positive and catalase-positive. The violet pigment violacein is produced by many strains. Other related genera may be Janthinobacterium and Iodobacter.

Genera

Chromobacterium: There is currently only one species recognized within this genus; C. violaceum. It is motile with a single polar flagellum and up to four antigenically and structurally distinct lateral flagellae. It is a facultative anaerobe with a growth range from 15-40°C. Optimal growth is achieved at 30-35°C It charactistically produces violet colonies on nutrient agar. It can reduce nitrate to nitrite and carbohydrates can be fermented. It will grow on ordinary media. The GC content of the DNA is 65-68 mol%.

Species Profiles

C. violaceum

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