Table 1: Some violacein-producing strains and the locales from which they were isolated.

StrainLocaleReference

Chromobacterium  violaceum River 
Waste water treatment plant
[14] 
[21]
Collimonas sp.Arctic coastal waters[1]
Duganella sp.Agricultural soils (olive)[10]
D. violaceinigra Forest soils[22]
Janthinobacterium  lividum Glacier[4]
J. svalbardensis Glacier[11]
Pseudoalteromonas sp.Deep sea waters (320 m)[23]
P. luteoviolacea Sea sponge surface[7]