Abstract
A study about the effect of iron concentration and the presence of different organic nitrogen sources on fluorescent pigment production by Pseudomonas reptilivora and Pseudomonas fluorescens has been investigated. An inverse proportionality between pigment formation and iron concentration for both species has been deduced. However, P. reptilivora responds to increasing iron concentrations more sensitive than P. fluorescens, i.e. it forms at equal iron concentration less pigment. P. reptilivora needs iron even for growth contrary to P. fluorescens. The differences in pigment production on different peptones are due to the iron contained in these media.
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