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Fungistatic activity of water soluble fluorescent pigments of fluorescent pseudomonads



Fungistatic activity of water soluble fluorescent pigments of fluorescent pseudomonads



Phytopathology 72(1): 33-36



Water-soluble fluorescent pigments of 156 fluorescent Pseudomonas isolates of plant pathogenic and saprophytic species inhibited the growth of Geotrichum candidum. Other fungal species that showed sensitivity to the pigments produced by 4 Pseudomonas isolates were Rhizoctonia solani, Sclerotinia sclerotiorum, Phymatotrichum omnivorum, Phytophthora megasperma and Pythium aphanidermatum. A direct correlation was established between the quantity of a partially purified pigment obtained from an isolate of Pseudomonas fluorescens and its fungistatic activity against Pythium aphanidermatum. The inhibition could be counteracted by adding Fe to the medium in excess of chelating capacity of the added pigment. Fungistatic activity of the pigment is due to its ability to remove Fe from the medium by forming an Fe-pigment complex. The pigment exhibited properties similar to those of known microbial Fe-chelating substances (siderophores).

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Accession: 005495550

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