Utilization of heterologous siderophores enhances levels of iron available to Pseudomanas putida in the rhizosphere

Article Abstract:

A study has been carried out to determine whether levels of iron available to Pseudomonas putida are changed by siderophores coming from microbial coinhabitants in the rhizosphere. The study shows P. putida expresses genes for proverdine production and uptake in the rhizosphere. The level of gene expression depends somewhat on other bacteria in the habitat. Diverse microorganism groups alter availability of chemical resources in microbial habitats on root surfaces. Ability to use heterologous siderophores coming from other members of the microflora is proposed as a fitness factor that would give selective advantage to Pseudomonas spp.

United States, Statistical Data Included, Physiological aspects, Environmental aspects, Pseudomonas putida, Cytochemistry, Iron, Iron (Metal), Rhizosphere

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Characterization of a genomic region required for production of the antibiotic pyoluteorin by the biological control agent Pseudomonas fluorescens Pf-5

Article Abstract:

Experimental studies involving inactivation of pyoluteorin production (Plt-) by Tn5 insertions reveal that biosynthesis of the aromatic polyketide antibiotic pyoluteorin by Pseudomonas fluorescens Pf-5 requires a genomic DNA spanning 21 kb. Analysis of the expression of plt genes by the biological control bacterium Pf-5 reveals the in situ expression of the genes necessary for pyoluteorin production by Pf-5.

Genetic aspects, Microbiological synthesis, Physiological regulation, Biological control systems, Pseudomonas fluorescens

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