Siderophore cooperation of the bacterium Pseudomonas fluorescens in soil

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Abstract

While social interactions play an important role for the evolution of bacterial siderophore production in vitro, the extent to which siderophore production is a social trait in natural populations is less clear. Here, we demonstrate that siderophores act as public goods in a natural physical environment of Pseudomonas fluorescens: soil-based compost. We show that monocultures of siderophore producers grow better than non-producers in soil, but nonproducers can exploit others' siderophores, as shown by non-producers' ability to invade populations of producers when rare. Despite this rare advantage, non-producers were unable to outcompete producers, suggesting that producers and non-producers may stably coexist in soil. Such coexistence is predicted to arise from the spatial structure associated with soil, and this is supported by increased fitness of non-producers when grown in a shaken soil-water mix. Our results suggest that both producers and non-producers should be observed in soil, as has been observed in marine environments and in clinical populations.

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CITATION STYLE

APA

Luján, A. M., Gómez, P., & Buckling, A. (2015). Siderophore cooperation of the bacterium Pseudomonas fluorescens in soil. Biology Letters, 11(2). https://doi.org/10.1098/rsbl.2014.0934

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