Ecology of Arthrobacter JG-9-detectable hydroxamate siderophores in soils |
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| Institution: | 1. Professor, University of Buenos Aires, Faculty of Agronomy, Department of Animal Production, Buenos Aires, Argentina;2. Professor, CONICET-University of Buenos Aires, Institute of Physiological and Ecological Research Related to Agriculture, Buenos Aires, Argentina;1. Range Cattle Research and Education Center, University of Florida, 3401 Experiment Station, Ona 33865;2. Statistics Department, Federal University of Espírito Santo, Alegre, ES, Brazil 29075-910;3. Agronomy Department, University of Florida, Gainesville 32611;4. Embrapa, Palmas, TO, 77008-900, Brazil;5. Animal and Veterinary Sciences Department, Clemson University, Blackville, SC 29817;6. Agronomy Department, University of Florida, Gainesville 32611;7. North Florida Research and Education Center, University of Florida, 3925 Highway 71, Marianna 32446 |
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| Abstract: | Arthrobacter JG-9-detectable hydroxamate siderophores were monitored in a series of soils subjected to different treatments in the laboratory and in a series of field soils subjected to different regimes. Concentrations of soil siderophores were found to be strongly related to the quantity of organic substrates available for microbial growth in the soil. It was possible to specifically stimulate siderophore production using L-ornithine as a precursor. Soil pH, water activity and iron availability also influenced the production of siderophores in soil. For two series of field samples, siderophores concentration in soil was correlated with grass production. A model is proposed in which the rhizosphere constitutes the most important microsite in soil for siderophore production. Siderophores are thereby conceived as vehicles for iron, increasing the mass flow of iron from the soil-humus complex to the growing microbial, particularly fungal, biomass. |
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