Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 18, Issue 2, Pages 656-667Publisher
WILEY
DOI: 10.1111/1462-2920.13063
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Funding
- University of Delaware Department of Civil and Environmental Engineering
- Danish National Research Foundation
- Gottfried Wilhelm Leibniz Program of the Deutsche Forschungsgemeinschaft [HI 616 14-1]
- Office of Integrative Activities
- Office Of The Director [1301765] Funding Source: National Science Foundation
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Heterotrophic Proteobacteria and Actinobacteria were isolated from Lake Matano, Indonesia, a stratified, ferruginous (iron-rich), ultra-oligotrophic lake with phosphate concentrations below 50nM. Here, we describe the growth of eight strains of heterotrophic bacteria on a variety of soluble and insoluble sources of phosphorus. When transferred to medium without added phosphorus (P), the isolates grow slowly, their RNA content falls to as low as 1% of cellular dry weight, and 86-100% of the membrane lipids are replaced with amino- or glycolipids. Similar changes in lipid composition have been observed in marine photoautotrophs and soil heterotrophs, and similar flexibility in phosphorus sources has been demonstrated in marine and soil-dwelling heterotrophs. Our results demonstrate that heterotrophs isolated from this unusual environment alter their macromolecular composition, which allows the organisms to grow efficiently even in their extremely phosphorus-limited environment.
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