Reduction of the temperature sensitivity of Halomonas hydrothermalis by iron starvation combined with microaerobic conditions 

Jesse P Harrison, John E. Hallsworth, Charles S. Cockell

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The limits to biological processes on Earth are determined by physicochemical parameters, such as extremes of temperature and low water availability. Research into microbial extremophiles has enhanced our understanding of the biophysical boundaries which define the biosphere. However, there remains a paucity of information on the degree to which rates of microbial multiplication within extreme environments are determined by the availability of specific chemical elements. Here, we show that iron availability and composition of the gaseous phase (aerobic vs. microaerobic) determine susceptibility of a marine bacterium, Halomonas hydrothermalis, to sub-optimal and elevated temperature and salinity by impacting rates of cell division (but not viability). In particular, iron starvation combined with microaerobic conditions (5 % v/v of O2, 10 % v/v of CO2, reduced pH) reduced sensitivity to temperature across the 13 °C range tested. These data demonstrate that nutrient limitation interacts with physicochemical parameters to determine biological permissiveness for extreme environments. The interplay between resource availability and stress tolerance, therefore, may shape the distribution and ecology of microorganisms within Earth's biosphere.

Original languageEnglish
Pages (from-to)2156-2162
Number of pages7
JournalApplied and Environmental Microbiology
Issue number6
Early online date16 Jan 2015
Publication statusPublished - Mar 2015

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