These data demonstrate that thermophiles, especially H. marinus is highly influenced by a pre-treatment with different perchlorates additive effects of desiccation and perchlorate treatments are visible in a reduced survival rate. Furthermore, it was shown that the known desiccation tolerance of H. marinus showed significant changes in cell morphology from single motile short rods to long cell chains up to 80 cells. After the addition of up to 440 mM ( 3.7%) sodium perchlorate, H. marinus was able to tolerate concentrations of sodium perchlorate up to 200 mM ( 1.6%) during cultivation without any changes in its growth pattern. Therefore, the ability of Hydrogenothermus marinus, a desiccation tolerant bacterium, to survive and grow in the presence of perchlorates was determined. On Mars, significant amounts (0.4–0.6%) of perchlorate ions were detected in dry soil by the Phoenix Wet Chemistry Laboratory and later confirmed with the Mars Science Laboratory. 2Institute for Microbiology and Archaea Center, Faculty of Biology and Preclinical Medicine, University of Regensburg, Regensburg, Germany.1Radiation Biology Division, Institute of Aerospace Medicine, German Aerospace Center (DLR e.V.), Cologne, Germany.Kristina Beblo-Vranesevic 1*, Harald Huber 2 and Petra Rettberg 1
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