دورية أكاديمية
أعرض في EDS

Microbial preference for chlorate over perchlorate under simulated shallow subsurface Mars-like conditions.

التفاصيل البيبلوغرافية
العنوان: Microbial preference for chlorate over perchlorate under simulated shallow subsurface Mars-like conditions.
المؤلفون: Fischer FC; Center for Astronomy and Astrophysics, RG Astrobiology, Technische Universität Berlin, Berlin, Germany., Schulze-Makuch D; Center for Astronomy and Astrophysics, RG Astrobiology, Technische Universität Berlin, Berlin, Germany.; GFZ German Research Center for Geosciences, Section Geomicrobiology, Potsdam, Germany.; Department of Plankton and Microbial Ecology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Stechlin, Germany., Heinz J; Center for Astronomy and Astrophysics, RG Astrobiology, Technische Universität Berlin, Berlin, Germany. heinz@tu-berlin.de.
المصدر: Scientific reports [Sci Rep] 2024 May 21; Vol. 14 (1), pp. 11537. Date of Electronic Publication: 2024 May 21.
نوع المنشور: Journal Article
اللغة: English
بيانات الدورية: Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE
أسماء مطبوعة: Original Publication: London : Nature Publishing Group, copyright 2011-
مواضيع طبية MeSH: Perchlorates*/metabolism , Mars* , Chlorates*/metabolism , Extraterrestrial Environment*, Aspergillus niger/metabolism ; Saccharomycetales/metabolism ; Water/chemistry ; Microbial Viability
مستخلص: The Martian surface and shallow subsurface lacks stable liquid water, yet hygroscopic salts in the regolith may enable the transient formation of liquid brines. This study investigated the combined impact of water scarcity, UV exposure, and regolith depth on microbial survival under Mars-like environmental conditions. Both vegetative cells of Debaryomyces hansenii and Planococcus halocryophilus, alongside with spores of Aspergillus niger, were exposed to an experimental chamber simulating Martian environmental conditions (constant temperatures of about - 11 °C, low pressure of approximately 6 mbar, a CO 2 atmosphere, and 2 h of daily UV irradiation). We evaluated colony-forming units (CFU) and water content at three different regolith depths before and after exposure periods of 3 and 7 days, respectively. Each organism was tested under three conditions: one without the addition of salts to the regolith, one containing sodium chlorate, and one with sodium perchlorate. Our results reveal that the residual water content after the exposure experiments increased with regolith depth, along with the organism survival rates in chlorate-containing and salt-free samples. The survival rates of the three organisms in perchlorate-containing regolith were consistently lower for all organisms and depths compared to chlorate, with the most significant difference being observed at a depth of 10-12 cm, which corresponds to the depth with the highest residual water content. The postulated reason for this is an increase in the salt concentration at this depth due to the freezing of water, showing that for these organisms, perchlorate brines are more toxic than chlorate brines under the experimental conditions. This underscores the significance of chlorate salts when considering the habitability of Martian environments.
(© 2024. The Author(s).)
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معلومات مُعتمدة: 455070607 Deutsche Forschungsgemeinschaft
المشرفين على المادة: 0 (perchlorate)
تواريخ الأحداث: Date Created: 20240521 Date Completed: 20240522 Latest Revision: 20240524
رمز التحديث: 20240524
مُعرف محوري في PubMed: PMC11109124
DOI: 10.1038/s41598-024-62346-y
PMID: 38773211
قاعدة البيانات: MEDLINE
الوصف
تدمد:2045-2322
DOI:10.1038/s41598-024-62346-y