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Rettberg, Petra and Antunes, André and Beblo-Vranesevic, Kristina (2022) SALINISPHAERA SHABANENSIS - A NEW ASTROBIOLOGICAL MODEL ORGANISM. 73rd International Astronautical Congress 2022, 18 – 22 September 2022, Paris, France.

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In our solar system Mars and Enceladus are the most promising targets for a search for evidence of life. The subsurface of Mars and the subsurface oceans of Enceladus might be habitable. The general environmental conditions of both are quite different, but both have in common the presence of water, low average temperatures, the availability of carbon in form of CO₂ or organic compounds, and the presence of salts. Assessing the habitability of Mars and detecting life, if it was ever there, depends on knowledge of whether the combined environmental stresses experienced on Mars are compatible with life and whether records of that life could be detected. Our current ability to make these assessments is hampered by a lack of knowledge of how the combined effect of different environmental stresses influence the survival and growth of organisms. In particular, many combinations of stress, such as high radiation conditions combined with an absence of water as it is the case in the shallow subsurface of Mars have not been investigated. Furthermore, a lack of experimental studies on how anaerobic microorganisms, from extreme terrestrial environments, respond to such stresses undermine our knowledge of Mars as a location for life since the planet is essentially anoxic. We tested the response of a variety of (facultative) anaerobic microorganisms to conditions on current day or on early Mars. Strain selection and first resistance tests are in process with bacteria from a variety of groups, among them the moderately halophilic Salinisphaera shabanensis, previously isolated from a deep-sea brine. This bacterium is facultative anaerobic, radiation tolerant and can survive long periods of desiccation making it a promising new model organism for astrobiology.

Item URL in elib:https://elib.dlr.de/189255/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper ID: 68198
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rettberg, PetraRadiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany; Petra.Rettberg (at) dlr.dehttps://orcid.org/0000-0003-4439-2395
Antunes, AndréState Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology (MUST), China; aglantunes (at) must.edu.moUNSPECIFIED
Beblo-Vranesevic, KristinaRadiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany; kristina.beblo (at) dlr.dehttps://orcid.org/0000-0002-4834-7121
Date:September 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Astrobiology, strain selection, Salinisphaera shabanensis
Event Title:73rd International Astronautical Congress 2022
Event Location:Paris, France
Event Type:international Conference
Event Dates:18 – 22 September 2022
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Project ISS LIFE 2.0
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:10 Nov 2022 12:20
Last Modified:22 Nov 2022 14:23

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