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Compara resistance of subsurface Tessarococcus isolates from the Iberian Pyrite Belt to simulated Martian conditions

Malki, M. and Leandro, T. and Amils, R. and Marteinsson, V. and Cockell, C. (Coordinator) and Beblo-Vranesevic, Kristina and Bohmeier, M. and Rettberg, Petra and Schwendner, P. and Perras, A. and Moissl-Eichinger, C. and Gaboyer, F. and Westall, F. and Walter, N. and Garcia-Descalzo, L. and Gomez, F. and Monaghan, E. and Ehrenfreund, P. and Vannier, P. (2017) Compara resistance of subsurface Tessarococcus isolates from the Iberian Pyrite Belt to simulated Martian conditions. EANA 2017, 14.-17. August, 2017, Aarhus, Denmark.

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Abstract

During the development of the Mars Analogues for Space Exploration project (MASE) several microbial isolates of the Tessaracoccus genus, a denitrifying actynomicetes, were obtained from enrichment cultures of samples from cores drilled at different depths in the Iberian Pyrite Belt. Some of these strains, isolates SSRT5 and SSRT8, were subjected to Mars environmental stress tests under controlled laboratory conditions; e.g. high salt concentra- tions, temperature, oxidizing compounds, radiation and low water activity. All sampling, isolation, and cultivation steps, as well as the stress tests were performed under strict anoxic conditions. The differences found between these isolates are remarkable. Isolate SSRT8 was able to grow efficiently at low temperature (4 oC). It was able to grow in the presence of 300 mM Ca, Mg and Na perchlorates and to resist up to 1M concentration of these salts. The sensitivity of isolate SSRT5 was dependent on the cation of the perchlorate. Isolate SSRT8 was more resistant to extended exposures to low temperatures (-80 oC) and exposure to 500Gy X-Ray radiation. Both isolates are extremely sensitive to freeze and thaw cycles, desiccation and starvation. Genomic comparison of both isolates is currently underway to detect the een two isolates from the same ecosystem.

Item URL in elib:https://elib.dlr.de/114419/
Document Type:Conference or Workshop Item (Speech)
Title:Compara resistance of subsurface Tessarococcus isolates from the Iberian Pyrite Belt to simulated Martian conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Malki, M.Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid, Spain.UNSPECIFIED
Leandro, T.Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid, Spain.UNSPECIFIED
Amils, R.Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid, Spain.UNSPECIFIED
Marteinsson, V.(is) - MASE teamUNSPECIFIED
Cockell, C. (Coordinator)uk centre for astrobiology, school of physics and astronomy, university of edinburgh, edinburgh, uk; e-mail: c.s.cockell (at) ed.ac.uk - MASE teamUNSPECIFIED
Beblo-Vranesevic, Kristinaradiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germany - MASE teamhttps://orcid.org/0000-0002-4834-7121
Bohmeier, M.radiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germany - MASE teamUNSPECIFIED
Rettberg, Petraradiation biology department, institute of aerospace medicine, german aerospace center (dlr), cologne, germany. MASE teamhttps://orcid.org/0000-0003-4439-2395
Schwendner, P.uk center for astrobiology, school of physics and astronomy, university of edinburgh, edinburgh, uk - MASE teamUNSPECIFIED
Perras, A.(a) - MASE teamUNSPECIFIED
Moissl-Eichinger, C.(a) - MASE teamUNSPECIFIED
Gaboyer, F.(f) - MASE teamUNSPECIFIED
Westall, F.(f) - MASE teamUNSPECIFIED
Walter, N.(f) - MASE teamUNSPECIFIED
Garcia-Descalzo, L.(es) - MASE teamUNSPECIFIED
Gomez, F.(es) - MASE teamUNSPECIFIED
Monaghan, E.(nl) - MASE teamUNSPECIFIED
Ehrenfreund, P.(nl) - MASE teamUNSPECIFIED
Vannier, P.(is) - MASE teamUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:MASE (Mars Analogues for Space Exploration)
Event Title:EANA 2017
Event Location:Aarhus, Denmark
Event Type:international Conference
Event Dates:14.-17. August, 2017
Organizer:European Astrobiology Network Association
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:28 Sep 2017 11:45
Last Modified:31 Jul 2019 20:11

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