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Terrestrial models for extraterrestrial life: methanogens and halophiles at Martian temperatures

Published online by Cambridge University Press:  08 August 2006

I.N. Reid ,
W.B. Sparks ,
S. Lubow ,
M. McGrath ,
M. Livio ,
J. Valenti ,
K.R. Sowers ,
H.D. Shukla ,
S. MacAuley  and
T. Miller
...Show all authors
I.N. Reid
Affiliation:
Maryland Astrobiology Consortium, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: [email protected]
W.B. Sparks
Affiliation:
Maryland Astrobiology Consortium, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: [email protected]
S. Lubow
Affiliation:
Maryland Astrobiology Consortium, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: [email protected]
M. McGrath
Affiliation:
Maryland Astrobiology Consortium, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: [email protected] Marshall Spaceflight Center, Huntsville, AL 35812, USA
M. Livio
Affiliation:
Maryland Astrobiology Consortium, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: [email protected]
J. Valenti
Affiliation:
Maryland Astrobiology Consortium, USA Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA e-mail: [email protected]
K.R. Sowers
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
H.D. Shukla
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
S. MacAuley
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
T. Miller
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
R. Suvanasuthi
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
R. Belas
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
A. Colman
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
F.T. Robb
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
P. DasSarma
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
J.A. Müller
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected] Department of Biology, Morgan State University, Baltimore, MD 21215, USA
J.A. Coker
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
R. Cavicchioli
Affiliation:
Maryland Astrobiology Consortium, USA School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
F. Chen
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
S. DasSarma
Affiliation:
Maryland Astrobiology Consortium, USA University of Maryland Biotechnology Institute, Center of Marine Biotechnology, Baltimore, MD 21202, USA e-mail: [email protected]
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Abstract

Cold environments are common throughout the Galaxy. We are conducting a series of experiments designed to probe the low-temperature limits for growth in selected methanogenic and halophilic Archaea. This paper presents initial results for two mesophiles, a methanogen, Methanosarcina acetivorans, and a halophile, Halobacterium sp. NRC-1, and for two Antarctic cold-adapted Archaea, a methanogen, Methanococcoides burtonii, and a halophile, Halorubrum lacusprofundi. Neither mesophile is active at temperatures below 5 °C, but both cold-adapted microorganisms show significant growth at sub-zero temperatures (−2 °C and −1 °C, respectively), extending previous low-temperature limits for both species by 4–5 °C. At low temperatures, both H. lacusprofundi and M. burtonii form multicellular aggregates, which appear to be embedded in extracellular polymeric substances. This is the first detection of this phenomenon in Antarctic species of Archaea at cold temperatures. The low-temperature limits for both psychrophilic species fall within the temperature range experienced on present-day Mars and could permit survival and growth, particularly in sub-surface environments. We also discuss the results of our experiments in the context of known exoplanet systems, several of which include planets that intersect the Habitable Zone. In most cases, those planets follow orbits with significant eccentricity, leading to substantial temperature excursions. However, a handful of the known gas giant exoplanets could potentially harbour habitable terrestrial moons.

Keywords

AstrobiologyArchaeabiofilmextrasolar planetsMarspsychrophiles
Type
Research Article
Information
International Journal of Astrobiology , Volume 5 , Issue 2 , April 2006 , pp. 89 - 97
Copyright
2006 Cambridge University Press

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