NDLI: Perchlorate and halophilic prokaryotes: implications for possible halophilic life on Mars

Content Provider	Springer Nature Link
Author	Oren, Aharon Elevi Bardavid, Rahel Mana, Lily
Copyright Year	2013
Abstract	In view of the finding of perchlorate among the salts detected by the Phoenix Lander on Mars, we investigated the relationships of halophilic heterotrophic microorganisms (archaea of the family Halobacteriaceae and the bacterium Halomonas elongata) toward perchlorate. All strains tested grew well in NaCl-based media containing 0.4 M perchlorate, but at the highest perchlorate concentrations, tested cells were swollen or distorted. Some species (Haloferax mediterranei, Haloferax denitrificans, Haloferax gibbonsii, Haloarcula marismortui, Haloarcula vallismortis) could use perchlorate as an electron acceptor for anaerobic growth. Although perchlorate is highly oxidizing, its presence at a concentration of 0.2 M for up to 2 weeks did not negatively affect the ability of a yeast extract-based medium to support growth of the archaeon Halobacterium salinarum. These findings show that presence of perchlorate among the salts on Mars does not preclude the possibility of halophilic life. If indeed the liquid brines that may exist on Mars are inhabited by salt-requiring or salt-tolerant microorganisms similar to the halophiles on Earth, presence of perchlorate may even be stimulatory when it can serve as an electron acceptor for respiratory activity in the anaerobic Martian environment.
Starting Page	75
Ending Page	80
Page Count	6
File Format	PDF
ISSN	14310651
Journal	Extremophiles
Volume Number	18
Issue Number	1
e-ISSN	14334909
Language	English
Publisher	Springer Japan
Publisher Date	2013-10-23
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Perchlorate Halophilic archaea Haloferax Haloarcula Anaerobic respiration Mars Microbiology Biotechnology Biochemistry Microbial Ecology
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Medicine Microbiology

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