Arid
DOI10.1089/ast.2014.1278
Isolation of Radiation-Resistant Bacteria from Mars Analog Antarctic Dry Valleys by Preselection, and the Correlation between Radiation and Desiccation Resistance
Musilova, Michaela1; Wright, Gary2; Ward, John M.3; Dartnell, Lewis R.4,5
通讯作者Musilova, Michaela
来源期刊ASTROBIOLOGY
ISSN1531-1074
EISSN1557-8070
出版年2015
卷号15期号:12页码:1076-1090
英文摘要

Extreme radiation-resistant microorganisms can survive doses of ionizing radiation far greater than are present in the natural environment. Radiation resistance is believed to be an incidental adaptation to desiccation resistance, as both hazards cause similar cellular damage. Desert soils are, therefore, promising targets to prospect for new radiation-resistant strains. This is the first study to isolate radiation-resistant microbes by using gamma-ray exposure preselection from the extreme cold desert of the Antarctic Dry Valleys (a martian surface analogue). Halomonads, identified by 16S rRNA gene sequencing, were the most numerous survivors of the highest irradiation exposures. They were studied here for the first time for both their desiccation and irradiation survival characteristics. In addition, the association between desiccation and radiation resistance has not been investigated quantitatively before for a broad diversity of microorganisms. Thus, a meta-analysis of scientific literature was conducted to gather a larger data set. A strong correlation was found between desiccation and radiation resistance, indicating that an increase in the desiccation resistance of 5 days corresponds to an increase in the room-temperature irradiation survival of 1 kGy. Irradiation at -79 degrees C (representative of average martian surface temperatures) increases the microbial radiation resistance 9-fold. Consequently, the survival of the cold-, desiccation-, and radiation-resistant organisms isolated here has implications for the potential habitability of dormant or cryopreserved life on Mars.


英文关键词Extremophiles Halomonas sp. Antarctica Mars Ionizing radiation Cosmic rays
类型Article
语种英语
国家England
收录类别SCI-E
WOS记录号WOS:000366722500005
WOS关键词SIMULATED MARTIAN CONDITIONS ; IONIZING-RADIATION ; DEINOCOCCUS-RADIODURANS ; EXPERIMENT PROTECT ; MICROBIAL DIVERSITY ; GAMMA-IRRADIATION ; STRESS TOLERANCE ; LOW-TEMPERATURE ; SOIL NEMATODES ; TOTAL OZONE
WOS类目Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS研究方向Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
来源机构University of London
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186009
作者单位1.UCL, Dept Earth Sci, London, England;
2.Cranfield Univ, Dept Engn & Appl Sci, Swindon, Wilts, England;
3.UCL, Dept Biochem Engn, London, England;
4.UCL, UCL Inst Origins, London, England;
5.UCL, Ctr Planetary Sci, UCL Birkbeck, Earth Sci, London, England
推荐引用方式
GB/T 7714
Musilova, Michaela,Wright, Gary,Ward, John M.,et al. Isolation of Radiation-Resistant Bacteria from Mars Analog Antarctic Dry Valleys by Preselection, and the Correlation between Radiation and Desiccation Resistance[J]. University of London,2015,15(12):1076-1090.
APA Musilova, Michaela,Wright, Gary,Ward, John M.,&Dartnell, Lewis R..(2015).Isolation of Radiation-Resistant Bacteria from Mars Analog Antarctic Dry Valleys by Preselection, and the Correlation between Radiation and Desiccation Resistance.ASTROBIOLOGY,15(12),1076-1090.
MLA Musilova, Michaela,et al."Isolation of Radiation-Resistant Bacteria from Mars Analog Antarctic Dry Valleys by Preselection, and the Correlation between Radiation and Desiccation Resistance".ASTROBIOLOGY 15.12(2015):1076-1090.
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