干旱区生态环境知识资源中心(Arid): Phospholipid biomarkers in Mars-analogous soils of the Atacama Desert

Arid

DOI	10.1017/S1473550420000294
	Phospholipid biomarkers in Mars-analogous soils of the Atacama Desert
	Shen, Jianxun
通讯作者	Shen, JX (corresponding author), Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland. ; Shen, JX (corresponding author), Univ St Andrews, Ctr Exoplanet Sci, St Andrews KY16 9AL, Fife, Scotland.
来源期刊	INTERNATIONAL JOURNAL OF ASTROBIOLOGY
ISSN	1473-5504
EISSN	1475-3006
出版年	2020
卷号	19 期号:6 页码:505-514
英文摘要	In Mars-analogous hyperarid soils of the Atacama Desert, phospholipid fatty acids (PLFAs) as the main component of biomembrane play a role in reliably determining viable microbes. PLFA analyses illustrated a rise of the microbial abundance (from 5.0 x 10(6) to 4.2 x 10(7) cells g(-1)) and biodiversity (from 7 to 15 different individual PLFAs) from the north hyperarid core of the Atacama Desert to the southern arid region. Abundant cyclopropyl PLFAs (47.2 +/- 4.6%) suggested the resistance to oligotrophic and hypersaline environments by Atacama microbial communities. The southernmost arid site had the highest proportion (8.7%) of eukaryotic and fungal lipid biomarkers. Different precipitations (ranging from 0.7 to 2 mm year(-1)) in the hyperarid core exerted different effects on microbial biomass, PLFA diversity, bacteria and microeukaryotes. By principal component analysis (cumulative 74.6% of variance), the dominance of PLFA hydroxylation was associated with the microbial viability; bacteria rich in C16:0, C18:0 and C16:1.9 favoured higher soil conductivity and nitrate; and other PLFAs contributed more to the organic content. Additionally by comparing the ratios of PLFAs to well-preserved organics (e.g., mineral-bound organic carbon and microbial phosphorus), I found that the degradation of PLFAs decreased to a minimum when the mean annual precipitation is lower than 2 mm. These findings may further specify identifiable biomarkers on Mars, if potentially extant Martian microbes possess comparable phospholipid membrane structure.
英文关键词	Biomass degradation GC-MS lipid PLFA starvation viable
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000619170500012
WOS类目	Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS研究方向	Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/348926
作者单位	[Shen, Jianxun] Univ St Andrews, Sch Earth & Environm Sci, St Andrews KY16 9AL, Fife, Scotland; [Shen, Jianxun] Univ St Andrews, Ctr Exoplanet Sci, St Andrews KY16 9AL, Fife, Scotland
推荐引用方式 GB/T 7714	Shen, Jianxun. Phospholipid biomarkers in Mars-analogous soils of the Atacama Desert[J],2020,19(6):505-514.
APA	Shen, Jianxun.(2020).Phospholipid biomarkers in Mars-analogous soils of the Atacama Desert.INTERNATIONAL JOURNAL OF ASTROBIOLOGY,19(6),505-514.
MLA	Shen, Jianxun."Phospholipid biomarkers in Mars-analogous soils of the Atacama Desert".INTERNATIONAL JOURNAL OF ASTROBIOLOGY 19.6(2020):505-514.

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