与阿塔卡马沙漠的邻近土壤相比,El Médano 464石上的微生物生物质积累更高
Gabriel A Pinto1,2,3,4, María Ángeles Lezcano5,6, Laura Sanchéz-García5
1Institute of Natural Sciences, Geological Survey of Belgium, Brussels, Belgium.
Astrobiology
|February 19, 2025
概括
在El Médano 464石中的有机化合物和DNA表明了陆地污染. 虽然体石可以容纳微生物,但这项研究发现EM 464中的大多数有机分子可能来自地球,而不是外星起源.
科学领域:
- 天体生物学 天体生物学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 体石是微生物殖民的潜在基质.
- 从陆地污染区分内在石有机化合物仍然是一个挑战.
研究的目的:
- 为了研究El Médano 464 (EM 464) CO碳酸中脂质和DNA的分子分布和碳同位素组成.
- 通过将其与周围的阿塔卡马沙漠土壤样本进行比较,评估石中的有机化合物和微生物存在的来源.
主要方法:
- 分析EM 464中的碳化合物,酸和酒精以及控制土壤样本.
- 提取有机化合物的碳同位素组成 (δ13C) 分析.
- 从石和土壤样本中提取和测序DNA (细菌16S rRNA基因).
主要成果:
- 与土壤样本相比,EM 464中分析的脂类家族的丰度更高.
- 在EM 464中有机化合物的C值被耗尽,与陆地生物特征 (卡尔文周期) 一致.
- 在石和土壤中,DNA分析揭示了占主导地位的细菌类 (Proteobacteria/Pseudomonadota,Actinobacteriota),但在石中具有不同的家族级组成和更高的多样性.
结论:
- 有机化合物的分布和同位素值,以及DNA分析,强烈表明EM 464 CO地铁体中检测到的有机化合物主要是陆地起源 (污染).
- 在石中发现的多样化的微生物群体表明,阿塔卡马地铁可以为陆地微生物提供独特的生态.
- 这表明,在研究在陆地环境中发现的石中的有机分子时,污染是需要考虑的重要因素.
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