从暴露于地球近太空的火星模拟凯达姆盆地土壤中分离出的耐高氯酸盐细菌菌株。

IF 4.5 Q1 MICROBIOLOGY mLife Pub Date : 2024-09-16 eCollection Date: 2024-09-01 DOI:10.1002/mlf2.12142
Li Liu, Mengling Kang, Zhe Wang, Jianxun Shen, Yongxin Pan, Wei Lin
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引用次数: 0

摘要

地球的近太空海拔较低,为20-40千米,具有多种极端条件,是进行天体生物学研究的一个独特的火星类似物,可用于研究地球生命的极限和火星探测的行星保护考虑因素。在这项研究中,我们将类似火星的沙漠碎屑暴露在浮空高度约为 35 千米的近太空中,并在暴露后分离出四种细菌菌株。除了对极端环境压力的耐受性之外,这些菌株还对当今火星土壤中广泛存在的高氯酸盐具有显著的耐受性。通过近太空暴露筛选出的这些嗜极细菌菌株可作为未来在空间站或实验室行星模拟环境中进行天体生物学研究的理想候选菌株。
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Perchlorate-tolerant bacterial strains isolated from the Mars-analog Qaidam Basin soils exposed to Earth's near space.

Earth's lower near space of 20-40 km above sea level with polyextreme conditions serves as a unique Mars analog for astrobiological research to investigate the limits of life on Earth and planetary protection considerations for Mars exploration. In this study, we exposed Mars-like desert regolith to near space at a float altitude of ~35 km and isolated four bacterial strains after exposure. In addition to stress tolerance to extreme environmental stressors, these strains represent a remarkable tolerance to perchlorate that is widespread in present-day Martian soils. These extremophilic bacterial strains screened through near-space exposure could serve as promising candidates for future astrobiological research in space stations or in laboratory-based planetary simulation environments.

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