Liu Li, Kang Mengling, Wang Zhe, Shen Jianxun, Pan Yongxin, Lin Wei
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China.
College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China.
mLife. 2024 Sep 16;3(3):471-475. doi: 10.1002/mlf2.12142. eCollection 2024 Sep.
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.
地球海平面以上20 - 40公里的低空近空间具有多种极端条件，是进行天体生物学研究的独特火星模拟环境，可用于探究地球生命的极限以及火星探测中的行星保护考量。在本研究中，我们将类似火星的沙漠风化层置于约35公里的浮空高度暴露于近空间，暴露后分离出了四种细菌菌株。除了对极端环境压力源具有耐受性外，这些菌株对当今火星土壤中广泛存在的高氯酸盐也表现出显著的耐受性。通过近空间暴露筛选出的这些极端嗜热细菌菌株，有望成为未来空间站或基于实验室的行星模拟环境中天体生物学研究的候选对象。
