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Survival of desert algae Chlorella exposed to Mars-like near space environment

机译：沙漠藻类小球藻的生存暴露在近空间环境附近的火星

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摘要

Desert was considered terrestrial analogues of Mars. In this study, dried cells of desert green algae Chlorella were exposed to Mars-like near-space environment using high-altitude scientific balloons. We found that while a majority of Chlorella cells survived, they exhibited considerable damage, such as low photosynthetic activity, reduced cell growth, increased cell mortality rate, and altered chloroplast and mitochondrial ultrastructure. Additionally, transcriptome analysis of near space-exposed Chlorella cells revealed 3292 differentially expressed genes compared to cells in the control ground group, including heat shock proteins, antioxidant enzymes, DNA repair systems, as well as proteins related to the PSII apparatus and ribosomes. These data shed light on the possible survival strategy of desert algae to near space environments. Our results indicated that Mars-like near space conditions represent an extreme environment for desert algae in terms of temperature, pressure, and radiations. The survival strategy of Chlorella in response to near space will help gain insights into the possibility of extremophile colonization on the surface of Mars and in similar extraterrestrial habitats.
机译：沙漠被认为是火星的陆地类似物。在该研究中，使用高空科学气球将沙漠绿藻小球藻的干细胞暴露于火星的近空间环境。我们发现，虽然大多数小球菌细胞存活，但它们表现出相当大的损害，例如低光合活性，降低细胞生长，增加细胞死亡率和改变叶绿体和线粒体超超微结构。另外，与对照研磨基团中的细胞相比，对近空间暴露的小球藻细胞的转录物分析显示了3292个差异表达基因，包括热休克蛋白，抗氧化酶，DNA修复系统以及与PSII装置和核糖体相关的蛋白质。这些数据阐明了沙漠藻类可能的生存策略到空间环境附近。我们的结果表明，在温度，压力和辐射方面，火星近的空间条件是沙漠藻类的极端环境。小球藻的存活策略响应近空间的反应将有助于深入了解火星表面和类似的外星栖息地的极端机会殖民化的可能性。

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  • 来源
    《Life Sciences in Space Research》 |2021年第5期|22-29|共8页
  • 作者

    Wang Bo; Ye Tong; Li Xiaoyan; Bian Po; Liu Yongding; Wang Gaohong;

  • 作者单位

    Chinese Acad Sci Inst Hydrobiol Key Lab Algal Biol Wuhan 430072 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Hydrobiol Key Lab Algal Biol Wuhan 430072 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Hydrobiol Key Lab Algal Biol Wuhan 430072 Peoples R China;

    Chinese Acad Sci & Anhui Prov Hefei Inst Phys Sci Key Lab Ion Beam Bioengn Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Hydrobiol Key Lab Algal Biol Wuhan 430072 Peoples R China;

    Chinese Acad Sci Inst Hydrobiol Key Lab Algal Biol Wuhan 430072 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Near space; Desert algae; Survival strategy, Chlorella; Transcriptome; Mars;

    机译：近空间;沙漠藻类;生存策略;小球藻;转录组;火星;

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