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首页> 外文期刊>Astrobiology >Protection of Nitrate-Reducing Fe(II)-Oxidizing Bacteria from UV Radiation by Biogenic Fe(III) Minerals
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Protection of Nitrate-Reducing Fe(II)-Oxidizing Bacteria from UV Radiation by Biogenic Fe(III) Minerals

机译：生物源铁（III）矿物质对还原硝酸盐的Fe（II）氧化细菌的紫外线辐射的防护

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摘要

Due to the lack of an ozone layer in the Archean, ultraviolet radiation (UVR) reached early Earth's surface almost unattenuated; as a consequence, a terrestrial biosphere in the form of biological soil crusts would have been highly susceptible to lethal doses of irradiation. However, a self-produced external screen in the form of nanoparticular Fe(III) minerals could have effectively protected those early microorganisms. In this study, we use viability studies by quantifying colony-forming units (CFUs), as well as Fe(II) oxidation and nitrate reduction rates, to show that encrustation in biogenic and abiogenic Fe(III) minerals can protect a common soil bacteria such as the nitrate-reducing Fe(II)-oxidizing microorganisms Acidovorax sp. strain BoFeN1 and strain 2AN from harmful UVC radiation. Analysis of DNA damage by quantifying cyclobutane pyrimidine dimers (CPD) confirmed the protecting effect by Fe(III) minerals. This study suggests that Fe(II)-oxidizing microorganisms, as would have grown in association with mafic and ultramafic soils/outcrops, would have been able to produce their own UV screen, enabling them to live in terrestrial habitats on early Earth.
机译：由于太古代中缺少臭氧层，紫外辐射（UVR）到达地球早期的表面几乎没有衰减。结果，以生物土壤结壳形式的陆地生物圈将极易受到致命剂量的辐射。但是，以纳米颗粒Fe（III）矿物的形式自产的外部筛网可以有效地保护那些早期微生物。在这项研究中，我们通过量化菌落形成单位（CFU）以及Fe（II）氧化和硝酸盐还原速率的可行性研究，来表明生物和非生物Fe（III）矿物中的结壳可以保护常见的土壤细菌例如还原硝酸盐的Fe（II）氧化微生物Acidovorax sp。来自有害UVC辐射的BoFeN1菌株和2AN菌株。通过定量环丁烷嘧啶二聚体（CPD）进行的DNA损伤分析证实了Fe（III）矿物的保护作用。这项研究表明，氧化铁（II）微生物（与铁镁质和超镁铁质土壤/露头一起生长）将能够产生自己的紫外线屏，使它们能够生活在地球早期的陆地栖息地中。

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  • 来源
    《Astrobiology》 |2016年第4期|301-310|共10页
  • 作者

    Gauger Tina; Konhauser Kurt; Kappler Andreas;

  • 作者单位

    Univ Tubingen, Ctr Appl Geosci, Geomicrobiol, Sigwartstr 10, D-72076 Tubingen, Germany;

    Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB, Canada;

    Univ Tubingen, Ctr Appl Geosci, Geomicrobiol, Sigwartstr 10, D-72076 Tubingen, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Archean; Biominerals; UVR; Protection;

    机译：太古代;生物矿物;紫外线辐射;保护;

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