The potential role of subseafloor fungi in driving the biogeochemical cycle of nitrogen under anaerobic conditions

文献类型： 外文期刊

第一作者： Jiang, Jun-Peng

作者： Jiang, Jun-Peng;Leng, Shuang;Liao, Yi-Fan;Liu, Xuan;Li, Dong-Xu;Chu, Chen;Liu, Chang-Hong;Yu, Xiang-Yang

作者机构：

关键词： Fungi; Submarine; Deep biosphere; Nitrogen cycle; Anaerobic metabolism

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 897 卷

页码：

收录情况： SCI

摘要： Fungi represent the dominant eukaryotic group of organisms in anoxic marine sedimentary ecosystems, ranging from a fewcentimeters to similar to 2.5 km belowseafloor. However, little is known about how fungi can colonize anaerobic subseafloor environments for tens of millions of years and whether they play a role in elemental biogeochemical cycles. Based on metabolite detection, isotope tracer and gene analysis, we examined the anaerobic nitrogen conversion pathways of 19 fungal species (40 strains) isolated from 1.3 to 2.5 km coal-bearing sediments below seafloor. Our results show for the first time that almost all fungi possess anaerobic denitrification, dissimilatory nitrate reduction to ammonium (DNRA), and nitrification pathways, but not anaerobic ammonium oxidation (anammox). Moreover, the distribution of fungi with different nitrogen-conversion abilities in subseafloor sediments was mainly determined by in situ temperature, CaCO3, and inorganic carbon contents. These findings suggest that fungi have multiple nitrogen transformation processes to cope with their requirements for a variety of nitrogen sources in nutrient deficient anaerobic subseafloor sedimentary environments.

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