达玛冰川不同低温层栖息地的微生物遗传潜力各不相同。

IF 4 2区 生物学 Q1 GENETICS & HEREDITY
Maomao Feng, Serina Robinson, Weihong Qi, Arwyn Edwards, Beat Stierli, Marcel van der Heijden, Beat Frey, Gilda Varliero
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引用次数: 0

摘要

气候变暖导致全球冰川退缩。对冰川微生物组的分类和功能进行研究有助于我们更好地预测它们对冰川融化的反应。在这里,我们利用枪式元基因组测序技术研究了不同冰冻圈栖息地的微生物功能潜力,这些栖息地包括地表雪、超冰川和亚冰川沉积物、亚冰川冰、前冰川溪水和新近冰川消融的土壤。不同栖息地的功能基因结构差异很大,尤其是雪地的功能基因结构与所有其他栖息地的功能基因结构差异很大。丰度差异分析表明,冰栖息地富含与应激反应有关的基因(如伴侣蛋白),这证明冰川对微生物来说是一个严酷的环境。与碳和氮循环有关的微生物代谢能力在不同的冰层生境中有所不同。与辅助活动有关的基因在冰川下沉积物中的代表性较高,这表明降解难降解碳(如木质素)的基因潜力较大。至于氮循环,与固氮相关的基因在贫瘠的冰前土壤中更为丰富,这可能是由于在这一生境中存在蓝细菌群。我们的研究结果加深了我们对冰川生态系统中微生物过程的了解,冰川生态系统很容易受到全球持续变暖的影响,这些结果对下游生态系统也有影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microbial genetic potential differs among cryospheric habitats of the Damma glacier.

Climate warming has led to glacier retreat worldwide. Studies on the taxonomy and functions of glacier microbiomes help us better predict their response to glacier melting. Here, we used shotgun metagenomic sequencing to study the microbial functional potential in different cryospheric habitats, i.e. surface snow, supraglacial and subglacial sediments, subglacial ice, proglacial stream water and recently deglaciated soils. The functional gene structure varied greatly among habitats, especially for snow, which differed significantly from all other habitats. Differential abundance analysis revealed that genes related to stress responses (e.g. chaperones) were enriched in ice habitat, supporting the fact that glaciers are a harsh environment for microbes. The microbial metabolic capabilities related to carbon and nitrogen cycling vary among cryospheric habitats. Genes related to auxiliary activities were overrepresented in the subglacial sediment, suggesting a higher genetic potential for the degradation of recalcitrant carbon (e.g., lignin). As for nitrogen cycling, genes related to nitrogen fixation were more abundant in barren proglacial soils, possibly due to the presence of Cyanobacteriota in this habitat. Our results deepen our understanding of microbial processes in glacial ecosystems, which are vulnerable to ongoing global warming, and they have implications for downstream ecosystems.

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来源期刊
Microbial Genomics
Microbial Genomics Medicine-Epidemiology
CiteScore
6.60
自引率
2.60%
发文量
153
审稿时长
12 weeks
期刊介绍: Microbial Genomics (MGen) is a fully open access, mandatory open data and peer-reviewed journal publishing high-profile original research on archaea, bacteria, microbial eukaryotes and viruses.
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