Distance to the water table shapes the diversity and activity of DNA and RNA viruses in a subalpine peatland

IF 10.3 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Ziye Xiong , Xuan Qiu , Xing Xiang , Lanlan Cai , Nian Wang , Xianyu Huang , Hongmei Wang
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Abstract

Peatlands are essential reservoirs of carbon and critical zones for the cycling of greenhouse gases on Earth. Their ecological functions are primarily governed by the microbial communities inhabiting them, which vary with hydrological conditions. However, the roles of viruses in peatland ecosystems remain poorly understood despite their abundance and ubiquity. To address this gap, viral communities, their ecological roles, and their responses to environmental factors were explored using viromics, metatranscriptomics, and physicochemical property analyses of nine peat sediments collected from various layers of three profiles with different water table levels in the Dajiuhu Peatland, central China. This study revealed that the distance to the water table (DWT) significantly influenced the composition and function of viral communities by altering the levels of redox potential and total organic carbon, which in turn affected methane (CH4) concentrations in pore water. Furthermore, a notable abundance of putative auxiliary metabolic genes associated with methane, nitrogen, and sulfur metabolism was identified in peatland DNA viruses, with their community composition strongly regulated by DWT. Additionally, functional genes related to oxidative phosphorylation and cysteine synthesis were detected for the first time in peatland RNA viruses. This study advances our comprehension of how hydrological conditions affect viral communities in peatlands, provides new insights into the impact of viruses on the CH4 cycle, and serves as a crucial reference for future investigations into the ecological roles of viruses.

Abstract Image

Abstract Image

与地下水位的距离决定了亚高山泥炭地DNA和RNA病毒的多样性和活性
泥炭地是碳的重要储存库,也是地球上温室气体循环的关键区域。它们的生态功能主要由居住在其中的微生物群落控制,这些微生物群落随水文条件而变化。然而,尽管病毒在泥炭地生态系统中数量众多且无处不在,但人们对它们的作用仍知之甚少。为了解决这一空白,利用病毒组学、超转录组学和物理化学性质分析,对中国中部大九湖泥炭地3条不同地下水位剖面不同层的9种泥炭沉积物进行了病毒群落、生态作用及其对环境因子的响应研究。该研究表明,距离地下水位(DWT)的距离通过改变氧化还原电位和总有机碳的水平,从而影响孔隙水中甲烷(CH4)的浓度,从而显著影响病毒群落的组成和功能。此外,泥炭地DNA病毒中发现了大量与甲烷、氮和硫代谢相关的推定辅助代谢基因,其群落组成受DWT的强烈调节。此外,在泥炭地RNA病毒中首次检测到与氧化磷酸化和半胱氨酸合成相关的功能基因。该研究促进了我们对泥炭地水文条件如何影响病毒群落的理解,为病毒对CH4循环的影响提供了新的见解,并为进一步研究病毒的生态作用提供了重要参考。
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来源期刊
Environment International
Environment International 环境科学-环境科学
CiteScore
21.90
自引率
3.40%
发文量
734
审稿时长
2.8 months
期刊介绍: Environmental Health publishes manuscripts focusing on critical aspects of environmental and occupational medicine, including studies in toxicology and epidemiology, to illuminate the human health implications of exposure to environmental hazards. The journal adopts an open-access model and practices open peer review. It caters to scientists and practitioners across all environmental science domains, directly or indirectly impacting human health and well-being. With a commitment to enhancing the prevention of environmentally-related health risks, Environmental Health serves as a public health journal for the community and scientists engaged in matters of public health significance concerning the environment.
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