Response of nitrite-dependent anaerobic methanotrophs to elevated atmospheric CO2 concentration in paddy fields

文献类型： 外文期刊

第一作者： Tian, Mao-hui

作者： Tian, Mao-hui;Shen, Li-dong;Liu, Xin;Bai, Ya-nan;Hu, Zheng-hua;Jin, Jing-hao;Yang, Wang-ting;Yang, Yu-ling;Liu, Jia-qi;Feng, Yan-fang;Liu, Yang

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关键词： Elevated CO2 concentration; Nitrite-dependent anaerobic methane oxidation; Abundance; Activity; Positive response; Paddy field

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）

ISSN： 0048-9697

年卷期： 2021 年 801 卷

页码：

收录情况： SCI

摘要： Nitrite-dependent anaerobic methane oxidation (n-damo) catalyzed by Candidatus Methylomirabilis oxyfera (M. oxyfera)-like bacteria is a new pathway for the regulation of methane emissions from paddy fields. Elevated atmospheric CO2 concentrations (e[CO2]) can indirectly affect the structure and function of microbial communities. However, the response of M. oxyfera-like bacteria to e[CO2] is currently unknown. Here, we investigated the effect of e[CO2] (ambient CO2 + 200 ppm) on community composition, abundance, and activity of M. oxyfera-like bacteria at different depths (0-5, 5-10, and 10-20 cm) in paddy fields across multiple rice growth stages (tillering, jointing, and flowering). High-throughput sequencing showed that e[CO2] had no significant effect on the community composition of M. oxyfera-like bacteria. However, quantitative PCR suggested that the 16S rRNA gene abundance of M. oxyfera-like bacteria increased significantly in soil under e[CO2], particularly at the tillering stage. Furthermore, (CH4)-C-13 tracer experiments showed potential n-damo activity of 0.31-8.91 nmol CO2 g(-1) (dry soil) d(-1). E[CO2] significantly stimulated n-damo activity, especially at the jointing and flowering stages. The n-damo activity and abundance of M. oxyfera-like bacteria increased by an average of 90.9% and 50.0%, respectively, under e[CO2]. Correlation analysis showed that the increase in soil dissolved organic carbon content caused by e[CO2] had significant effects on the activity and abundance of M. oxyfera- like bacteria. Overall, this study provides the first evidence for a positive response of M. oxyfera-like bacteria to e[CO2], which may help reduce methane emissions from paddy fields under future climate change conditions. (C) 2021 Elsevier B.V. All rights reserved.

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