气候变化领域集成服务门户(CCPortal): Termite gas emissions select for hydrogenotrophic microbial communities in termite mounds

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DOI	10.1073/pnas.2102625118
	Termite gas emissions select for hydrogenotrophic microbial communities in termite mounds
	Chiri E.; Nauer P.A.; Lappan R.; Jirapanjawat T.; Waite D.W.; Handley K.M.; Hugenholtz P.; Cook P.L.M.; Arndt S.K.; Greening C.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:30
英文摘要	Organoheterotrophs are the dominant bacteria in most soils worldwide. While many of these bacteria can subsist on atmospheric hydrogen (H2), levels of this gas are generally insufficient to sustain hydrogenotrophic growth. In contrast, bacteria residing within soil-derived termite mounds are exposed to high fluxes of H2 due to fermentative production within termite guts. Here, we show through community, metagenomic, and biogeochemical profiling that termite emissions select for a community dominated by diverse hydrogenotrophic Actinobacteriota and Dormibacterota. Based on metagenomic short reads and derived genomes, uptake hydrogenase and chemosynthetic RuBisCO genes were significantly enriched in mounds compared to surrounding soils. In situ and ex situ measurements confirmed that high- and low-affinity H2-oxidizing bacteria were highly active in the mounds, such that they efficiently consumed all termite-derived H2 emissions and served as net sinks of atmospheric H2. Concordant findings were observed across the mounds of three different Australian termite species, with termite activity strongly predicting H2 oxidation rates (R2 = 0.82). Cell-specific power calculations confirmed the potential for hydrogenotrophic growth in the mounds with most termite activity. In contrast, while methane is produced at similar rates to H2 by termites, mounds contained few methanotrophs and were net sources of methane. Altogether, these findings provide further evidence of a highly responsive terrestrial sink for H2 but not methane and suggest H2 availability shapes composition and activity of microbial communities. They also reveal a unique arthropod–bacteria interaction dependent on H2 transfer between host-associated and free-living microbial communities. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Hydrogen \| lithoautotrophy \| termite \| Actinobacteria \| trace gas
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238465
作者单位	Department of Microbiology, Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia; School of Ecosystem and Forest Sciences, University of Melbourne, Richmond, VIC 3121, Australia; School of Chemistry, Monash University, Clayton, VIC 3800, Australia; School of Biological Sciences, University of Auckland, Auckland, New Zealand; Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland, St. Lucia, QLD 4072, Australia
推荐引用方式 GB/T 7714	Chiri E.,Nauer P.A.,Lappan R.,et al. Termite gas emissions select for hydrogenotrophic microbial communities in termite mounds[J],2021,118(30).
APA	Chiri E..,Nauer P.A..,Lappan R..,Jirapanjawat T..,Waite D.W..,...&Greening C..(2021).Termite gas emissions select for hydrogenotrophic microbial communities in termite mounds.Proceedings of the National Academy of Sciences of the United States of America,118(30).
MLA	Chiri E.,et al."Termite gas emissions select for hydrogenotrophic microbial communities in termite mounds".Proceedings of the National Academy of Sciences of the United States of America 118.30(2021).