Biotic and Environmental Drivers of Plant Microbiomes Across a Permafrost Thaw Gradient

Hough, Moira; McClure, Amelia; Bolduc, Benjamin; Dorrepaal, Ellen; Saleska, Scott; Klepac-Ceraj, Vanja; Rich, Virginia

doi:10.3389/fmicb.2020.00796

Title: Biotic and Environmental Drivers of Plant Microbiomes Across a Permafrost Thaw Gradient

Journal Article · Fri May 15 00:00:00 EDT 2020 · Frontiers in Microbiology

DOI:https://doi.org/10.3389/fmicb.2020.00796· OSTI ID:1618929

Hough, Moira; McClure, Amelia; Bolduc, Benjamin; Dorrepaal, Ellen; Saleska, Scott; Klepac-Ceraj, Vanja; Rich, Virginia

Plant-associated microbiomes are structured by environmental conditions and plant associates, both of which are being altered by climate change. The future structure of plant microbiomes will depend on the, largely unknown, relative importance of each. This uncertainty is particularly relevant for arctic peatlands, which are undergoing large shifts in plant communities and soil microbiomes as permafrost thaws, and are potentially appreciable sources of climate change feedbacks due to their soil carbon (C) storage. We characterized phyllosphere and rhizosphere microbiomes of six plant species, and bulk peat, across a permafrost thaw progression (from intact permafrost, to partiallyand fully-thawed stages) via 16S rRNA gene amplicon sequencing. We tested the hypothesis that the relative influence of biotic versus environmental filtering (the role of plant species versus thaw-defined habitat) in structuring microbial communities would differ among phyllosphere, rhizosphere, and bulk peat. Using both abundance- and phylogenetic-based approaches, we found that phyllosphere microbial composition was more strongly explained by plant associate, with little influence of habitat, whereas in the rhizosphere, plant and habitat had similar influence. Network-based community analyses showed that keystone taxa exhibited similar patterns with stronger responses to drivers. However, plant associates appeared to have a larger influence on organisms belonging to families associated with methane-cycling than the bulk community. Putative methanogens were more strongly influenced by plant than habitat in the rhizosphere, and in the phyllosphere putative methanotrophs were more strongly influenced by plant than was the community at large. We conclude that biotic effects can be stronger than environmental filtering, but their relative importance varies among microbial groups. For most microbes in this system, biotic filtering was stronger aboveground than belowground. However, for putative methane-cyclers, plant associations have a stronger influence on community composition than environment despite major hydrological changes with thaw. This suggests that plant successional dynamics may be as important as hydrological changes in determining microbial relevance to C-cycling climate feedbacks. By partitioning the degree that plant versus environmental filtering drives microbiome composition and function we can improve our ability to predict the consequences of warming for C-cycling in other arctic areas undergoing similar permafrost thaw transitions.

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Research Organization:: Univ. of Arizona, Tucson, AZ (United States); The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0016440; SC0010580

OSTI ID:: 1618929

Alternate ID(s):: OSTI ID: 1802132

Journal Information:: Frontiers in Microbiology, Journal Name: Frontiers in Microbiology Vol. 11; ISSN 1664-302X

Publisher:: Frontiers Media SACopyright Statement

Country of Publication:: Switzerland

Language:: English

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Cited by: 17 works

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59 BASIC BIOLOGICAL SCIENCES
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IsoGenie Project
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Title: Biotic and Environmental Drivers of Plant Microbiomes Across a Permafrost Thaw Gradient

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