Experimental warming alters the community composition, diversity, and N2 fixation activity of peat moss (Sphagnum fallax) microbiomes

Carrell, Alyssa A.; Kolton, Max; Glass, Jennifer B.; Pelletier, Dale A.; Warren, Melissa J.; Kostka, Joel E.; Iversen, Colleen M.; Hanson, Paul J.; Weston, David J.

doi:10.1111/gcb.14715

Title: Experimental warming alters the community composition, diversity, and N₂ fixation activity of peat moss (Sphagnum fallax) microbiomes

Journal Article · 27 May 2019 · Global Change Biology

DOI: https://doi.org/10.1111/gcb.14715 · OSTI ID:1560689

^[1]; Kolton, Max ^[2];

^[2];

^[3]; Warren, Melissa J. ^[2]; Kostka, Joel E. ^[2];

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Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

SphagnumSphagnum are known to harbor diverse microbial communities that mediate C and nitrogen (N) cycling in peatlands, the effects of climate change on Sphagnum microbiome composition and functioning are largely unknown. We investigated the impacts of experimental whole-ecosystem warming on the Sphagnum moss microbiome, focusing on N₂ fixing microorganisms (diazotrophs). To characterize the microbiome response to warming, we performed next-generation sequencing of small subunit (SSU) rRNA and nitrogenase (niƒH) gene amplicons and quantified rates of N₂ fixation activity in Sphagnum fallax2 fixation rates, decreased with warming (p < 0.05). Following warming, diazotrophs shifted from a mixed community of Nostocales (Cyanobacteria) and Rhizobiales (Alphaproteobacteria) to predominance of Nostocales. Microbiome community composition differed between years, with some diazotroph populations persisting while others declined in relative abundance in warmed plots in the second year. Our results demonstrate that warming substantially alters the community composition, diversity, and N₂ fixation activity of peat moss microbiomes, which may ultimately impact host fitness, ecosystem productivity, and C storage potential in peatlands.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725; SC0007144; SC0012088

OSTI ID:: 1560689

Alternate ID(s):: OSTI ID: 1559747; OSTI ID: 1560690

Journal Information:: Global Change Biology, Vol. 25, Issue 9; ISSN 1354-1013

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 68 works

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Stough, Joshua M. A.; Kolton, Max; Kostka, Joel E.; +4 more

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59 BASIC BIOLOGICAL SCIENCES

Title: Experimental warming alters the community composition, diversity, and N2 fixation activity of peat moss (Sphagnum fallax) microbiomes

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Title: Experimental warming alters the community composition, diversity, and N₂ fixation activity of peat moss (Sphagnum fallax) microbiomes