Host-linked soil viral ecology along a permafrost thaw gradient

Nature Microbiology
Joanne B EmersonMatthew B Sullivan

Abstract

Climate change threatens to release abundant carbon that is sequestered at high latitudes, but the constraints on microbial metabolisms that mediate the release of methane and carbon dioxide are poorly understood1-7. The role of viruses, which are known to affect microbial dynamics, metabolism and biogeochemistry in the oceans8-10, remains largely unexplored in soil. Here, we aimed to investigate how viruses influence microbial ecology and carbon metabolism in peatland soils along a permafrost thaw gradient in Sweden. We recovered 1,907 viral populations (genomes and large genome fragments) from 197 bulk soil and size-fractionated metagenomes, 58% of which were detected in metatranscriptomes and presumed to be active. In silico predictions linked 35% of the viruses to microbial host populations, highlighting likely viral predators of key carbon-cycling microorganisms, including methanogens and methanotrophs. Lineage-specific virus/host ratios varied, suggesting that viral infection dynamics may differentially impact microbial responses to a changing climate. Virus-encoded glycoside hydrolases, including an endomannanase with confirmed functional activity, indicated that viruses influence complex carbon degradation and that vira...Continue Reading

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Datasets Mentioned

BETA
PRJNA386568
QGNH00000000

Software Mentioned

SigmaPlot
CyVerse
PLS
SortMeRNA
crass
PHYRE2
PRIMER
USEARCH
PROKKA
MetaProdigal

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