Functionally discrete fine roots differ in microbial assembly, microbial functional potential, and produced metabolites

King, William L.; Yates, Caylon F.; Cao, Lily; O'Rourke‐Ibach, Sean; Fleishman, Suzanne M.; Richards, Sarah C.; Centinari, Michela; Hafner, Benjamin D.; Goebel, Marc; Bauerle, Taryn; Kim, Young‐Mo; Nicora, Carrie D.; Anderton, Christopher R.; Eissenstat, David M.; Bell, Terrence H.

doi:10.1111/pce.14705

Title: Functionally discrete fine roots differ in microbial assembly, microbial functional potential, and produced metabolites

Journal Article · 07 September 2023 · Plant, Cell and Environment

DOI: https://doi.org/10.1111/pce.14705 · OSTI ID:2229533

^[1]; Yates, Caylon F. ^[2]; Cao, Lily ^[2]; O'Rourke‐Ibach, Sean ^[2]; Fleishman, Suzanne M. ^[2]; Richards, Sarah C. ^[2]; Centinari, Michela ^[2];

^[3]; Goebel, Marc ^[3]; Bauerle, Taryn ^[3]; Kim, Young‐Mo ^[4]; Nicora, Carrie D. ^[4];

^[4]; Eissenstat, David M. ^[2];

^[5]

Pennsylvania State University, University Park, PA (United States); Cornell University, Ithaca, NY (United States)
Pennsylvania State University, University Park, PA (United States)
Cornell University, Ithaca, NY (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Pennsylvania State University, University Park, PA (United States); University of Toronto Scarborough, ON (Canada)

Traditionally, fine roots were grouped using arbitrary size categories, rarely capturing the heterogeneity in physiology, morphology and functionality among different fine root orders. Fine roots with different functional roles are rarely separated in microbiome-focused studies and may result in confounding microbial signals and host-filtering across different root microbiome compartments. Using a 26-year-old common garden, we sampled fine roots from four temperate tree species that varied in root morphology and sorted them into absorptive and transportive fine roots. The rhizoplane and rhizosphere were characterized using 16S rRNA gene and internal transcribed spacer region amplicon sequencing and shotgun metagenomics for the rhizoplane to identify potential microbial functions. Fine roots were subject to metabolomics to spatially characterize resource availability. Both fungi and bacteria differed according to root functional type. We observed additional differences between the bacterial rhizoplane and rhizosphere compartments for absorptive but not transportive fine roots. Rhizoplane bacteria, as well as the root metabolome and potential microbial functions, differed between absorptive and transportive fine roots, but not the rhizosphere bacteria. Functional differences were driven by sugar transport, peptidases and urea transport. Our data highlights the importance of root function when examining root-microbial relationships, emphasizing different host selective pressures imparted on different root microbiome compartments.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2229533

Report Number(s):: PNNL-SA--181002

Journal Information:: Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 12 Vol. 46; ISSN 0140-7791

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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