Root exudate composition reflects drought severity gradient in blue grama (Bouteloua gracilis)

Ulrich, Danielle E. M.; Clendinen, Chaevien S.; Alongi, Franklin; Mueller, Rebecca C.; Chu, Rosalie K.; Toyoda, Jason; Gallegos-Graves, La Verne; Goemann, Hannah M.; Peyton, Brent; Sevanto, Sanna; Dunbar, John

doi:10.1038/s41598-022-16408-8

Root exudate composition reflects drought severity gradient in blue grama (Bouteloua gracilis)

Journal Article · Fri Jul 22 00:00:00 EDT 2022 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-022-16408-8· OSTI ID:1877432

Ulrich, Danielle E. M.; Clendinen, Chaevien S.; Alongi, Franklin; Mueller, Rebecca C.; Chu, Rosalie K.; Toyoda, Jason; Gallegos-Graves, La Verne; Goemann, Hannah M.; Peyton, Brent; Sevanto, Sanna; Dunbar, John

Abstract

Plant survival during environmental stress greatly affects ecosystem carbon (C) cycling, and plant–microbe interactions are central to plant stress survival. The release of C-rich root exudates is a key mechanism plants use to manage their microbiome, attracting beneficial microbes and/or suppressing harmful microbes to help plants withstand environmental stress. However, a critical knowledge gap is how plants alter root exudate concentration and composition under varying stress levels. In a greenhouse study, we imposed three drought treatments (control, mild, severe) on blue grama ( Bouteloua gracilis Kunth Lag. Ex Griffiths), and measured plant physiology and root exudate concentration and composition using GC–MS, NMR, and FTICR. With increasing drought severity, root exudate total C and organic C increased concurrently with declining predawn leaf water potential and photosynthesis. Root exudate composition mirrored the physiological gradient of drought severity treatments. Specific compounds that are known to alter plant drought responses and the rhizosphere microbiome mirrored the drought severity-induced root exudate compositional gradient. Despite reducing C uptake, these plants actively invested C to root exudates with increasing drought severity. Patterns of plant physiology and root exudate concentration and composition co-varied along a gradient of drought severity.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: 89233218CNA000001; AC05-76RL01830

OSTI ID:: 1877432

Alternate ID(s):: OSTI ID: 1881815
OSTI ID: 2461608

Report Number(s):: LA-UR--21-31831; PNNL-SA--177718; 12581; PII: 16408

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 12; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Severe and mild drought cause distinct phylogenetically linked shifts in the blue grama (Bouteloua gracilis) rhizobiome

Journal Article · Wed Jan 10 19:00:00 EST 2024 · Frontiers in Microbiomes · OSTI ID:2281079

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59 BASIC BIOLOGICAL SCIENCES
Biological Science
C allocation
Drought
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Plant physiology
Plant-Microbe Interactions
Root exudates
drought severity
metabolomics

Root exudate composition reflects drought severity gradient in blue grama (Bouteloua gracilis)

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