Responses of vascular plant fine roots and associated microbial communities to whole-ecosystem warming and elevated CO 2 in northern peatlands.

Autor: Duchesneau K; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA.; Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, GA, 30332, USA., Defrenne CE; College of Forest Resources and Environmental Science, Michigan Technological University, Houghton, MI, 49931, USA., Petro C; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA.; Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, GA, 30332, USA., Malhotra A; Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA., Moore JAM; Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA, 99354, USA., Childs J; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA., Hanson PJ; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA.; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Iversen CM; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37830, USA.; Climate Change Science Institute and Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA., Kostka JE; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA.; Center for Microbial Dynamics and Infection, Georgia Institute of Technology, Atlanta, GA, 30332, USA.; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2024 May; Vol. 242 (3), pp. 1333-1347. Date of Electronic Publication: 2024 Mar 21.
DOI: 10.1111/nph.19690
Abstrakt: Warming and elevated CO 2 (eCO 2 ) are expected to facilitate vascular plant encroachment in peatlands. The rhizosphere, where microbial activity is fueled by root turnover and exudates, plays a crucial role in biogeochemical cycling, and will likely at least partially dictate the response of the belowground carbon cycle to climate changes. We leveraged the Spruce and Peatland Responses Under Changing Environments (SPRUCE) experiment, to explore the effects of a whole-ecosystem warming gradient (+0°C to 9°C) and eCO 2 on vascular plant fine roots and their associated microbes. We combined trait-based approaches with the profiling of fungal and prokaryote communities in plant roots and rhizospheres, through amplicon sequencing. Warming promoted self-reliance for resource uptake in trees and shrubs, while saprophytic fungi and putative chemoorganoheterotrophic bacteria utilizing plant-derived carbon substrates were favored in the root zone. Conversely, eCO 2 promoted associations between trees and ectomycorrhizal fungi. Trees mostly associated with short-distance exploration-type fungi that preferentially use labile soil N. Additionally, eCO 2 decreased the relative abundance of saprotrophs in tree roots. Our results indicate that plant fine-root trait variation is a crucial mechanism through which vascular plants in peatlands respond to climate change via their influence on microbial communities that regulate biogeochemical cycles.
(© 2024 The Authors. New Phytologist © 2024 New Phytologist Foundation.)
Databáze: MEDLINE
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