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Brandt, L.* ; Abrahão, A.* ; Wicht, A.-C. ; Schulz, S. ; Schloter, M. ; Schweizer, S.* ; Marhan, S.* ; Kandeler, E.*

Reciprocal transport of carbon and nitrogen between plants and the hyphosphere microbiome in a temperate grassland.

New Phytol., DOI: 10.1111/nph.71576 (2026)
Verlagsversion Forschungsdaten DOI PMC
Open Access Hybrid
Creative Commons Lizenzvertrag
Despite its relevance for plant nutrient acquisition, the role of the hyphosphere in structuring fungal-bacterial networks and mediating carbon-nitrogen (C-N) exchange under field conditions remains unclear. We therefore examined reciprocal C-N fluxes along the plant-fungi-bacteria continuum and their link to microbial community assembly across grassland soil microhabitats. Sterilized compartmentalized ingrowth cores were exposed to soil in the field for 3 months. Plants were pulse-labeled with 13CO2 and 13C was traced into microbial biomarkers over 7 d. 15N-labeled urea was supplied to a hyphal compartment and isotope recovery in plants was quantified. We reconstructed microbial networks and visualized microscale isotope distributions. Plant-derived 13C was rapidly incorporated into fungi within 1 d and into hyphosphere bacteria after 7 d. Conversely, 16.9% of the initially added 150 μg 15N was transferred from the hyphal compartment to plants. Microbial diversity declined from the rooted toward the hyphal-dominated compartments, while networks reorganized with relatively more positive fungal-bacterial associations. Arbuscular mycorrhizal fungi act as primary channels of reciprocal C-N exchange, rapidly transporting newly fixed plant C into root-distant soil zones. More broadly, soil fungi act as ecological filters shaping bacterial assembly and may foster increasingly positive associations with bacteria in hyphal-dominated habitats.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Nanosims ; Arbuscular Mycorrhizal Fungi ; Carbon–nitrogen Exchange ; Cross‐kingdom Microbial Networks ; Fungal–bacterial Interactions ; Grassland Soil ; Hyphosphere ; Stable Isotope Labeling; Arbuscular Mycorrhizal Fungus; Soil Bacteria; Community; Root; Dispersal; Biomass; Litter; Flow; Quantification; Identification
ISSN (print) / ISBN 0028-646X
e-ISSN 1469-8137
Zeitschrift New Phytologist
Verlag Wiley
Verlagsort 111 River St, Hoboken 07030-5774, Nj Usa
Begutachtungsstatus Peer reviewed
Institut(e) Comparative Microbiome Analysis (COMI)
Förderungen Deutsche Forschungsgemeinschaft