Mycobiont contribution to tundra plant acquisition of permafrost-derived nitrogen

Mycobiont contribution to tundra plant acquisition of permafrost-derived nitrogen

© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 226(2020), 1 vom: 15. Apr., Seite 126-141
1. Verfasser: Hewitt, Rebecca E (VerfasserIn)
Weitere Verfasser: DeVan, M Rae, Lagutina, Irina V, Genet, Helene, McGuire, A David, Taylor, D Lee, Mack, Michelle C
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, U.S. Gov't, Non-P.H.S. Alaska active layer ectomycorrhizal (ECM) fungi ericoid mycorrhizal (ERM) fungi fungal internal transcribed spacer (ITS) isotope 15N moist acidic tundra Soil mehr... Nitrogen N762921K75
Beschreibung
Zusammenfassung:© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.
As Arctic soils warm, thawed permafrost releases nitrogen (N) that could stimulate plant productivity and thus offset soil carbon losses from tundra ecosystems. Although mycorrhizal fungi could facilitate plant access to permafrost-derived N, their exploration capacity beyond host plant root systems into deep, cold active layer soils adjacent to the permafrost table is unknown. We characterized root-associated fungi (RAF) that colonized ericoid (ERM) and ectomycorrhizal (ECM) shrub roots and occurred below the maximum rooting depth in permafrost thaw-front soil in tussock and shrub tundra communities. We explored the relationships between root and thaw front fungal composition and plant uptake of a 15 N tracer applied at the permafrost boundary. We show that ERM and ECM shrubs associate with RAF at the thaw front providing evidence for potential mycelial connectivity between roots and the permafrost boundary. Among shrubs and tundra communities, RAF connectivity to the thaw boundary was ubiquitous. The occurrence of particular RAF in both roots and thaw front soil was positively correlated with 15 N recovered in shrub biomass Taxon-specific RAF associations could be a mechanism for the vertical redistribution of deep, permafrost-derived nutrients, which may alleviate N limitation and stimulate productivity in warming tundra
Beschreibung:Date Completed 26.04.2021
Date Revised 26.04.2021
published: Print-Electronic
CommentIn: New Phytol. 2020 Apr;226(1):8-10. - PMID 32053735
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.16235