Exploring the transfer of recent plant photosynthates to soil microbes mycorrhizal pathway vs direct root exudation

Exploring the transfer of recent plant photosynthates to soil microbes : mycorrhizal pathway vs direct root exudation

© 2014 The Authors New Phytologist © 2014 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 205(2015), 4 vom: 28. März, Seite 1537-1551
1. Verfasser: Kaiser, Christina (VerfasserIn)
Weitere Verfasser: Kilburn, Matt R, Clode, Peta L, Fuchslueger, Lucia, Koranda, Marianne, Cliff, John B, Solaiman, Zakaria M, Murphy, Daniel V
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2015
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't NanoSIMS arbuscular mycorrhizal (AM) fungi belowground carbon allocation hyphosphere mycorrhizosphere priming effect recent photosynthates root exudates mehr... Biomarkers Carbon Isotopes Fatty Acids Nitrogen Isotopes Phospholipids Plant Exudates Carbon 7440-44-0 Nitrogen N762921K75
Beschreibung
Zusammenfassung:© 2014 The Authors New Phytologist © 2014 New Phytologist Trust.
Plants rapidly release photoassimilated carbon (C) to the soil via direct root exudation and associated mycorrhizal fungi, with both pathways promoting plant nutrient availability. This study aimed to explore these pathways from the root's vascular bundle to soil microbial communities. Using nanoscale secondary ion mass spectrometry (NanoSIMS) imaging and (13) C-phospho- and neutral lipid fatty acids, we traced in-situ flows of recently photoassimilated C of (13) CO2 -exposed wheat (Triticum aestivum) through arbuscular mycorrhiza (AM) into root- and hyphae-associated soil microbial communities. Intraradical hyphae of AM fungi were significantly (13) C-enriched compared to other root-cortex areas after 8 h of labelling. Immature fine root areas close to the root tip, where AM features were absent, showed signs of passive C loss and co-location of photoassimilates with nitrogen taken up from the soil solution. A significant and exclusively fresh proportion of (13) C-photosynthates was delivered through the AM pathway and was utilised by different microbial groups compared to C directly released by roots. Our results indicate that a major release of recent photosynthates into soil leave plant roots via AM intraradical hyphae already upstream of passive root exudations. AM fungi may act as a rapid hub for translocating fresh plant C to soil microbes
Beschreibung:Date Completed 28.09.2015
Date Revised 22.03.2024
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.13138