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Do fungivores trigger the transfer of protective metabolites from host plants to arbuscular mycorrhizal hyphae?
Author(s) -
Duhamel Marie,
Pel Roel,
Ooms Astra,
Bücking Heike,
Jansa Jan,
Ellers Jacintha,
van Straalen Nico M.,
Wouda Tjalf,
Vandenkoornhuyse Philippe,
Kiers E. Toby
Publication year - 2013
Publication title -
ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.144
H-Index - 294
eISSN - 1939-9170
pISSN - 0012-9658
DOI - 10.1890/12-1943.1
Subject(s) - biology , catalpol , host (biology) , hypha , botany , trophic level , ecology , glycoside
A key objective in ecology is to understand how cooperative strategies evolve and are maintained in species networks. Here, we focus on the tri‐trophic relationship between arbuscular mycorrhizal (AM) fungi, host plants, and fungivores to ask if host plants are able to protect their mutualistic mycorrhizal partners from being grazed. Specifically, we test whether secondary metabolites are transferred from hosts to fungal partners to increase their defense against fungivores. We grew Plantago lanceolata hosts with and without mycorrhizal inoculum, and in the presence or absence of fungivorous springtails. We then measured fungivore effects on host biomass and mycorrhizal abundance (using quantitative PCR) in roots and soil. We used high‐performance liquid chromatography to measure host metabolites in roots, shoots, and hyphae, focusing on catalpol, aucubin, and verbascoside. Our most striking result was that the metabolite catalpol was consistently found in AM fungal hyphae in host plants exposed to fungivores. When fungivores were absent, catalpol was undetectable in hyphae. Our results highlight the potential for plant‐mediated protection of the mycorrhizal hyphal network.