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Influence of zygomycete‐derived D 'orenone on IAA signalling in T richoloma ‐spruce ectomycorrhiza
Author(s) -
Wagner Katharina,
Krause Katrin,
David Anja,
Kai Marco,
Jung ElkeMartina,
Sammer Dominik,
Kniemeyer Olaf,
Boland Wilhelm,
Kothe Erika
Publication year - 2016
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.13160
Subject(s) - biology , ectomycorrhiza , symbiosis , fungus , botany , auxin , host (biology) , biochemistry , mycorrhiza , bacteria , ecology , gene , genetics
Summary Despite the rising interest in microbial communication, only few studies relate to mycorrhization and the pool of potential morphogenic substances produced by the surrounding soil community. Here, we investigated the effect exerted by the C 18 ‐ ketone β‐apo‐13‐carotenone, D 'orenone, on the ectomycorrhizal basidiomycete T richoloma vaccinum and its symbiosis with the economically important host tree, spruce ( P icea abies ). D 'orenone is an early intermediate in the biosynthesis of morphogens in sexual development of mucoromycetes, the trisporoids. In the ectomycorrhizal fungus T . vaccinum, D 'orenone increased the production and/or release of the phytohormone indole‐3‐acetic acid ( IAA ) which had been proposed to be involved in the mutual symbiosis. The induced expression of the fungal aldehyde dehydrogenase, A ld5 is associated with IAA synthesis and excretion. In the host tree, D 'orenone modulated root architecture by increasing lateral root length and hypertrophy of root cortex cells, likely via changed IAA concentrations and flux. Thus, we report for the first time on carotenoid metabolites from soil fungi affecting both ectomycorrhizal partners. The data imply a complex network of functions for secondary metabolites which act in an inter‐kingdom signalling in soil.