Identification of host-derived chemical signals involved in the symbiotic interactions between ectomycorrhizal fungi and woody plants

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The aim of this study is to identify plant metabolites that act as a symbiotic signal in the ectomycorrhizal symbiosis. Strigolactones, which induce a host recognition response, hyphal branching, in arbuscular mycorrhizal fungi, have shown to be totally inactive on the ectomycorrhizal fungi, Pisolithus tinctorius and Tricholoma matsutake, in our newly developed bioassay. Root extracts and exudates from Eucalyptus have found to induce hyphal branching in P.tinctorius. This suggests that certain root metabolites other than strigolactones are produced in and exuded from Eucalyptus roots as a symbiotic signal for ectomycorrhizal fungi.