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Arthrinium phaeospermum isolated from Tuber borchii ascomata: the first evidence for a “Mycorrhization Helper Fungus”?
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Arthrinium phaeospermum isolated from Tuber borchii ascomata: the first evidence for a “Mycorrhization Helper Fungus”?
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Journal Article
Arthrinium phaeospermum isolated from Tuber borchii ascomata: the first evidence for a “Mycorrhization Helper Fungus”?
2015
Overview
A filamentous fungus was isolated from
Tuber borchii
Vitt. fruiting bodies, and it was identified as an
Arthrinium phaeospermum
(Corda) M.B. Ellis strain, an “endophyte” that forms various associations with healthy leaves, stems, and roots of plants. Molecular analysis confirmed the association of this filamentous fungus with the ascocarps of all collection sites in Salento, Apulia (South Italy). An in vitro symbiosis system between
Cistus creticus
L. and
T. borchii
was set up;
A. phaeospermum
appears to be able to promote mycorrhiza formation in
Cistus
seedlings, inducing primary root shortening and an increase of secondary roots, similar to the effect of Mycorrhization Helper Bacteria (MHB). Compartmented and uncompartmented bioassays were carried out to investigate the effects of exudates/volatiles released by the truffle-hosted fungus on root architecture; the results showed root shortening in compartmented bioassay suggesting that volatiles released by the fungus alone are sufficient to alter root morphology in early phase of interaction before the mycorrhiza formation. The first evidence for an influence of a truffle-hosted fungus on ectomycorrhizal symbiosis establishment is reported.
