Investigations on the lack of appressorium formation in the roots of the non-host plant Lupinus albus L. showed that root exudates do not inhibit mycelial growth of the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae (Nicol. & Gerd.) Gerd. & Trappe, but that they hinder hyphal attachment and fungal recognition of roots. Exudates do not stimulate hyphal proliferation in the rhizosphere. G. mosseae hyphae were able to recognize and attach to excised roots of both lupin and host plants, forming swellings resembling appressoria. No growth of G. mosseae hyphae was observed around simulated roots consisting of nylon, silk, polyamide and glass threads, whereas appressoria were formed on heterologous hyphae of VAM fungal species. The hypothesis that a purely thigmotropic stimulus could trigger hyphal attachment and the further differentiation of appressoria was excluded.

Factors affecting appressorium development in the vesicular-arbuscular mycorrhizal fungus Glomus mosseae (Nicol. & Gerd.) Gerd. & Trappe

GIOVANNETTI, MANUELA;AVIO L;
1993

Abstract

Investigations on the lack of appressorium formation in the roots of the non-host plant Lupinus albus L. showed that root exudates do not inhibit mycelial growth of the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae (Nicol. & Gerd.) Gerd. & Trappe, but that they hinder hyphal attachment and fungal recognition of roots. Exudates do not stimulate hyphal proliferation in the rhizosphere. G. mosseae hyphae were able to recognize and attach to excised roots of both lupin and host plants, forming swellings resembling appressoria. No growth of G. mosseae hyphae was observed around simulated roots consisting of nylon, silk, polyamide and glass threads, whereas appressoria were formed on heterologous hyphae of VAM fungal species. The hypothesis that a purely thigmotropic stimulus could trigger hyphal attachment and the further differentiation of appressoria was excluded.
Giovannetti, Manuela; Avio, L; Sbrana, C; Citernesi, A. S.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/28265
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