Chemotropism in the arbuscular mycorrhizal fungus Glomus mosseae

In this work, we report the occurrence of chemotropism in the arbuscular mycorrhizal (AM) fungus Glomus mosseae. Fungal hyphae were able to respond to host-derived signals by reorienting their growth towards roots and to perceive chemotropic signals at a distance of at least 910 microm from roots. I...

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Bibliographic Details
Published in:Mycorrhiza 2005-11, Vol.15 (7), p.539-545
Main Authors: Sbrana, C, Giovannetti, M
Format: Article
Language:English
Subjects:
Biological and medical sciences
chemotropism
Eruca sativa
Fundamental and applied biological sciences. Psychology
Fungi
Glomus mosseae
Host plants
host specificity
hyphae
Hyphae - growth & development
Medicago sativa
Mycorrhizae - growth & development
Mycorrhizae - physiology
mycorrhizal fungi
Ocimum basilicum
Parasitism and symbiosis
plant growth
Plant physiology and development
Plant Roots - metabolism
Roots
signal transduction
Symbiosis
Symbiosis - physiology
Tropism
Vaccinium myrtillus
vesicular arbuscular mycorrhizae
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Summary:In this work, we report the occurrence of chemotropism in the arbuscular mycorrhizal (AM) fungus Glomus mosseae. Fungal hyphae were able to respond to host-derived signals by reorienting their growth towards roots and to perceive chemotropic signals at a distance of at least 910 microm from roots. In order to reach the source of chemotropic signals, hyphal tips crossed interposed membranes emerging within 1 mm from roots, eventually establishing mycorrhizal symbiosis. The specificity of chemotropic growth was evidenced by hyphal growth reorientation and membrane penetration occurring only in experimental systems set up with host plants. Since pre-symbiotic growth is a critical stage in the life cycle of obligate AM fungal symbionts, chemotropic guidance may represent an important mechanism functional to host root location, appressorium formation and symbiosis establishment.
ISSN:0940-6360
1432-1890
DOI:10.1007/s00572-005-0362-5