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Cesaro Patrizia

Università del Piemonte Orientale, Italy

Title: Effects of common hyphal network in tomato plants during the early stages of arbuscular mycorrhizal symbiosis


Biography: Cesaro Patrizia


Arbuscular mycorrhizae represent the most common type of plant symbiosis. It is commonly considered mutualistic; however, considering that the interactions between organisms can change during their life cycle, a more correct interpretation describes it as a continuum between mutualism and parasitism. The arbuscular mycorrhizal (AM) fungus, belonging to the phylum Glomeromycota, supplies nutrients to the host plant and in return it receives photosynthates to complete its life cycle. Numerous evidences suggest that this symbiosis can modify different plant physiological aspects. AM fungi are generally inoculated as mixtures of spores and root colonized fragments. In these conditions, hyphae or germinating spore tubes present in the inoculum colonize the roots of the germinated seedling and the fungus does not yet have a dense hyphal network to absorb water and minerals. Until the fungus reaches full development, the extra-radical mycelium is built only at the expense of the carbon provided by the plant. Conversely in natural conditions the colonization of the fungus is often carried out starting not only from the spores, but also from the extraradical hyphae of the fungi linked to other mycorrhizal plants, that form a dense network called Common Mycorrhizal Network (CMN). Under these conditions the fungus already has a large hyphae network capable of receiving the carbon that it needs from the plants previously colonized.