Abstract
No information is presently available on the molecular mechanisms that control the morphogenesis of the truffle, an ectomycorrhizal ascomycetous fungus of great economic interest not only for forestry and agronomy but also for the organoleptic properties of its hypogeous fruitbodies. A Tilia platyphyllos- Tuber borchii model system was used in order to identify genes induced or up-regulated during symbiosis, since their isolation is a prerequisite for the understanding of the molecular bases of mycorrhizal development and regulation. The strategy applied involved the construction of an ectomycorrhizal cDNA library and random selection of clones, followed by a differential screening procedure to analyse cDNA expression in uninfected roots, ectomycorrhizae and free-living mycelia. The results revealed that many genes - and more plant genes than fungal genes - are expressed at higher levels during the symbiotic phase. Several clones were also investigated in order to understand their biological function. This study represents the first attempt to extend our knowledge of the molecular mechanisms underlying the establishment of ectomycorrhiza in Tuber species.
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