Journal Article

Tuber aestivum and Tuber uncinatum: two morphotypes or two species?

Topini, Fabiana, Arcioni, Sergio, Paolocci, Francesco, Riccioni, Claudia, Rubini, Andrea

2004

Overview

Tuber spp. are ectomycorrhizal fungi that establish symbioses with shrubs and trees. Because of their different smell and taste, Tuber uncinatum and Tuber aestivum are two truffle morphotypes with a different market value, but whether or not T. uncinatum and T. aestivum are different taxa is still an open debate among mycologists. In order to identify molecular keys characterizing both T. aestivum and T. uncinatum morphotypes, ITS/RFLPs analyses were carried out on a large collection of samples from all over Italy and from other European countries, followed by a study of the phylogenesis of ITS, β-tubulin and EF 1- genes, on representative samples. The present study provides compelling evidence that: (i) T. uncinatum and T. aestivum belong to the same species, (ii) neither morphotype presents a specific molecular fingerprint, but they may even share identical alleles at any of the loci analysed; (iii) T. aestivum is most likely under a selfing reproductive mode. Our findings suggest that ecological, rather than genetic causes may account for differences in sporal morphology, taste and smell between T. aestivum and T. uncinatum truffles.

• Publisher: Blackwell Publishing Ltd,Blackwell,Oxford University Press
• Subject: Ascomycota - classification / Ascomycota - cytology / Ascomycota - genetics / Biological and medical sciences / chemotaxonomy / DNA, Fungal - analysis / Ecological effects / ectomycorrhizae / Ectomycorrhizas / EF 1‐α / fruiting bodies / Fundamental and applied biological sciences. Psychology / fungal anatomy / Fungi / Gene genealogy / Haplotypes / ITS / ITS/RFLP / Market value / Microbiology / Miscellaneous / Morphology / Mycology / Olfaction / Peptide Elongation Factor 1 - genetics / Polymerase Chain Reaction / Polymorphism, Restriction Fragment Length / Sequence Analysis, DNA / Shrubs / Smell / Spores, Fungal - cytology / Symbiosis / Taste / truffles / truffles (edible fungi) / Tuber (genus) / Tuber aestivum / Tuber spp / Tuber uncinatum / Tubulin / Tubulin - genetics / β‐Tubulin