Oxygenated lanostane-type triterpenes profiling in laccate [i]Ganoderma chemotaxonomy[/i]

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Welti, Stephane | Moreau, Pierre-Arthur | Decock, Cony | Danel, Cécile | Duhal, Nathalie | Favel, Anne | Courtecuisse, Regis

Edité par CCSD ; Springer Verlag -

Oxygenated lanostane-type triterpenes (OLTT), including ganoderic acids and lucidenic acids produced by fungi of the genus Ganoderma (Polyporales), are abundantly documented for their potential pharmacological value. In order to test the correlation between species identity and OLTT composition, methanolic extracts of seven laccate Ganoderma species were analyzed by liquid chromatography coupled to mass spectrometry. OLTT profiles of each species were compared to a phylogenetic reconstruction of Ganoderma based on ITS rDNA sequences. The results suggest a high specificity in OLTT composition in one of the phylogenetic lineages of Ganoderma that encompasses tropical species, when no OLTT compound was detected in other lineages (including the European G. lucidum and the Asian G. sinense). Within the OLTT-positive lineage, G. sichuanense, G. martinicense, and G. tuberculosum (Asian-tropicum clade) were characterized by a specific composition in ganoderic acids and G. curtisii by a variety of lucidenic acids. An unidentified OLTT was found in G. resinaceum, also equivocally positioned in phylogenetic analyses. These results confirm OLTT as a suitable taxonomic marker in a lineage of pharmacologically and economically valuable species. Correlations with phylogeny, and development of OLTT composition as a fingerprint tool for quality control, could be an issue to address next, based on a more complete species sampling.

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