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Trametes gibbosa by Christophe Lecuru, Université Lille 2, France
Trametes gibbosa by Christophe Lecuru, Université Lille 2, France

This genome was sequenced as part of the JGI CSP “Survey of the lignocellulolytic capabilities over the order Polyporales” project. Within Agaricomycotina, the order Polyporales is the major group of wood decayers in temperate and tropical forests. As such, Polyporales have a pivotal role in the global carbon cycle. Lignocellulose is the principal carbon storage on the emerged land. Lignin degradation by white-rot fungi provides access to the polysaccharides that can thereby be used as a source of carbon or energy by other microorganisms. On the contrary, brown-rot fungi leave behind inert residual lignin and participate to carbon long-term storage in soils.

Because they are able to totally degrade lignin from wood, white-rot filamentous fungi have a high potential for biotechnological processes, particularly for lignocellulosic feedstock biorefinery applications. Lignocellulose is a high potential renewable resource for the production of biofuels and chemicals, including high-value chemicals, from biomass. Notably, complex raw materials from different origins (dedicated crops, agricultural wastes, silviculture, etc.) that do not compete with food production constitute new sources of sugars that can be fermented for production of bioethanol.

Beyond research on lignocellulose modifying enzymes amenable to biotechnological applications, the genomic survey of Polyporales provides data for comparative genomics and research on fungal biology, fungus adaptation to the environment and for phylogenomics investigations.

Trametes gibbosa (Pers.: Fr.) Fr. is representative of temperate species included in the core genus Trametes. Complementation assays of Trichoderma reesei enzymatic cocktails have shown interesting enzymatic properties for strain a T. gibbosa strain (Berrin et al., Appl Environ Microbiol 2012). In addition, the T. gibbosa strain displayed higher activity on crystalline cellulose than T. reesei commercial enzymatic cocktails.

T. gibbosa is generally found on hardwood, specially fallen trunks and stumps, with a preference for beech. It has also been observed on hazelnut tree, Laburnum, Ulmus, Populus, hornbeams and maple. It is largely distributed throughout Europe (Bernicchia A., Fungi Europeai, Polyporaceae, Candusso Ed., 2005).