Genome organisation and expression profiling of ABC protein-encoding genes in Heterobasidion annosum s.l. complex

Fungal Biology
Bikash BaralFred O Asiegbu

Abstract

Members of Heterobasidion annosum species complex are widely regarded as the most destructive fungal pathogens of conifer trees in the boreal and temperate zones of Northern hemisphere. To invade and colonise their host trees, Heterobasidion fungi must overcome components of host chemical defence, including terpenoid oleoresin and phenolic compounds. ABC transporters may play an important role in this process participating in the export of toxic host metabolites and maintaining their intracellular concentration below the critical level. We have identified and phylogenetically classified Heterobasidion genes encoding ABC transporters and closely related ABC proteins. The number of ABC proteins in the Heterobasidion genome is one of the lowest among analysed species of Agaricomycotina. Using quantitative RT-PCR, we have analysed transcriptional response of Heterobasidion ABC transporter-encoding genes to monoterpenes as well as their expression profile during growth on pine wood in comparison to the growth on defined media. Several ABC transporters were up-regulated during growth on pine wood. The ABC-transporter encoding gene ABCG1.1 was induced both during growth of H. annosum on pine wood and upon exposure to monoterpenes. Our...Continue Reading

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