Heterobasidion - conifer pathosystem

摘要: In this thesis the Heterobasidion – conifer pathosystem is discussed in a symbiosis context. annosum (Fr.)Bref. s.l. species complex with closely related partly overlapping host range. There are three European species, H. annosum, abietinum and parviporum. first study it was shown that cDNA arrays printed for one can be used to gene expression other species. grow both as saprotroph on dead wood or kill its necrotroph. This possibility switch nutritional mode has impact forest management prevail old decades until infecting next generation of trees. Gene patterns during transition from saprotrophic necrotrophic growth were studied nutrient limited microcosm system living Pinus sylvestris seedlings connected by common mycelium. These results compared Phanerochaete chrysosporium (saprotroph) Paxillus involutus (mutualist) growing rich systems. comparison higher correlation found, than between where no differentially expressed genes identified. However differences found when annotated into functional categories KOG groups. suggests two modes might depend magnitude rather distinct qualitative differences. The specificity mycorrhiza-associated (similar Clavata 1 MtN21) known auxin-induced defence through early signalling ECM development without auxin transport inhibitor TIBA further investigated. Clv-1-like seems associated lateral root formation since detected primordia mycorrhizal roots.