Host and cell type affect the mode of degradation by Meripilus giganteus

摘要: SUMMARY Wood degradation by the white-rot basidiomycete Meripilus giganteus (Pers.: Pers.) Karst. was studied in naturally infected and artificially inoculated wood of beech (Fagus sylvatica L.) large-leaved lime (Tilia platyphyllos Scop.). Semi-thin sections revealed that secondary walls most fibres contained internal cavities. Three distinct types cavity formation, which differed not only between hosts, but also cell type location annual ring, were identified. Within discoloured beech, structure cavities their formation associated hyphae reminiscent a soft-rot. By contrast, from soft-rot mode attack as extensive delignification always preceded neither T-branching, L-bending, nor hyphal growth found within walls. The half-moon shaped present tension-wood fibres. From large diameter hyphae, growing fibre lumen, numerous fine perforation extended transversely via helical cracks into wall. Subsequent cellulose concentric layers commenced apices hyphae. Sections stained with ruthenium red hydroxlamine-ferric chloride, M. preferentially degrades pectin-rich regions middle lamellae xylary ray cells. In lime, such uniformly located axial parenchyma. wood, after resulted conspicuous hollowing multiseriate xylem rays. Plasticity modes reflects variations wall and/or prevailing conditions.