Ultrastructure and immunocytochemistry of degradation in spruce and ash sapwood by the brown rot fungus Postia placenta: Characterization of incipient stages of decay and variation in decay process

摘要: Aspects of the degradation non-cellulosic polysaccharides (pectins, hemicelluloses) in spruce and ash sapwood by brown rot fungus Postia placenta was investigated using transmission electron microscopy coupled with immunocytochemistry. Degradation changes ultrastructure were initiated compound middle lamella (CML)/middle cell corner (MLcc) regions xylem cells; sites that remote from hyphal colonization lumen. S3 layer also detected both wood species at early stages decay. Apart attack, patterns differed greatly between ash. Spruce showed three hemicellulose secondary walls tracheids, while a single pattern fibers. parenchyma cells lower resistance to decay than whereas higher Together, P. differs (softwood) (hardwood) even though they show similar initial CML/MLcc layer. The overall observed, particularly differ previous ideas generally accepted produced fungi wood.