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首页> 外文期刊>International Biodeterioration & Biodegradation >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
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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

机译：云杉和灰边材被褐腐真菌Postia Placenta降解的超微结构和免疫细胞化学：衰减的初期阶段和衰减过程中的变化的表征

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Aspects of the degradation of non-cellulosic polysaccharides (pectins, hemicelluloses) in spruce and ash sapwood by the brown rot fungus Postia placenta was investigated using transmission electron microscopy coupled with immunocytochemistry. Degradation of non-cellulosic polysaccharides and changes in ultrastructure were initiated in the compound middle lamella (CML)/middle lamella cell corner (MLcc) regions of xylem cells; sites that were remote from hyphal colonization in the cell lumen. Degradation of the S-3 layer was also detected in both wood species at early stages of decay. Apart from early stages of attack, the degradation patterns differed greatly between spruce and ash. Spruce showed three patterns of hemicellulose degradation in the secondary cell walls of tracheids, while ash showed a single pattern in fibers. Spruce parenchyma cells also showed lower resistance to decay than tracheids, whereas ash parenchyma. cells showed higher resistance than fibers. Together, degradation of xylem cells by P. placenta differs between spruce (softwood) and ash (hardwood) even though they show similar initial degradation in CML/MLcc regions and the S-3 layer. The overall degradation patterns observed, particularly in spruce differ from previous ideas and generally accepted decay patterns produced by brown rot fungi in wood. (C) 2015 Elsevier Ltd. All rights reserved.
机译：利用透射电镜结合免疫细胞化学技术研究了褐腐真菌Postia Placenta对云杉和灰边材中非纤维素多糖（果胶，半纤维素）的降解作用。在木质部细胞的复合中间层（CML）/中间层细胞角（MLcc）区域引发了非纤维素多糖的降解和超微结构的改变。细胞腔中远离菌丝定植的位点。在腐烂的早期，两种木材中都检测到了S-3层的降解。除了侵袭的早期阶段，云杉和灰烬的降解方式也有很大差异。云杉在气管的次生细胞壁上显示出半纤维素降解的三种模式，而灰分在纤维中显示出单一模式。云杉薄壁细胞也显示出比气管更低的抗腐烂能力，而灰薄壁薄壁细胞则表现出更低的抗性。细胞显示出比纤维更高的抵抗力。一起，即使在CML / MLcc区域和S-3层中显示出相似的初始降解，云杉（软木）和白蜡木（硬木）对胎盘衣原体木质部细胞的降解也有所不同。观察到的整体降解模式，特别是云杉，与先前的想法不同，并且是木材中褐腐真菌产生的公认的衰减模式。 （C）2015 Elsevier Ltd.保留所有权利。

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