不同云芝菌株腐朽杨木过程的扫描电镜研究

A scanning electron microscopy study on the rotting progression to poplar wood by three strains of white-rot fungus Coriolus versicolor

本文应用扫描电镜观察研究了白腐菌云艺（Coriolusvericolor）三个菌株腐朽杨木的过程，对试材的显微形态变化以及各菌株的降解特性进行了详细描述和探讨．实验结果表明，三个菌株降解木材的性能和方式存在着差异。NFU008对木质素和纤维素均具有很强的降解能力，它在腐朽早期优先降解胞间层中的木质素并能使纤维解离，在腐朽后期，它对纤维素产生强烈降解。NFU006对木质素和纤维素的降解是同时进行的，但对纤维次生壁中木质素的降解率明显高于对纤维素的降解率。NFU019降解木质素的能力相对较弱，但对纤维素的降解能力却很强，早期它以降解出生壁的木质素为主，而在腐朽后期它对纤维素产生剧烈降解。三个菌株最终均造成纤维细胞壁不同程度的减薄和破坏。

In this paper, the growth and attack patterns of three strains of white-rot fungus Coriolus versicolor NFU -006, NFU-008, NFU-019 and the micro-morphological changes in rotting wood (Populus deltoides) (emanated from attack by these organisms ) have been investigated by the aid of SEM.The results show that differences exist among these three strains. NFU-008 has great ability to degrade lignin and cellulose, and in the early stage, it preferentially degrades lignin of the compound middle lamella and causes separation of fibers.However, it produces serious degradation of cellulose in the later stage of decay.NFU-006 remove lignin and cellulose simultaneously, and the rate of degradation to lignin is higher than that to cellulose. NFU-019 has relatively lower ability to lignin degradation and has strong capability to degrade cellulose. It starts with preferential lignin degradation of cell walls followed by strong cellulose removal at later stage. All of the three strains can cause cell wall thinning and destroying in different degress finally.