国产主要阔叶树材导管和纤维瘤状层的电镜观察和研究

对我国１８２种（４８科１３５属）阔叶树材导管和纤维壁的内表面进行扫描和透射电镜观察，其中５０种（隶１７科３２属）有瘤状层存在，其余不见或罕见。就这５０种木材的瘤状层有无及其形态和分布进行深入的观察与探讨。并对２种木材的超薄切片进行透射电镜观察和分析，认为瘤状物与次生壁的电子密度不同，说明两者化学成分不同。此外，还讨论了瘤状层的分布与穿孔板类型和在生长轮的位置关系。未发现瘤状层的出现和木质部进化趋势

STUDIES ON THE WARTY LAYER IN VESSEL ELEMENTS AND FIBRES OF MAIN CHINESE HARDWOOD BY ELECTRON MICROSCOPY

The presence or absence of warly layer in the vessel elements and fibres of 182 Chinese woody species from 135 genera belonging to 48 dicotyledonous families were examined using electron microscopy. Warly layers were found to be present in 50 species from 32 genera belonging to 17 families but absent in the remainder.Occurance or nonoccurance, distribution densities,sizes and shapes of the warts are of some value for the classification of families,genera and even species of hardwoods.The results of ultrathin wood sections of two species studied by TEM both revealed the differences between the warts and second walls in electron densities,i.e.the chemical composition difference between them. In addition, the relationship between warly layers and types of perforation and their positions in an annual ring was also discussed. But no significant relationship has been found between the occurance of warty layer and the evolution of xylem in this study.