【摘要】 通过超薄切片的电镜观察,在木麻黄丛枝病病枝的筛管及伴胞中发现类菌原体,在木质部薄壁细胞发现类立克次细菌、类菌原体多态形,大小为45～300nm,单位膜厚约7.5nm;类立克次细菌多态型,大小为114～762nm×1000～1760nm,膜壁厚22～28nm。并观察到菱纹叶蝉的唾腺中存在类菌原体;短头叶蝉唾腺中存在类立克次细菌。在健株组织中没有发现任何病原体。更多还原

【Abstract】 An electron-microscopic study of Witches′broom diseased Casuarinaequisetifolia was made.Mycoplasma-like organism(MLO)in the sieve ele-ments and it′s companion cells,and rickettsia-like bacterium in the xy-lem cells of the diseased tissues were observed.The MLO was polymorphicand was spherical,oval or irregular in shape.It′s diameter ranged from45 to 300 nm and its trilamiar unit membrane was about 7.5nm thick.The RLB was usually a rod-shaped cell and 114 to 762nm wide by 1000to 1760 nm long with a well defined cell wall about 22 to 28 nm in thick-ness.The MLO and RLB were also observed in the salivary glands ofHishirnonus sp.and of Bythoscopus sp.respectively.Neither MLO norRLB was found in healthy tissues.更多还原