桃缩叶病组织的光学和电子显微镜观察

光学显微镜和电子显微镜观察发现,感染桃缩叶病的碧桃叶片的厚度,细胞的层数和细胞的直径都大于健康叶片;感病叶片的栅栏组织随症状发展而消失;叶肉细胞内的叶绿体数明显减少,并且有的细胞内则无叶绿体,表现症状的叶肉均有菌丝的分布。以上结果表明桃缩叶病引起的畸形主要是由于叶肉细胞不规律增殖造成,叶绿体的减少消失是病叶失绿的直接原因,这些病变都与菌丝的扩展密切相关。

Light and Electron Microscopy Observation of Leaf Curl Disease of Peach Caused by Taphrina Deformans

The results from light and electron microscopy observation showed that the number of cell layers, cell diameter and depth of peach leaves infected by Taphrina deformans were greater than those of health leaves, and the palisade cells in infected leaves disappeared with the symptom developing. The chloroplasms in cell decreased, and even there was no chloroplasm in some cells. The place with symptom on the infected leaves all contained hyphae. The results indicated that the malformation of diseased peach leaves was caused by irregular reproduction of host-cell, and the chlorosis of diseased leaves was due to decrease and disappearance of chloroplasms in host cell. Those pathologic change in host were closely associated with hyphal spread in leave.