摘要： 用透射电镜观察镉处理对冬小麦幼苗根端细胞超微结构的影响，结果表明，CdCl₂2.5H₂O浓度较低时（10×10⁶），可见被观察的细胞表现为核膜凹陷、胞核变形、染色质稍显凝聚；同样浓度下线粒体的超微结构未见明显变化。CdCl₂2.5H₂O浓度较高时（80×10⁶），则见细胞核膜破裂。崩解、染色质显著凝聚；线粒体内膜解体，嵴模糊或消失，表现为不可逆转性变化。

关键词: 冬小麦, 镉, 根端细胞, 超微结构变化

Abstract: The influence of cadmium on the ultrastructure of root tip cells in the winter wheat seedling was evaluated by transmission electron microscope. No marked structural changes in the mitochondria were observed at lower level of CdCl₂2.5H₂O lower (10×10-6). But under the same condition the nuclei deformed and the chromatin slightly condensed. As the concentration of cadmium increased, the most apparent structural changes induced by cadmium were remarkable in nuclei and mitochondria. The swelling and disruption of nuclei and mitochondria, were observed in the seedling exposed to 80×10^-6CdCl₂2.5H₂O. The chromatin excessively condensed and the cristae were indistinct or disappeared. The results indicated that the ultrastructural changes of root-tip cells of winter wheat seedling induced by high concentration of cadmium were non-reversible.

Key words: Winter wheats' eedling, Cadmium, Root-tip cells, Ultrastructural changes