Cd2+胁迫对石龙尾超微结构的影响

Effect of Cd2+ stress on ultrastructure of Limnophila sessiliflora

关键词:  Cd²⁺  石龙尾  超微结构

Key words:  Cd²⁺  Limnophila sessiliflora  ultrastructure

摘要:

以在不同浓度梯度Cd²⁺溶液中培养48 h的石龙尾为实验材料,用透射电镜观察叶细胞超微结构的损伤,结果表明:Cd²⁺浓度越高,超微结构的损伤越严重。表现为核糖体数目减少; 高尔基体膨胀或消失; 线粒体出芽或破裂; 质膜收缩产生质壁分离,胞间连丝断裂; 叶绿体膨胀,类囊体解体,进而影响了细胞的整体功能,造成细胞损伤乃至死亡。

Abstract:

Limnophila sessiliflora was cultivated in water medium polluted with Cd²⁺ of different gradient concentration for 48 h. The ultrastructural damages of leaf cells were observed by using transmission electron microscopy. The results showed:The higher concentration of Cd²⁺,the more serious the damage to ultrastructure. Ribosomes reduced,golgi apparatus slacked or disappeared,mitochondria ruptured or budded,plasma membrane contracted and plasmolysis took place,plasmodesma snapped,chloroplasts swelled and thylakoids disintegrated. These affected the function of cells in all and finally led to the cell damaged or destroyed.