摘要： 水培条件下研究不同浓度Cd²⁺胁迫对玉米幼苗生长、叶绿素含量和细胞超微结构的影响。结果表明:低浓度Cd²⁺(10^-6mol/L)对玉米幼苗生长、叶绿素含量、叶绿体超微结构没有明显影响;当Cd²⁺浓度达到10^-5mol/L时,幼苗生长及叶绿素含量均明显降低,叶绿体膨大,类囊体排列不规则,根细胞的膜系统破坏明显;高浓度Cd²⁺(10^-4mol/L)处理后,玉米幼苗生长受到明显抑制,细胞器损伤严重甚至解体。简要讨论Cd²⁺毒害的作用机理。

关键词: 镉, 玉米, 叶绿素, 超微结构

Abstract: The effects of different concentrations of Cd²⁺ on seedling growth, chlorophyll contents and ultrastructures in maize were investigated using water culture method.The results indicated that the growth, chlorophyll contents and ultrastructures were not obviously affected at low concentration of Cd²⁺ ( 10^-6 mol/L).At 10^-5 mol/L Cd²⁺, the growth and chlorophyll contents decreased, swollen chloroplasts and irregular thylakoid were found in some leaves cells.In root cells, cell membrane systems were damaged significantly.At higher concentration of Cd²⁺ ( 10^-4 mol/L), the seedling growth was inhibited significantly.Some cellular organelles were damaged seriously, and even led to cell disintegration in root cells.The mechanism of Cd²⁺ toxicity was briefly discussed．

Key words: Cadmium, Maize, Chlorophyll, Ultrastructure

中图分类号: 

• Q945.78