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生态学杂志 ›› 2005, Vol. ›› Issue (3): 265-268.

• 研究报告 • 上一篇    下一篇

镉胁迫下玉米幼苗生理生态的变化

刘建新   

  1. 陇东学院生命科学系, 庆阳, 745000
  • 收稿日期:2003-09-19 修回日期:2004-03-04 出版日期:2005-03-10
  • 基金资助:
    陇东学院科研专项基金资助项目(SZN K0223)

Physiological and ecological responses of maize seedlings to cadmium stress

LIU Jianxin   

  1. Department of Life Science, Longdong University, Qingyang 745000, China
  • Received:2003-09-19 Revised:2004-03-04 Online:2005-03-10

摘要: 用不同浓度Cd2处理玉米种子,在室内常规培养,研究了种子萌发和幼苗生理生态的变化.结果表明,镉影响玉米种子的萌发和幼苗的生长.当Cd2浓度高于50 mg·l-1时,显著抑制种子的发芽率;随Cd2浓度的增加,根系长度和侧根数减小;在Cd2浓度小于5 mg·l-1时,镉刺激苗高和根系及地上部干物质量增加,当Cd2浓度超过相应浓度时,苗高和根系及地上部的生长量随Cd2浓度提高而降低.镉胁迫下幼苗根系活力和叶绿素含量明显降低,根内丙二醛含量增加.镉影响玉米幼苗对矿质元素的吸收.根系和茎叶中Ca、Mg、Fe、Cu的吸收量随Cd2浓度提高而增加,K、Zn的吸收量随Cd2浓度提高而减少.

关键词: 絮凝剂, 污水处理, 生态安全, 研究进展, 展望

Abstract: Maize seeds were soaked in solution with different concentration of cadmium (Cd2) and cultured routinely in doors.Germination of seeds and physiological and ecological responses of seedlings were studied.The results showed that Cd2 could affect germination of seeds and growth of maize seedling.Maize seed germination rate was inhibited when the concentration of Cd2was higher than 50 mg稬-1.With Cd2 concentration increase,main root length and lateral root number were decreased.Cd2could promote seedling height,dry matter weight of root and shoot when its concentration was lower than 5 mg稬-1.However,when the concentration was higher than 5 mg稬-1,inhibition effects could be observed,with the root activity and the content of chlorophyll reduced and malondialdehyde (MDA) content increased in root.Cd also affects the absorption of other mineral elements.For example,it could promote the absorption of Ca,Mg,Fe and Cu in root and shoot,and inhibit the absorption of K and Zn.

Key words: Flocculant, Wastewater treatment, Ecological safety, Researching advancement, Prospect

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