陈华;林淑玲;沈浩;

• 1:中国科学院华南植物园
• 2:耀华中学
• 3:广州大学

摘要(Abstract)：

[目的]薇甘菊(Mikania micrantha)不同叶位对田野菟丝子(Cuscuta campestris Yuncker)的寄生行为会产生不同的寄生效应。[方法]连续3d从野外取样,采用叶绿素成像技术和分光光度计,测定寄生影响。[结果]寄生显著降低了薇甘菊第4、5片叶PSⅡ的最大光化学效率(Fv/Fm),对低光诱导下的qP和NPQ均无显著影响,却显著降低了第8、9片叶子的光合电子传递相对速率(ETR)。寄生也改变了寄主叶片的均质性。寄生非显著地降低了寄主薇甘菊第4～9片叶的叶绿素总量和类胡萝卜素含量,显著地降低了第6、7、9片叶的叶绿素a/b值。田野菟丝子茎内的色素含量均非常低,叶绿素a/b却保持与寄主薇甘菊相似的水平。[结论]田野菟丝子的寄生对寄主产生的胁迫直接影响寄主的光化学中心的活性,从而影响其光合进程。

关键词(KeyWords)： 荧光参数;叶绿素成像技术;色素构成

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(30470345);; 广东省自然科学基金重点项目(021536)

作者(Author): 陈华;林淑玲;沈浩;

Email:

DOI: 10.13989/j.cnki.0517-6611.2010.30.098

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