砂仁叶片光破坏的防御

被引:42
作者
冯玉龙
冯志立
曹坤芳
机构
[1] 中国科学院西双版纳热带植物园昆明分部,中国科学院西双版纳热带植物园昆明分部,中国科学院西双版纳热带植物园昆明分部昆明河北大学生命科学学院,保定,昆明,昆明
关键词
叶绿素荧光; 光抑制; 叶黄素循环; 卷叶; PSII反应中心可逆失活; 砂仁;
D O I
暂无
中图分类号
Q945.78 [协迫生理学]; S567.239 [];
学科分类号
摘要
报告了生长于热带林窗向阳处砂仁叶片叶绿素荧光参数的日变化 ,及阻止卷叶和用二硫苏糖醇(DTT)处理对它的影响。受强光照射 ,砂仁叶片迅速卷起。在雾天上午光强还相当弱 (低于 10 0 μmolm-2s-1)时 ,砂仁叶片就发生光抑制 ,中午最重 ,下午当光强减弱时 ,光抑制逐渐得到缓解。其热耗散 ( qN、NPQ)随光强的升高而增加 ,且下午仍在缓慢增加。阻止卷叶使强光下砂仁叶片光抑制加剧 ,Fo、NPQ升高。DTT处理也使光抑制加剧 ,Fo 升高 ,且使PSII反应中心发生可逆失活。夜间 2 3∶0 0各处理的荧光参数基本恢复。卷叶、叶黄素循环和PSII可逆失活 3种保护机制在同种植物中依次启动的现象尚属少见。
引用
收藏
页码:483 / 488
页数:6
相关论文
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