砂仁不同叶位叶片的光合作用和氧化胁迫

被引：10

作者：

李志

冯玉龙

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昆明河北大学生命科学学院,保定,昆明河北大学生命科学学院,保定

来源：

植物生理与分子生物学学报 | 2004年 / 05期

关键词：

阳春砂仁; 老化; 衰老; 光合能力; 叶绿素; 荧光参数; 氧化胁迫;

D O I：

暂无

中图分类号：

Q945 [植物生理学];

学科分类号：

0903 ;

摘要：

衰老时砂仁叶片Pmax降低,这与叶片Gs、Ch1含量和可溶性蛋白质含量的降低有关。随着叶片的衰老,NPQ、AQY、Fv/Fm、φPSⅡ和qp均降低,热耗散减少,光抑制加剧,衰老后期出现光破坏。但这些参数下降的幅度均小于Pmax下降幅度。光暗反应失衡,活性氧生成增加。衰老初期（老化）叶片MDA含量没有升高,衰老中后期叶片MDA含量显著升高,表明老化叶片能有效地耗散或清除活性氧,衰老叶片则不能,尽管其SOD、APX和POD等抗氧化酶活力显著升高。上述结果表明砂仁叶片老化与氧化胁迫关系不大,衰老与氧化胁迫密切相关。

引用

页码：546 / 552

页数：7

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