摘要
水分胁迫可降低小麦叶绿体的室温荧光产量和Ｍｇ２＋ 在两个光系统间的调节能力、叶片的可变荧光产量、可变荧光猝灭速率以及荧光上升互补面积，表明光系统Ⅱ受到了伤害。光系统Ⅱ氧化侧的人工电子供体ＤＰＣ能部分恢复受到抑制的叶绿体可变荧光，说明水分胁迫对光系统Ⅱ的损伤部位不仅位于氧化侧。
The fluorescence yield at room temperature, the capacity of excitation energy distribution between photosystem Ⅰ and Ⅱ by Mg 2+ , variable fluorescence yield, variable fluorescence quenching rate and fluorescence complementary area were decreased under water stress. These indicated that photosystem Ⅱ was impaired. The inhibited variable fluorescence yield could be partly recovered by the addition of artificial electron donor DPC. Therefore, water stress inhibited not only the oxidizing site of photosystem Ⅱ but also impaired partly the reaction center of photosystem Ⅱ.
关键词
小麦
水分胁迫
光合系统
Wheat
Water stress
Photosystem Ⅱ
Damage site
