质体醌在两个光系统激发能分配中的功能  

THE ROLE OF PLASTOQUINONE IN ENERGY DISTRIBUTTON OF TWO PHOTOSYSTEMS

作　　者：蒯坚平 张正东[1] 马桂芝[1] 李良璧[1] 古练权[1] 周佩珍[1] 

机构地区：[1]中国科学院植物研究所光合研究室

出　　处：《生物物理学报》1989年第1期39-44,共6页Acta Biophysica Sinica

基　　金：国家自然科学基金

摘　　要：用非极性有机溶剂正己烷抽提菠菜类囊体膜,Mg^(2+)调节激发能在两个光系统间的分配效率降低:向抽提过的类囊体膜加入人工合成的PQ类似物PQ_2,有部分恢复Mg^(2+)对能量分配的调节作用,但对类囊体膜表面静电性质不产生影响.向非抽提的类囊体膜加入二溴百里香醌(DBMIB),一种抑制PQ氧化的抑制剂,同样发现DBMIB抑制Mg^(2+)调节激发能分配的效率,但对类囊体膜表面静电性质也不发生影响.以上实验结果表明,PQ对Mg^(2+)诱导激发能在两个光系统间的分配具有调节作用.这种调节作用不依赖于类囊体膜的表面电荷变化,而与PQ的氧化还原状态密切相关.Plastoquinone was extracted from the lyophilized spinach thyla-koid with hexane. The Mg+2 regulating excitation energy distribution effect was lost. However the activity could be partly restored by addition of PQ2. At the presence of DBMIB the change of Mg+2 induced fluorescence emission spectra at 77 K was diminished. But the rate of electrophoresis mobility of thylakoid par ticle was found to be unchanged.The above evidence supports that plastoquinone has a control function on the Mg+2 regulating excitation energy distribuion effect and it is independ on the surface charge of thylakoid.

关 键 词：质体醌 光系统 激发能 分配 

分 类 号：Q945.11[生物学—植物学]