Effects of Water Stress on the Mssbauer Spectrum of Fe^(2+) /Fe^(3+) Components in Cucumber PSⅡ Particles  

干旱胁迫对黄瓜PSⅡ颗粒铁组分Mssbauer谱的影响(英文)

作　　者：曾福礼[1] 吴劲松 张丽静 王建波[2] 周荣洁 张明凤[3] 

机构地区：[1]兰州大学生物系,兰州730000 [2]兰州大学物理系,兰州730000 [3]兰州大学化学系,兰州730000

出　　处：《Acta Botanica Sinica》2000年第5期467-470,共4页Acta Botanica Sinica（植物学报：英文版）

基　　金：TheNationalNaturalScienceFoundationofChina!(3 9670 0 73 )

摘　　要：There were four doublets in the Mssbauer spectrum of cucumber (Cucumis sativus L.) photosystemⅡ (PSⅡ) particles. According to the value of isomer shift and quadrupole splitting, they represented oxidized cytochrome b559 (Cyt_b559), reduced Cyt_b559, Fe 3+ _quinone (Q) complex, and Fe 2+ _Q complex respectively. After water_stress, the electron transport rate between Q A (primary quinone electron acceptor of PSⅡ)/Q B(secondary quinone electron acceptor of PSⅡ) was affected and the absorption doublets of Fe 2+ disappeared, suggesting that the reduced Cyt_b559 and Fe 2+ _Q complex had been oxidized. The results indicated that water_stress had changed the redox status of iron in the iron_quinone complex. Iron took part in electron transport through the change from a state of reduction to oxidation.黄瓜 (CucumissativusL .)叶片PSⅡ颗粒的M ssbauer谱呈现 4套双峰 ,依它们的化学位移和四极矩劈裂数值 ,分别属于氧化态Cyt_b5 5 9、还原态Cyt_b5 5 9、Fe3 + _Q复合物和Fe2 + _Q复合物。干旱胁迫影响QA/QB 中铁 (Fe)参与电子传递的速率 ,使PSⅡ颗粒的M ssbauer谱中Fe2 + 的吸收双峰消失 ,即还原态Cyt_b5 5 9转变为氧化态Cyt_b5 5 9,Fe2 + _Q复合物转变为Fe3 + _Q复合物。结果干旱胁迫改变了铁醌复合物中的铁存在状态 ,使铁具有氧化_还原态变化 ,从而参与电子传递。

关 键 词：CUCUMBER PSⅡ particles Mssbauer spectrum Fe-quinone complex water stress 

分 类 号：Q945.78[生物学—植物学]