塑料醌
化学
光化学
光系统II
DCMU公司
电子受体
接受者
电子传输链
700页
光系统I
电子转移
绿色植物采光复合体
异丙基
叶绿体
光合作用
药物化学
类囊体
生物化学
物理
基因
凝聚态物理
作者
Jane M. Bowes,Antony R. Crofts
标识
DOI:10.1016/0003-9861(81)90329-5
摘要
Measurements of chlorophyll fluorescence have been used to monitor electron transport from the primary electron acceptor of photosystem II, Q, to the secondary acceptor, B, in chloroplasts in either the presence or the absence of the plastoquinone analog 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB). Electron transport is markedly slower from Q− to either B or B− in the presence of DBMIB. Binary oscillations in the rate of reoxidation of Q− (equivalent to the reactions Q−B → QB− and Q−B− → QB2−) after each of a series of flashes were of a phase opposite to those observed in the absence of DBMIB (J. M. Bowes, and A. R. Crofts, (1980) Biochim. Biophys. Acta590, 573–584). The results confirm that inhibition of electron transport by DBMIB in chloroplasts is not restricted to an inhibition of electron transfer from the plastoquinone pool, but that there is also a specific interaction between the reduced form of the inhibitor and the secondary electron acceptor B. Models are discussed to account for the mechanism of this interaction.
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