700页
系统间交叉
光化学
光系统I
叶绿体
化学
生物物理学
电子
电子受体
电子供体
光合作用
叶绿素荧光
电子传输链
氧化还原
光系统II
生物
生物化学
物理
无机化学
单重态
量子力学
基因
催化作用
激发态
核物理学
作者
Kozi Asada,U. Heber,Ulrich Schreiber
出处
期刊:Plant and Cell Physiology
[Oxford University Press]
日期:1993-01-01
被引量:35
标识
DOI:10.1093/oxfordjournals.pcp.a078398
摘要
The functional pool size of electrons in the intersystem chain of the chloroplasts of maize was estimated to be about 25 per P700 by the redox change in P700 with single- and multiple-turnover lights under far-red light in intact leaves. This is about twice the pool size observed in C3 plants. Furthermore, the stromal pool size of electrons that can be donated to P700+ after actinic illumination was larger in maize leaves than in leaves of C3 plants, giving a maximum value of 225 electrons per P700. Maize leaves showed an increase in the yield of modulated Chl fluorescence after turning off of actinic light, which confirms the donation of electrons in the dark to the intersystem chain from the stromal donors that accumulated during actinic illumination. We propose that the mesophyll chloroplasts are responsible for a high level of electron-donating activity to the intersystem chain from stromal donors such as triose phosphates and malate with NADPH as an intermediate. The level of P700+ under strong far-red light was decreased after actinic illumination, suggesting the operation of an actinic light-triggered cyclic electron flow in chloroplasts of the bundle sheath cells.
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