Heterogeneity in chloroplast photosystem II |
| |
Authors: | Michael T Black Trevor H Brearley Peter Horton |
| |
Institution: | (1) Research Institute for Photosynthesis, University of Sheffield, S10 2TN Sheffield, UK;(2) Department of Biochemistry, University of Sheffield, S10 2TN Sheffield, UK |
| |
Abstract: | Photosystem-two (PSII) in the chloroplasts of higher plants and green algae is not homogeneous. A review of PSII heterogeneity is presented and a model is proposed which is consistent with much of the data presented in the literature. It is proposed that the non-quinone electron acceptor of PSII is preferentially associated with the sub-population of PSII known as PSIIß.Abbreviations and symbols ATP
Adenosine triphosphate
- Chl
Chlorophyll
- C550
Absorbance bandshift at 550 nm; proportional to QA
-]
- D, D
Components involved ir electron donation to P680
- pH
Transthylakoid proton gradient
- ![Delta](/content/b32521035268lt85/xxlarge916.gif)
Transthylakoid electrical gradient
- DCMU
3-(3,4-Dichlorophenyl)-1,1 -dimethylurea referred to as diuron
-
E
h
Oxidation-reduction potential
-
E
m
Cxidation-reduction midpoint potential
- EPR
Electron paramagnetic resonance
- Fm
Fluorescence yield when all traps are closed
- Fo
Fluorescence yield when all traps are open
- Fv
Variable fluorescence equal to Fm-Fo
- Fi
Initial fluorescence yield, (usually equivalent to Fo in dark-adapted thylakoids)
- Hepes
2-hydroxyethylpiperazine-N -2-ethane sulphonic acid
- LHCP
Light-harvesting chlorophyll a/b binding protein
- PQ
Plastoquinone
- PSII
Photosystem II
- P680
Reaction centre chlorophyll of PSII
- P518
Absorbance bandshift at 518 nm, reflects asymmetric charge distribution across the thylakoid membrane
- QA, QH
, Q1
Primary stable plastoquinone electron acceptor of PSII; a quencher of fluorescence
- Q
B
, B, R
Plastoquinone associated with the Q
B
-protein, the two-electron gate
- Q
D
, Q2, X
a
Non-quinone electron acceptor of PSII
- X320
Absorbance bandshift at 320 nm; semiquinone anion indicator |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|