Abstract
The effect of iron deficiency on photosynthetic electron transport in Photosystem II (PS II) was studied in leaves and thylakoid membranes of lettuce (Lactuca sativa, Romaine variety) plants. PS II electron transport was characterized by oxygen evolution and chlorophyll fluorescence parameters. Iron deficiency in the culture medium was shown to affect water oxidation and the advancement of the S-states. A decrease of maximal quantum yield of PS II and an increase of fluorescence intensity at step J and I of OJIP kinetics were also observed. Thermoluminescence measurements revealed that charge recombination between the quinone acceptor of PS II, QB, and the S2 state of the Mn-cluster was strongly perturbed. Also the dark decay of Chl fluorescence after a single turnover white flash was greatly retarded indicating a slower rate of QA − reoxidation.
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Abbreviations
- Chl:
-
Chlorophyll
- DCBQ:
-
2,6-Dichlorobenzoquinone
- DCIP:
-
2,6-Dichlorophenolindophenol
- DCMU:
-
3-(3′,4′-Dichlorophenyl)-1,1-dimethylurea
- DBMIB:
-
2,5-Dibromo-3-methyl-6-isopropyl-p-benzoquinone
- FI:
-
Chlorophyll fluorescence induction
- F 0 :
-
Basal level of chlorophyll fluorescence
- F m :
-
Maximal level of chlorophyll fluorescence
- F v :
-
Variable chlorophyll fluorescence
- OEC:
-
Oxygen evolving complex
- P680:
-
Primary electron donor of photosystem II
- Pheo:
-
Pheophytin
- PS:
-
Photosystem
- PQ:
-
Plastoquinone
- QA and QB :
-
Primary and secondary quinone acceptors of photosystem II
- RC:
-
Reaction center
- LHC:
-
Light-harvesting complex
- TL:
-
Thermoluminescence
- T m :
-
Temperature maximum of thermoluminescence emission
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This study was supported by Natural Sciences and Engineering Research Council of Canada (NSERC).
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Msilini, N., Zaghdoudi, M., Govindachary, S. et al. Inhibition of photosynthetic oxygen evolution and electron transfer from the quinone acceptor QA − to QB by iron deficiency. Photosynth Res 107, 247–256 (2011). https://doi.org/10.1007/s11120-011-9628-2
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DOI: https://doi.org/10.1007/s11120-011-9628-2