Abstract
Photosynthetic complexes in the thylakoid membrane of plant leaves primarily function as energy-harvesting machinery during the growth period. However, leaves undergo developmental and functional transitions along aging and, at the senescence stage, these complexes become major sources for nutrients to be remobilized to other organs such as developing seeds. Here, we investigated age-dependent changes in the functions and compositions of photosynthetic complexes during natural leaf senescence in Arabidopsis thaliana. We found that Chl a/b ratios decreased during the natural leaf senescence along with decrease of the total chlorophyll content. The photosynthetic parameters measured by the chlorophyll fluorescence, photochemical efficiency (F v/F m) of photosystem II, non-photochemical quenching, and the electron transfer rate, showed a differential decline in the senescing part of the leaves. The CO2 assimilation rate and the activity of PSI activity measured from whole senescing leaves remained relatively intact until 28 days of leaf age but declined sharply thereafter. Examination of the behaviors of the individual components in the photosynthetic complex showed that the components on the whole are decreased, but again showed differential decline during leaf senescence. Notably, D1, a PSII reaction center protein, was almost not present but PsaA/B, a PSI reaction center protein is still remained at the senescence stage. Taken together, our results indicate that the compositions and structures of the photosynthetic complexes are differentially utilized at different stages of leaf, but the most dramatic change was observed at the senescence stage, possibly to comply with the physiological states of the senescence process.
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Abbreviations
- BN-PAGE:
-
Blue-native polyacrylamide gel electrophoresis
- Chl:
-
Chlorophyll
- ETR:
-
Electron transport rate
- F v/F m :
-
Maximum photochemical efficiency of PSII for dark-adapted sample
- LHC:
-
Light-harvesting complex
- NPQ:
-
Non-photochemical quenching
- PAR:
-
Photosynthetically active radiation
- PS:
-
Photosystem
- RC:
-
Reaction center
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Acknowledgments
The authors thank Dr. Sunghyun Hong for providing critical feedback on this manuscript. This study was supported by the Research Center Program of IBS (Institute for Basic Science, No.CA1208) and the National Research Foundation of Korea (The National Honor Scientist Support Program, No.20100020417) funded by the Korea government (MEST) in Korea. SIA was supported by grants from the Russian Foundation for Basic Research and by the Molecular and Cell Biology Programs of the Russian Academy of Sciences. CHL was supported by a grant from the National Research Foundation of Korea (NRF), funded by MEST (No. 2012-0004968).
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11120_2013_9906_MOESM1_ESM.jpg
Supplementary material 1 (JPEG 137 kb). Suppl. Fig. 1 Light induction curve of ETR and NPQ during successive leaf ages under different intensities of PAR. a. ETR, electron transport rate, b. NPQ, non-photochemical quenching. PAR, photosynthetically active radiation. All measurements were carried out at room temperature. Each measurement was performed with five leaves. The means and standard errors (±SE) from three to five replicates are shown
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Nath, K., Phee, BK., Jeong, S. et al. Age-dependent changes in the functions and compositions of photosynthetic complexes in the thylakoid membranes of Arabidopsis thaliana . Photosynth Res 117, 547–556 (2013). https://doi.org/10.1007/s11120-013-9906-2
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DOI: https://doi.org/10.1007/s11120-013-9906-2