Abstract
The photosynthetic apparatus of Synechocystis sp. PCC 6714 cells grown chemoheterotrophically (dark with glucose as a carbon source) and photoautotrophically (light in a mineral medium) were compared. Dark-grown cells show a decrease in phycocyanin content and an even greater decrease in chlorophyll content with respect to light-grown cells. Analysis of fluorescence emission spectra at 77 K and at 20 °C, of dark- and light-grown cells, and of phycobilisomes isolated from both types of cells, indicated that in darkness the phycobiliproteins were assembled in functional phycobilisomes (PBS). The dark synthesized PBS, however, were unable to transfer their excitation energy to PS II chlorophyll. Upon illumination of dark-grown cells, recovery of photosynthetic activity, pigment content and energy transfer between PBS and PS II was achieved in 24–48 h according to various steps. For O2 evolution the initial step was independent of protein synthesis, but the later steps needed de novo synthesis. Concerning recovery of PBS to PS II energy transfer, light seems to be necessary, but neither PS II functioning nor de novo protein synthesis were required. Similarly, light, rather than functional PS II, was important for the recovery of an efficient energy transfer in nitrate-starved cells upon readdition of nitrate. In addition, it has been shown that normal phycobilisomes could accumulate in a Synechocystis sp. PCC 6803 mutant deficient in Photosystem II activity.
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Abbreviations
- APC:
-
allophycocyanin
- CAP:
-
chloroamphenicol
- Chl:
-
chlorophyll
- DCMU:
-
3(3,4-dichlorophenyl)-1,1-dimethylurea
- CP-47:
-
chlorophyll-binding Photosystem II protein of 47 kDa
- EF:
-
exoplasmic face
- PBS:
-
phycobilisome
- PC:
-
phycocyanin
- PS:
-
Photosystem
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Vernotte, C., Picaud, M., Kirilovsky, D. et al. Changes in the photosynthetic apparatus in the cyanobacterium Synechocystis sp. PCC 6714 following light-to-dark and dark-to-light transitions. Photosynth Res 32, 45–57 (1992). https://doi.org/10.1007/BF00028797
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DOI: https://doi.org/10.1007/BF00028797