Abstract
Nitrogen is an essential factor for normal plant and algal development. As a component of nucleic acids, proteins, and chlorophyll (Chl) molecules, it has a crucial role in the organization of a functioning photosynthetic apparatus. Our aim was to study the effects of nitrogen starvation in cultures of the unicellular green alga, Chlamydomonas reinhardtii, maintained on nitrogen-free, and then on nitrogen-containing medium. During the three-week-long degreening process, considerable changes were observed in the Chl content, the ratio of Chl-protein complexes, and photosynthetic activity of the cultures as well as in the ultrastructure of single chloroplasts. The regreening process was much faster then the degradation; total greening of the cells occurred within four days. The rate of regeneration depended on the nitrogen content. At least 50% of the normal nitrogen content of Tris-Acetate-Phosphate (TAP) medium was required in the medium for the complete regreening of the cells and regeneration of chloroplasts.
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Abbreviations
- Fv/Fm :
-
maximal quantum yield of PSII photochemistry
- Chl:
-
chlorophyll
- CP43 and CP47:
-
core complex proteins of PSII
- DG:
-
degreening process
- P680:
-
primary electron donor of PSII
- RG:
-
regreening process
- TAP:
-
Tris-Acetate-Phosphate
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Acknowledgements: A. Kósa is grateful for the Ferenc Deák Scholarship of the Hungarian Ministry of Education and Culture (DFÖ 0021/2009). This work was supported by Richter Centennial Foundation.
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Preininger, É., Kósa, A., Lőrincz, Z.S. et al. Structural and functional changes in the photosynthetic apparatus of Chlamydomonas reinhardtii during nitrogen deprivation and replenishment. Photosynthetica 53, 369–377 (2015). https://doi.org/10.1007/s11099-015-0129-y
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DOI: https://doi.org/10.1007/s11099-015-0129-y