scholarly journals Evidence for Chloroplastic Succinate Dehydrogenase Participating in the Chloroplastic Respiratory and Photosynthetic Electron Transport Chains of Chlamydomonas reinhardtii

1989 ◽  
Vol 90 (3) ◽  
pp. 1084-1087 ◽  
Author(s):  
Kenneth O. Willeford ◽  
Zoltán Gombos ◽  
Martin Gibbs
Keyword(s):  
Electron Transport ◽  
Chlamydomonas Reinhardtii ◽  
Succinate Dehydrogenase ◽  
Photosynthetic Electron Transport ◽  
Electron Transport Chains

scholarly journals The Regulation of Photosynthetic Electron Transport during Nutrient Deprivation in Chlamydomonas reinhardtii

1998 ◽  
Vol 117 (1) ◽  
pp. 129-139 ◽  
Author(s):  
Dennis D. Wykoff ◽  
John P. Davies ◽  
Anastasios Melis ◽  
Arthur R. Grossman
Keyword(s):  
Electron Transport ◽  
Chlamydomonas Reinhardtii ◽  
Photosynthetic Electron Transport ◽  
Nutrient Deprivation

scholarly journals Characterization of Light-Enhanced Respiration in Cyanobacteria

2020 ◽  
Vol 22 (1) ◽  
pp. 342
Author(s):  
Ginga Shimakawa ◽  
Ayaka Kohara ◽  
Chikahiro Miyake
Keyword(s):  
Electron Transport ◽  
Redox Homeostasis ◽  
Photosynthetic Electron Transport ◽  
Co2 Assimilation ◽  
O2 Evolution ◽  
Eukaryotic Algae ◽  
Electron Transport Chains ◽  
Physiological Analysis ◽  
Photosynthetic Co2 Assimilation ◽  
And Function

In eukaryotic algae, respiratory O2 uptake is enhanced after illumination, which is called light-enhanced respiration (LER). It is likely stimulated by an increase in respiratory substrates produced during photosynthetic CO2 assimilation and function in keeping the metabolic and redox homeostasis in the light in eukaryotic cells, based on the interactions among the cytosol, chloroplasts, and mitochondria. Here, we first characterize LER in photosynthetic prokaryote cyanobacteria, in which respiration and photosynthesis share their metabolisms and electron transport chains in one cell. From the physiological analysis, the cyanobacterium Synechocystis sp. PCC 6803 performs LER, similar to eukaryotic algae, which shows a capacity comparable to the net photosynthetic O2 evolution rate. Although the respiratory and photosynthetic electron transports share the interchain, LER was uncoupled from photosynthetic electron transport. Mutant analyses demonstrated that LER is motivated by the substrates directly provided by photosynthetic CO2 assimilation, but not by glycogen. Further, the light-dependent activation of LER was observed even with exogenously added glucose, implying a regulatory mechanism for LER in addition to the substrate amounts. Finally, we discuss the physiological significance of the large capacity of LER in cyanobacteria and eukaryotic algae compared to those in plants that normally show less LER.

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